Marchand Electronics Inc.

Marchand Electronics Inc. Assembly Manual XM Tube Electronic Crossover Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

XM Tube Electronic Crossover. Assembly of Cabinet Parts List -way 0 ' ' ' ' ' ' ' ' -way 0 -way 0 0 PR XM XM AX XM-FM Assembly Instructions The front panel, rear panel and shell will be assembled separately and joined together at the end. First assemble the PR-K preamp board and the XM-K crossover boards according to the instructions provided. Assembly of Rear Panel Install the RCA connectors in the holes for input and output. The -way unit has connectors in all output positions. The -way unit does not use the center-hi Cabinet front panel XM Cabinet Rear Panel Cabinet Shell Cabinet Top Xover board Kit, single section Xover board Kit, single section Xover board Kit, dual section Dual Triode Tube Frequency Modules Fan RCA connector RED RCA connector BLACK XLR connector female Circular connector, male, pin, shell + pins / Threaded Standoff / x / Black Machine Screw / x / Buttonhead or flathead screw # Fiber Washer -0 x / Machine Screw -0 x Machine Screw # Locknut # Solder Lug Rubber bumper / x / PMS 0K Level Control Potentiometer DPDT Toggle Switch DPDT Slide Switch PDT Slide Switch Black Aluminum Knob Power resistor, 00 Ohm / eat Shrink Tubing Black # hookup wire # hookup wire # hookup wire Orange # hookup wire Yellow # hookup wire reen # hookup wire Blue # hookup wire outputs and the -way unit uses none of the center output positions. Put black hole-plugs in the unused positions. The left channel has the connectors with the BLACK insulators. The right channel gets the RED insulators. Each RCA connector has two insulators, one with a shoulder and the other is flat. Make sure the shoulder is inserted in the hole of the panel. Install the flat insulator on the other side of the panel. Install the solder lug and the nut. Tighten the nut well. Install the fan using the /0 screws and nuts. Install the DPDT switch near the fan. Install the PDT switch near the input connectors. Install the XLR connectors for the input, using /0 x / screws. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Install the -pin circular connector in the rear panel. Assembly of Front Panel Install the 0K potentiometers in the front panel. The way unit has potentiometers, the -way unit has and the -way unit has potentiometers. Tighten the nuts well. One DPDT switch mounts in the position marked sum. Figure Mounting of the circuit boards. The preamp board and filter boards are mounted in the chassis as shown in Figure. The PR preamp board is mounted on the right-hand side of the chassis (as seen from the front of the unit) and the XM crossover boards will be mounted in the remaining space. Important: Note which XM filter boards are single section and which ones are double section. Each board uses / standoffs and fiber washers and # -x/ screws. Install the standoffs in the holes using a - screw and fiber washer as shown in Figure. Insert a fiber washer under each standoff, between the standoff and the chassis. Now mount the XM crossover boards on the standoffs. Insert a fiber washer under each screw, between the head of the screw and the circuit board. Fiber Washer / x / screw Circuit board Fiber Washer / ex standoff / x / screw Chassis bottom Figure. Standoff and circuit board. Wiring it all together step for all potentiometers. Install two blue 0 wires to the sum mode switch. One wire goes to the bottom terminal of the switch and the other goes to the center terminal. The top terminal remains unused. Cover the solder joints with a / length of heat shrink tubing and shrink with heat gun. The connections from the front panel controls to the circuit boards are shown in and. The DC power wiring is shown in. Make the connections as shown between the circular power connector and the circuit boards. The best way to do this is to daisy-chain the wiring: run a wire first from the connector to the terminal block on the first board, then from there to the next board, and so on, visiting the circuit boards from left to right. Using a different color of wire for each power line as shown will make assembly easier. Connect the power to the fan on the rear panel to the filament power. Insert the slide DPDT switch in one of the power lines to the fan. Prepare a grounding assembly as shown in Figure using a piece of wire, the 00 Ohm power resistor and a solder lug. Install the solder lug under one of the nuts on the rear panel and connect the wire to one of the termonals on the pos terminal block of the PR. Wire to PR power ground Solder lug Resistor Figure The Signal Wiring for the INPUT for the rear panel connectors is shown in Figure. Note that the two DPDT switches shown in the figure are in fact halves of the single PDT switch. Twist the red/black/orange wires together as they run from the rear panel to the terminal blocks on the PR circuit board. Finally, the output of the preamp is to be connected to the inputs of the filter boards. See. The left inputs of all filter boards are connected together and connected to the left output of the preamp board. Similarly for the right channel. The pairs running between the boards should be twisted together. When installing the wires between the panels and the circuit boards it may be easier to remove the screws holding the panels in place and laying the panels next to the bottom of the chassis. Install wires to potentiometers. Prepare 0 lengths of red, orange and brown wire. Strip / of insulation from each end. Solder one end of each wire to a potentiometer, as shown in Figure. Note the color orientation. Use / of heat shrink tubing over each potentiometer terminal. Shrink with heat gun. Twist the wires to form a -wire cable. Repeat above Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

black orange RCA Installation. Slide Switch red red black RCA XLR PR I+ ND The XM-AA is now ready for use. See the Users uide for details on how to hook it up in your sound system red orange orange I- XLR Left Channel black orange RCA Slide Switch red red black RCA XLR I+ ND red orange orange I- XLR Right Channel Figure Signal wiring for the inputs The wiring is now complete. The power cable is made up of the conductor cable and the two circular connectors. One connector is male and the other female. We will now test the power supply. Double check proper grounding of the line cord by testing for continuity between the ground prong of the power cord and the shell of theps. Make sure all AX tube are REMOVED from the XM crossover boards. Connect the power cable between the PS and the XM chassis. Plug the cord in and turn on the power switch. The Filament indicator on the front panel should light up. After about 0 seconds the Plate indicator will light up and after another seconds the Out indicator will light up. Check the positive and negative V outputs on the power supply. The voltage should be about 0 Volt. Also check for positive V voltage on the P (plate) pins of the tube sockets. The C (cathode) pins of the tubes should have negative V. Connect the voltmeter to terminal. closest to terminals FF and ND. The reading should be approx.. Volts. Any reading between V and V is OK. The fan should be operational. Check the fan by switching the fan on/off with the fan switch. Now turn the power off! Install the AX tubes into the XM and PR boards. Install the frequency modules into the XM Boards. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Rear XM Filter XM Filter XM Filter Low Pass Single Section for -way Low Pass Single Section for -way Center Lo Double Section for -way Left Right Left Right XM Filter Low Pass Single Section for -way Center Double Section for -way PR Preamp igh Pass Single Section Center igh Double Section for -way Left Right Left Right Front Figure Circuit board layout Source XM Low Pass XM i Pass Color signal Left Low Level Control OT, Left side connect to top of control R, Left side connect to wiper of control ND,Left side Orange connect to ground of control Right Low Level Control OT, Right side connect to top of control R, Right side connect to wiper of control ND,Right side Orange connect to ground of control Left igh Level Control OT, Left side connect to top of control R, Left side connect to wiper of control ND,Left side Orange connect to ground of control Right igh Level Control OT, Right side connect to top of control R, Right side connect to wiper of control ND,Right side Orange connect to ground of control Sum Switch SM, Left Side Blue one wire of sum switch SM, Right Side Blue the other wire of sum switch Table : Connections for front panel controls, Low-pass and igh-pass Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Source XM Lo Center XM i Center Color signal Left Lo Center Control OT, Left side connect to top of control R, Left side connect to wiper of control ND,Left side Orange connect to ground of control Right Lo Center Control OT, Right side connect to top of control R, Right side connect to wiper of control ND,Right side Orange connect to ground of control Left i Center Control OT, Left side connect to top of control R, Left side connect to wiper of control ND,Left side Orange connect to ground of control Right i Center Control OT, Right side connect to top of control R, Right side connect to wiper of control ND,Right side Orange connect to ground of control Table : Connections for front panel controls, Center-Lo and Center-i PR XM board Connector Color signal R Pin coil of V relay R Pin coil of V relay F F Pin Orange tube filaments.v DC F F Pin Yellow tube filaments,neutral (near ++) (near ++) Pin reen ground for power supply ++ ++ Pin Blue plate voltage, +0V DC -- -- Pin Black cathode voltage, -0V DC Table Connections for controls and power Source XM Lo XM i Color signal Left Out i, Center O Left igh Output signal Left Out i, Lug Left igh Output ground Right Out i, Center O Right igh Output signal Right Out i, Lug Right igh Output ground Left Out Lo, Center O Left Low Output signal Left Out Lo, Lug Left Low Output ground Right Out Lo, Center O Right Low Output signal Right Out Lo, Lug Right Low Output ground Table Connections for rear panel signals, Low-pass and igh-pass Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Source XM XM Center Lo Center i Color signal Left Out Center i, Center O Left Center igh Output signal Left Out Center i, Lug Left Center igh Output ground Right Out Center i, Center O Right Center igh Output signal Right Out Center i, Lug Right Center igh Output ground Left Out Center Lo, Center O Left Center Low Output signal Left Out Center Lo, Lug Left Center Low Output ground Right Out Center Lo, Center O Right Center Low Output signal Right Out Center Lo, Lug Right Center Low Output ground Table Source Connections for rear panel signals, Center-lo and center-hi PR XM Color signal ALL Preamp Out Left, signal O IN Left Center igh Output signal Preamp Out Left, ground Left Center igh Output ground Preamp Out Right, signal O IN Right Center igh Output signal Preamp Out Right, ground Right Center igh Output ground Table Connections for rear signals between preamp and filter boards Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Frequency module Two or four frequency modules are used on each XM crossover board. The frequency module board is marked with components through 0. lists the components that need to be inserted at these locations for igh pass and for Low pass operation. The table also shows typical values for a crossover frequency of 000 z. Values for other frequencies can be calculated by scaling the resistor values. The values for the resistors are given by: = Rtable / Frequency(Kz) Use % resistors with values closest to the calculated value. The frequency module should normally be inserted with the components facing outwards, away from the tubes. Insertion in the other orientation is electrically OK, but there may not be enough clearance that way. XMFM Frequency module The Low pass and igh pass sections take two frequency modules each. On the bandpass sections for center, center-lo and center-hi, there are four frequency modules. The modules on each bandpass board must be selected so that the lo-pass module has a frequency that is higher than the hi-pass module. The values shown in are for the standard fourth order, db/oct filter. For third order alignment use the values in, for second order alignment use or, and for first order use. The constant voltage (Linkwitz-Riley) alignment has a frequency response that is db down at the crossover frequency. The other alignments are db down at the crossover frequency. The constant voltage alignment is generally preferred for the even order filters because the sum of the output voltage on the high and low pass outputs is constant for all frequencies. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Location igh Pass Typical Value for 000z Low Pass Typical Value for 000z C R.0K R.K C R.K C C R.0K R.K C C R.0K R.K C R.K C C R.0K 0 R0.K C0 component selection for frequency module for standard db/oct, Constant Voltage (Linkwitz-Riley) alignment. Table Location igh Pass Typical Value for 000z Low Pass Typical Value for 000z J J C R.K R.K C C R.K R.K C + R.K C + C R.K 0 R0.K C0 Table component selection for frequency module for db/oct, Butterworth Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Location igh Pass Typical Value for 000z Low Pass Typical Value for 000z J J J C R.0K R.K C R.K C C R.0K 0 R0.K C0 Table J component selection for frequency module for db/oct, Butterworth Location igh Pass Typical Value for 000z Low Pass Typical Value for 000z J J C R.K R.K C J J C R.K 0 R0.K C0 component selection for frequency module for db/oct, Constant Voltage (Linkwitz-Riley) alignment. Table 0 Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com 0

Location igh Pass Typical Value for 000z Low Pass Typical Value for 000z J J C R.K R.K C J J J 0 J Table component selection for frequency module for db/oct Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

XM Tube Electronic Crossover Filter Board. Assembly Instructions. eneral The XM is an electronic crossover for use in high quality audio equipment. The basic board has two pair of fourth order filters, one for the left channel and one for the right channel. The cutoff frequency is set with one frequency module for each channel. The wiring of the frequency module sets if it is highpass or low pass and the frequency. The double section filter board is a -th order bandpass design. Two -th order sections are in series, one for the high pass and one for the low pass. The single section filter board has only a single section in each channel, to be used for either high pass or low pass. The single section board is the same as the dual section board, except that the board is only partially populated. Parts List R* R* R R R R R R* R* R0 R R R R C C C C C C C C RLY V* V* V V V P* P P* P P P P P P 0K 0K 0K 0K 0K.K.00M 0K 0K 0K 0K 0K.K.00M 0. uf,0v. uf, 0V. uf, 0V. uf, 0V 0. uf,0v. uf, 0V. uf, 0V. uf, 0V DPDT AXA AXA AXA AXA AXA Connector Connector Connector Connector Term. Block Term. Block Term. Block Term. Block Term. Block /W, % Metal Film /W, % Metal Film /W, % Metal Film /W, % Metal Film /W, % Metal Film % Metal Film % Metal Film /W, % Metal Film /W, % Metal Film /W, % Metal Film /W, % Metal Film /W, % Metal Film % Metal Film % Metal Film Polyester Film Polyester Film Polyester Film Polyester Film Polyester Film Polyester Film Relay, V coil Dual Triode Dual Triode Dual Triode Dual Triode Dual Triode 0 position 0 position 0 position 0 position position position 0 position position position Parts marked with * are NOT used in the single section filter board, only in the double section filter board. The following parts are supplied with each board kit: Quantity 0() () () 0(0) Description 0K /W, % Metal Film.K % Metal Film.00M % Metal Film 0. uf,0v. uf, 0V Polyester Film DPDT Relay, V coil AXA Dual Triode Connector 0 position Pin-socket Pos terminal block Pos terminal block XM Circuit board Jumper wire, insulated Part count in () is for the single section board. Assembly Instructions Most parts are installed in the usual way. Insert the part at the location on the circuit board as indicated by the silk screen identification and solder on the solder side of the board. Please note that for the single section boards the parts marked with * are. Tube pin sockets: First install the pin-sockets for the four AXA vacuum tubes. These pin-sockets are inserted into the circuit board from the top (side with lettering) and soldered from the bottom. Make sure that all pin-sockets are inserted fully before soldering. A good way to insure this is use a tube as a guide. Insert the tube into the socket pins before soldering. This will hold the socket pins exactly where they should be. Make sure all pin-sockets are fully seated. Then solder the pin-sockets into the circuit board. Be careful not to get any solder inside the socket pins. Resistors: Insert the big power resistors R..R, R..R (marked -rey-yellow--old), the.00m resistors (marked -Black-Black-Yellow-) R,R and the.k (marked -YellowWhite---) resistors R, R into the board and solder.. Edge connectors: Install the 0 position edge connectors at location P, P, P and P. These connectors hold the frequency modules. Terminal Blocks: The terminal blocks are supplied in units of two and three. Make up a position unit by joining four -pos units. Make up two position units by joining pairs of -position units. Install two position terminal blocks at the inputs (IN...), the position terminal block at the output and the two position units next to R and R (N...). Relay: Install the relay at location RLY. Capacitors: Install the 0. uf polypropylene capacitors (marked.k) at locations C and C. Install the.uf (marked K) at locations C, C, C, C, C, C. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Tubes: Insert the AXA tubes in the sockets. Jumper wires: For the singles section boards only (see Figure ) install a jumper between pin (second pin from the edge of the board) to pin of P and P. Assembly is now complete. Please double check all parts for proper insertion and soldering. Insert frequency modules now or later. Figure low-pass or hi-pass board Figure Bandpass board Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

PR Tube Electronic Crossover Preamp Board. Assembly Instructions. eneral Parts List R R R R R R R R R R0 R R R R R R R R R R0 R R R R R R R.00M.00M.00M.00M.K.K 0K 0K.K.00M 0K.00M.00M.00M.00M.K.K 0K 0K.K.00M 0K.K % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film /W, % Metal Film /W, % Metal Film C C C Ca Cb C C C Ca Cb C C0 C C C C V V V P P P 0. uf,0v 0. uf,0v 0. uf,0v jumper 0. uf,0v 0. uf,0v 0. uf,0v jumper 0. uf,0v 0. uf,0v 0. uf,0v 0 uf,0v 0 uf,0v 0 uf,0v AXA AXA AXA Term. Block Term. Block Term. Block % Metal Film % Metal Film /W, % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film /W, % Metal Film /W, % Metal Film The following parts are supplied with each board kit: Quantity 0 0 Description.K W Power Resistor.K % Metal Film.K % Metal Film 0K /W, % Metal Film.00M % Metal Film 0. uf,0v 0 uf,0v Electrolytic Capacitor AXA Dual Triode Pin-socket Pos terminal block Pos terminal block Jumper wire, insulated Assembly Instructions Most parts are installed in the usual way. Insert the part at the location on the circuit board as indicated by the silk screen identification and solder on the solder side of the board. % Metal Film % Metal Film /W, % Metal Film W Power Resistor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Dual Triode Dual Triode Dual Triode position position position Figure Tube pin sockets: First install the pin-sockets for the three tubes. Make sure the pin sockets are inserted all the way and are straight. Resistors: Install all resistors by inserting from the component side and soldering on the solder side. Trim the leads. Terminal Blocks: The terminal blocks are supplied in Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

units of two and three. Make up a position unit by joining one -pos units and two -pos units. Install the terminal blocks as shown on the circuit board. Capacitors: Install the 0. uf polypropylene capacitors (marked.k) Install the 0uF aluminum electrolytics The orientation of these three electrolytics is important. See Figure Note that the orientation of all capacitors is the same. Tubes: Do not insert the tubes at this time.! The AXA tubes will be inserted in the sockets after the board is mounted in the chassis. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

PS Tube Power Supply. Assembly Instructions. eneral The PS is a power supply for the XM electronic crossover network. It has a dual +/- 0 VDC high voltage supply and two.vdc regulated filament supplies. The supply has a heavy duty toroidal power transformer with a dual 0V/ 0V line input. The supply is specifically designed for powering the XM electronic crossover network. The XM has a total of (max) AX tubes. The supply can also be used for other purposes. A relay driver is included for driving a signal relay that enables the outputs of the equipment to be powered. Drivers for Light Emitting Diodes are provided that can drive LED Indicator lights. Power Supply Sequencing The power supply sequencing has a dual purpose. The tubes are protected from power turn on and turn off transients by delayed application of anode voltage. The time delay relay driver enables the delayed turnon of the output. The output thus becomes active after the tubes are warmed up! After the power to the PS is turned on the.v filament power will become active immediately, but the V plate supply is not active yet. This prevents damage to the tube cathodes caused by hot spots. After a 0 S delay the V power is turned on. The internal voltages in the tube circuits take some time to stabilize. After another S delay the output relay will be activated. At each stage in the sequence the LED indicators will indicate the state of the power supply. When the power supply is turned off the output relay will be deactivated immediately and the V supply will be turned off. Parts list for circuit board R R R R R R. Ohm 00 Ohm 00 Ohm 00 Ohm % Metal film resistor % Metal film resistor % Metal film resistor W power resistor R R R R0 R R R R R R R R R R0 R R R R R 00K.00K.0M 00K 00K.00 M 00 K.00 M.00K.00K.00K 00 Ohm 00 Ohm C C C C C C C C C C0 C 0,000 uf,v Aluminum Electrolytic 0 uf,v Non-Polar Al. Electrolytic 0 uf,v Non-Polar Al. Electrolytic. uf,00v Polyester Film 0uF,0V Aluminum Electrolytic 0uF,0V Aluminum Electrolytic 0uF,0V Aluminum Electrolytic 0uF,0V Aluminum Electrolytic 0uF,0V Aluminum Electrolytic 0uF,0V Aluminum Electrolytic D D D D D D D D D D0 D D Q Q ER0 ER0 ER0 ER0 N N 0 K 0 K N N N N IRFI0 IRFI0 0 K 0 K 0 K 0 K % Metal film resistor % Metal film resistor % Metal film resistor % Metal film resistor % Metal film resistor % Metal film resistor % Metal film resistor % Metal film resistor % Metal Film % Metal Film % Metal Film W Power resistor W Power resistor /W, % Metal Film /W, % Metal Film /W, % Metal Film /W, % Metal Film Diode,A Diode,A Diode,A Diode,A Diode,A Zener Diode,.V /W, % Metal Film* /W, % Metal Film* Diode,A Diode,A Diode,A Diode,A N-Channel MOSFET N-Channel MOSFET Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

IC IC IC RLY L L LMK TO Regulator Comparator V Relay inductor inductor LM DPDT M M *NOTE: yes, these are indeed resisitors. The following parts are supplied with each board kit: Quantity Description. Ohm 0K 00 Ohm 00 Ohm 00 Ohm.00K 00K.00M.0M. uf,00v 0 uf,0v 0,000 uf,v 0 uf,v ER0 N N IRFI0 M LMK LM DPDT Bare ookup wire red, brown, orange hookup wire pin DIP Socket Pos terminal block Pos terminal block TO mounting hardware Socket Mica washer each # x ½ Self tapping screw Tube of heat sink compound PS Circuit board / x / machine screw / kepsnut # flat washer % Metal film resistor W Power Resistor W Power Resistor W Power Resistor % Metal film resistor % Metal film resistor % Metal film resistor % Metal Film % Metal Film Polyester Film Aluminum Electrolytic Aluminum Electrolytic Non-Polar Al. Electrolytic Diode,A Diode,A Zener Diode,.V N-Channel MOSFET inductor TO Regulator Comparator V relay Parts List for Cabinet PS T Cabinet front panel PS Cabinet Rear Panel Cabinet Shell Cabinet Top Power supply Kit Line Cord Toroidal Power Transformer CE/ A bag with the following parts: Pin Circular Connector, Female Female pin Fuse older Fuse,. A 0V SLOW-BLOW Rubber bumper / * / Machine screw Power entry connector Voltage selector switch / Threaded standoff / * / Black machine screw / x / Buttonhead or flathead screw # Solder Lug -0x/ Machine Screw # Locknut LED older for LED DPDT Rocker switch ' / eat Shrink Tubing ' White igh Voltage # hookup wire ' Black igh Voltage # hookup wire ' rn/yel igh Voltage # hookup wire ' Black # hookup wire ' # hookup wire ' # hookup wire ' Orange # hookup wire ' Yellow # hookup wire ' reen # hookup wire ' Blue # hookup wire Cable Assembly. Pin Circular Connector, Female Female pin Pin Circular Connector, Male Male pin Conductor cable Assembly Instructions for the circuit board Most parts are installed in the usual way. Insert each part at the location on the circuit board as indicated by the silk screen identification and solder on the solder side of the board. Jumpers: Two jumper wires need to be installed. They are indicated with a white line running between two holes in the circuit board. One is located near R and the other is near C. Resistors: The 0 big W power resistors and remaining /W metal film resistors are mounted onto the circuit board as indicated. The resistors are color coded as follows: 00Ohm,W brown black black gold 0K,W brown grey yellow gold 00 Ohm brown black black black brown Ohm red orange violet black brown.00k brown black black brown brown 0.0K brown black black red brown 00K brown black black orange brown.00m brown black black yellow brown.0m red red black yellow brown Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Diodes: Install the N rectifier diodes, ER0 rectifier diodes and the N zener diode as indicated. Make sure the band on the diode that indicates the cathode matches the white band on the identification. Some diodes have a black body and white band (N, ER0) and some have a white body with black band (N usually). It is very important that the orientation is done correctly. IMPORTANT NOTE: Mount D, D, D and D so there is a 0. to 0. gap between the diodes the circuit board. This will improve the cooling of the diodes. Note that D and D use resistors. Small Capacitors: Install the 0.uF stacked film capacitor (marked ) at location C. Install the 0uF non-polar capacitors at location C and C. These non-polar aluminum electrolytic capacitors can be oriented either way. Just ignore the polarity markings on the circuit board. IC: Use a piece of twisted conductor wire to connect the TO socket to the circuit board at location marked IC. Note the markings B and E near the terminals on the socket. The C terminal is the mounting screw. Use brown for C (case), red for B and orange for E. Insert the wires into the -position terminal block marked with B, C and E TO Socket Terminal block E(orange) E C(brown) C B(red) B Connections for IC Terminal Blocks: The terminal blocks are supplied in units of two and three. Make up a position unit by joining -pos units and -pos unit. Also make up a position unit using -pos units and one -pos unit. Install the terminal blocks as indicated at one of the long sides of the circuit board. Orient so that the wire entry is at the edge of the board. Large Electrolytic Capacitors: Install the large electrolytic capacitors C,,,,,0, as indicated on the circuit board. Make sure the plus and minus side are oriented correctly. The plus side is marked on the circuit board (+). The white band on the capacitors indicates the minus (-) side. IC socket: install a pin IC socket at location IC. Note the orientation. Pin of the socket is nearest R0. Insert the LM voltage comparator into the socket. Make sure the pin orientation is correct. Relay: Install the relay RLY Inductors: Install the two large inductors using # screw and locknut. Place a flat washer between the inductor and the circuit board on each mounting screw. This will prevent warping of the circuit board. Trim and insert the leads into the solder pads near the inductors. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Assembly of the cabinet. Transformer. Mount the transformer using the dish mounting kit onto the base of the chassis, as shown in Figure Bolt Nut Metal Plate Rubber washer Rubber washer Transformer Chassis bottom Figure Mounting of the toroidal transformer. Install the power entry connector, fuse holder and voltage selector switch on the rear panel of the PS. Notice the orientation of the voltage selector switch. The 0V marking should be to the right (as seen from the back of the unit). Install the DPDT rocker switch for the power on the front panel of the PS Wire the primaries of the transformer as shown in Figure 0 and Figure Rear Panel Power entry L Rear Panel Fuse older BLACK BLACK Wire to case REEN/ YELLOW Front Panel DPST rocker switch ray RED BLACK WITE N WITE Violet Blue Rear Panel Voltage selector transformer leads T Figure 0 Transformer wiring Figure Install the PS circuit board in the holes provided using the ½ standoffs and # screws. The blue terminal blocks are oriented to the left of the unit. Note that the rocker switch has two pairs of contacts; one pair is closer together than the other. Use the pair that is cose together for the wires that go to the transformer. Use high voltage (thick insulation) black and white # hookup wire to make the connections between the power entry connector, the power switch on the front panel and the power selector switch on the rear panel and the fuse holder. Install heat shrink tubing over all junctions. Use wire colors as shown in Figure 0. Make sure to securely install the grounding wire between the ground terminal on the power entry connector and the chassis. Solder a piece of green/yellow hookup wire to one of the solder lugs provided. Solder the free end of the wire to the ground terminal and secure the solder lug to the chassis with one of the / screws holding the rear panel. Set the voltage selector switch to the proper voltage before proceeding.install the TO power transistor onto the rear panel of the cabinet using the socket and the mica insulator. Be sure to apply heat sink compound to BOT sides of the mica insulator. The mica insulator is placed between the transistor and the panel. The socket goes on the inside of the rear panel. Wire the secondaries of the two transformers as shown in. Installation of the LED indicators. Identify which end of each LED is the cathode (negative) lead. The LED has a flat on its side next to this lead. Trim both leads to about /. Using / of heat shrink tubing, connect one end of a green wire to the cathode of each LED. slide the tubing over the solder joint, against the LED and shrink with a heat gun. Using / of heat shrink tubing, solder one end of a red wire to the remaining lead of each LED (anode). Twist the free ends of the red wires together and solder to a red wire. Use / of heat shrink tubing to cover this -way split. Install the other end of the red wire to the terminal marked. on the PS board. Connect the green wires to the PS as shown in. Install the LED indicators into the front panel. First insert the black grommet through the hole in the front panel from the outside. Then insert the LED into the grommet from the inside. The grommet snaps around the base of the LED and holds it in place. Install the pin circular connector on the rear panel. Wire the connector pins to the terminal block of the PS as shown in. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com 0

Install IC, the TO voltage regulator, on the rear panel of the case. The voltage regulator in mounted on the outside of the unit and plugs into the socket that is on the other side of the panel. Use the insulating wafer between the regulator and the rear panel. Make sure to apply a coating of heatsink compound on both sides of the insulator. Fasten with the two # sheet metal screws. Terminal Block location Terminal signal AC Transformer 0V secondary, side, Orange AC Transformer 0V secondary, side, reen COM Transformer 0V center tap, Yellow, White FF Transformer V secondary, side, Black FF Transformer V secondary, side, Table Terminal block signals for transformer CE/ Terminal Block location Terminal signal L Cathode of LED, relay indicator light L Cathode of LED, V indicator light L Cathode of LED, power indicator light. Anode of LED,, Table Terminal block signals for front panel LED PS board Connector Wire Color signal RLY Pin coil of V relay. Pin coil of V relay. Pin Orange tube filaments.v DC ND near. Pin Yellow tube filaments,neutral ND near v++ Pin reen ground for power supply V+ Pin Blue plate voltage, +0V DC V- Pin Black cathode voltage, -0V DC Table Wiring for circular connector, female type Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

L D V++ C0 VAC R D C R no D C nc R RLY CT no nc D0 L VAC R V-C D R D C R T in out g R R D +.V C IC D D FF IC R FF R L C C D R relay L D R L R0 R D + - IC C R + - L L + - L R led Q IC L R C R R L led Q R PS Tube power supply (c) Marchand Electronics Inc. R IC L led L

V++ R R C V Va C IN+ C INCa R R R R R OUT R Cb R0 R R V-- V++ R R V Va IN+ INCa R R R R R OUT R0 Cb R R R V-- V-- V-C C0 V++ C R C V++ C C PR tube electronic crossover (c) Marchand Electronics Inc.

Va IN V++ Va SM Va 0 Va Va C OT 0 R C R R R R R IN V++ Vb 0 SM Vb C OT 0 R C R R R R Vb Vb C R0 front V-- Vb OUT C R OUT C R C R R front V-OUT frequency module 0 no nc no nc RL OUT RL tube filaments F 0 v v v v v F V-- V++ C C XM tube electronic crossover (c) Marchand Electronics Inc. Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com

Appendix Modifications for Balanced inputs and outputs Component Changes: R and R0 change to K, W V changed to AT OUT ND BRN OR RED YEL XLR Rt Jensen JT--EMCF XM board OUT ND BRN OR RED YEL XLR Rt Jensen JT--EMCF Rt =.0K %MF XM tube electronic crossover Optional balanced inputs & outputs Marchand Electronics Inc PO Box 0,Rochester NY () 0 www.marchandelec.com