Marchand Electronics Inc.

Transcription

1 Marchand Electronics Inc. Assembly Manual XM Tube Electronic Crossover

2 XM Tube Electronic Crossover. Assembly of Cabinet General The XM cabinet contains XM tube crossover networks and a PS power supply. Additionally the cabinet has level controls, power switch, sum switch and indicator lights on the front panel. The rear panel has the RCA signal connectors, line cord and fuse. The XM-KK kit contains the following parts: Parts List x ½ PS XM XM-FM T Cabinet front panel XM Cabinet adapter panel Cabinet Rear Panel Cabinet Shell Cabinet Top Rubber feet + scews Button head cap screw Power supply Kit Xover board Kit Frequency Modules Line Cord Toroidal Power Transformer with mounting hardware ex wrench / ex wrench / A bag with the following parts: RCA connector RED RCA connector BLACK Fuse older Fuse, A 0V Power entry connector Voltage selector switch / Threaded Standoff # x ½ button head cap screw # x ½ machine screw / * / Machine Screw / * ¼ Machine Screw Black # Solder Lug Nylon cable clamp. -0x/ Machine Screw # Locknut AT Level Control Attenuator 0K or Amber LED older for LED DPDT Rocker Switch Black Black Aluminum Knob ' / eat Shrink Tubing ' Black # hookup wire ' # hookup wire ' # hookup wire ' Orange # hookup wire ' Green # hookup wire ' Blue # hookup wire Assembly Instructions The front panel, rear panel and shell will be assembled separately and joined together at the end. First assemble the PS-K power supply and the two XM-K crossover boards according to the instructions provided. Assembly of Rear Panel The rear panel holds the RCA connectors and the power cord and the fuse holder. Install the RCA connectors in the holes input, high pass, low pass. The left channel has the connectors with the BLACK insulators. The right channel gets the RED insulators. Each 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 fuse holder in the panel. The white washer is installed on the outward side. Gently tighten the nut. Too much force will crack the housing. Install the Power entry connector using two /0 x / screws and # locknuts. Install the voltage selector switch using two /0 x / screws and # locknuts. Orient the selector switch so that when the selector is switched towards the fuse holder it shows V. Attach wires to the RCA connectors. Prepare pairs of wire by taking an length of red and brown wire and twisting together. Slip a / length of heat shrink tubing over the end of each wire at one side of the pair. Strip / of insulation off each wire. Solder the brown wire onto the solder lug of the connector. Solder the red wire into the center pin of the connector. Slip the heat shrink tubing over the solder joints. Shrink the tubing with a heat gun. If no heat gun is available use the heat of a soldering iron. Repeat this for all RCA connectors. The assembly of the rear panel is now complete. Put it aside until later. Assembly of Front Panel Install the 0K attenuators in the positions labeled level. Tighten the nuts carefully. One DPDT switch mounts in the position marked power and the other DPDT switch mounts in the position marked sum. There are holes left for the indicator LEDs. Do not install these LEDs yet at this time. Install wires to attenuators. Prepare 0 lengths of red, orange and brown wire. Strip / of insulation from each end. Solder one end of each wire to an attenuator. T=brown, W=red, B=orange. Twist the wires to form a -wire cable. repeat above step for all four attenuators. Install two blue 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.

3 Assembly of Shell Place the shell on a flat surface with the bottom down. The front of the shell is labeled as such. Place the front of the shell towards you. The XM crossover boards will be mounted in the holes marked at the right hand side of the chassis. Each board uses / standoffs and # -x/ screws. Install the standoffs in the holes using flathead - screws. Now mount the XM crossover boards on the standoffs. Install the PS at the holes marked, using four / standoffs. The side with the terminal blocks faces the transformer. Use star locking washers under the screws in the bottom shell. This is important. The starwashers will insure that the power supply is properly grouned. Mount the TO voltage regulator on the rear panel of the cabinet. Use a mica insulator between the regulator rear panel. The mica insulator should be coated with heat sink compound on both sides. Install the toroidal transformer to the left of the PS board with the mounting hardware included with the transformer. The wiring of the transformer to the PS board is shown in the manual that comes with the PS-K. The power wiring between the PS power supply board and the two XM crossover boards is shown in table. Prepare wire lengths of the proper length and color, strip / of insulation from each end, insert into the terminal block and fasten the screw. The power wires typically run from the PS to the left XM with one wire and then from the left XM to the right XM with another wire. Twisting the wires together will make for a nice appearance. Putting it all together The Signal Wiring for the rear panel connectors is shown in table. A good way to do this is to place the rear panel right next to the rear of the shell, but do not screw it on. This way it is easier to insert the wires into the terminal blocks. Note that the input signals are hooked up to both IN and IN of the XM crossover networks. Use a piece of red wire to make this jumper connection. When all connectors are wired up the rear panel can be fastened to the shell with the black - x / screws. The wiring for the front panel controls is shown in table. After connecting all four potentiometers and the sum switch the front panel can be screwed on. 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 table. 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. Now the AC power wiring will be installed. Install the fuse holder, line voltage switch and power entry connector on the rear panel and install a DPDT switch for the power on the front panel. Refer to the line power interconnect diagram for the wiring between these and the power transformer. Make sure the transformer wiring follows the colors indicated in the diagram. Use heat shrink tubing over the soldered connections where possible. Make sure to install the grounding wire from the power entry connector to the chassis. Use a solder lug and a short wire for this purpose. The solder lug can be installed under one of the screws that mounts the PS power supply board. Double check that the screws fastening the standoffs for the PS to the bottom shell have starwashers. This will insure proper grounding of the power supply and line cord. Install a A slow blow fuse in the fuse holder. 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 the XM. Make sure all AX tube are REMOVED from the XM crossover boards. 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 filament voltage by hooking up a voltmeter between the G and. terminals. The voltage should be between and volts. Check the positive and negative V outputs on the power supply. The voltahe should be about 0-0 Volt. UNPLUG the power cord before proceeding. Install the AX tubes into the XM boards. Install the frequency modules into the XM Boards. The Low pass modules plug into the left side connector of each XM board. The igh pass modules plug into the right side connector of each XM board.

4 Installation. The XM-AA is now ready for use. See the Users Guide for details on how to hook it up in your sound system. Rear Panel Power entry Rear Panel Fuse older Front Panel DPDT switch Grey L Wire to Case N Rear Panel Voltage selector Violet Blue Line power interconnect T

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6 XM Tube Electronic Crossover Board. Assembly Instructions. General The XM is an electronic crossover for use in high quality audio equipment. The basic board has two fourth order filters, one for the high pass and one for the low pass. 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. Parts List R R R R R R R R R R0 R R R R R R C C C C C C C C C C0 C C C RLY V V V V P P 0K 0K 0K 0K 0K 0K 0K 0K.00M.00M 0.0K 0.0K.00M.00M 0. uf,0v 0. uf,0v 0. uf,0v 0. uf,0v 0. uf,0v. uf, 0V. uf, 0V 0. uf,0v. uf, 0V. uf, 0V. uf, 0V. uf, 0V 0. uf,0v DPDT AXA AXA AXA AXA Connector Connector /W,% Metal Film /W,% Metal Film /W,% Metal Film /W,% Metal Film /W,% Metal Film /W,% Metal Film /W,% Metal Film /W,% Metal Film % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film % Metal Film Polypropylene Film Polypropylene Film Polypropylene Film Polypropylene Film Polypropylene Film Polyester Film Polyester Film Polypropylene Film Polyester Film Polyester Film Polyester Film Polyester Film Polypropylene Film Relay, V coil Dual Triode Dual Triode Dual Triode Dual Triode 0 position 0 position Quantity 0 Description 0K /W,% Metal Film 0.0K % Metal Film.00M % Metal Film 0. uf,0v Polypropylene Film. 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 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. Tube pin sockets: First install the pin-sockets for the four AXA vacuum tubes. These pin-scockets 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 /W resistors R..R (marked -Grey-Black-Yellow--), the.00m resistors (marked -Black-Black-Yellow-) R,R0,R,R and the 0.0K (marked -Black-Black---) resistors R, R into the board and solder. Edge connectors: Install the 0 position edge connectors at location 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 0 position unit by joining two -pos units and two -pos units. Make up two position units by joining pairs of position units. Install a position terminal block at the input (IN...), the 0 position terminal block at the output (OUT...) and the two position units next to R and R (...). Relay: Install the relay at location RLY. Capacitors: Install the 0. uf polypropylene capacitors (marked.k) at locations C..C, C and C. Install the.uf (marked K) at locations C,C,C..C. Tubes: Insert the AXA tubes in the sockets. Assembly is now complete. Please double check all parts for proper insertion and soldering. Insert frequency modules now or later. The following parts are supplied with each board kit:

7 Installation. The XM needs a dual +/- 0V power supply for the plate/cathode and a.v power supply for the filaments. A. V voltage is needed to activate the output relays. Inputs: Signal inputs are connected to the inputs IN and IN and the input located at the input side of the board. Outputs: The outputs are taken at OUT and OUT. Level controls: Level controls need to be connected also. There is one control for each channel. The level control should have a value of 0K. for best performance. Controls with a linear taper are preferred. Values up to 00K are satisfactory. There are two trimpots located on the XM circuit board. These can be used as level controls, or off-board controls can be used. If the on-board controls are used use contacts marked PT for the input of the control and contact marked PW as the wiper. The ground is already connected. Sum switch: The output of two channels can be summed (averaged) by using a SPST switch. Connect the switch between the two terminals marked SM of the channels to be summed. This is useful when using a common subwoofer. The switch is connected between the SM terminals of the low pass channels. Filament power: A. volt power supply should be connected between the F and F terminals. Best is a regulated DC supply, in order to avoid hum, but an AC supply can be used also. The supply should be near ground potential. For a DC supply this can be achieved by grounding one of the sides. For an AC supply it is best to use a center grounding scheme, in order to minimize hum. The current drawn is 00 ma. igh Voltage Supply: A dual (regulated) supply of +0V and -0V should be connected to the ++ and - - terminals and ground. The current drawn is ma. Relay Power: A voltage of V should be connected between the relay coil terminals RL and PL. The voltage can be taken from the filament power supply. Power Supply Sequencing There should be a delay of 0 seconds between applying power to the filaments and applying the +/0 voltages. Then there should be another second delay before applying power to the output relay. Circuit description The XM circuit board has two filters. Each filter can be low-pass or high-pass, depending on the frequency module. The filters are db/octave with the standard frequency modules, but other slopes can be realized by modifying the frequency modules. There are AXA dual triode tubes on the circuit board. Channel uses sections B of each tube and channel uses sections A. Please refer the circuit diagram for the following description. The input signal is applied at the terminal marked IN. Tube V is a cathode follower. It acts as a buffer for the input signal. The tube current is set by resistor R and the cathode supply voltage. For the values used, the tube current will be about. ma. The second and third stages (V and V) are the actual filter sections. The filter components are mounted on plug-in frequency modules. The frequency module determines the slope of the filter and if it is low-pass or high-pass. Each section is a second order Butterworth filter. The two sections together make for a fourth order constant voltage filter. The schematics show channel with a highpass frequency module and channel with a low pass frequency module. The output of the second filter is taken from the cathode of V with a.uf capacitor (C) at terminal OT. This capacitor prevents any DC component of the signal from appearing on the level control. An external level control can be connected between OT and GR, the input of the output buffer V. A linear potentiometer works best at this location. The output of the crossover is taken from the cathode of V with a. uf capacitor. This capacitor is made up of two.uf polyester film capacitors and one.uf polypropylene capacitor. The output of the crossover is shorted to ground with relay RLY when it is not in operation. A time delay activates the relay after warm-up and removes the short. This arrangement eliminates any turn-on transients at the output. The power supply sequencing circuit also releases the relay instantly when the AC power is turned off, thus eliminating any turn-off transients. See table for connecting power and signals to the XM

8 Frequency module Two frequency modules are used on each XM crossover board. The frequency module board is marked with components through 0. Table 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: Rx = 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 values shown in table are for the standard fourth order, db/oct filter. For third order alignment use the values in table, for second order alignment use table or, and for first order use table 0. 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.

9 PS Tube Power Supply. Assembly instructions for Circuit board. General 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. A relay driver is included for driving a signal relay that enables the outputs of the XM 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 R R R R0 R R R R R R R R R R0 R. Ohm 00 Ohm 00 Ohm 00 Ohm 00K.00K.0M 00K 00K.00 M 00 K.00 M.00K.00K.00K 00 Ohm 00 Ohm % Metal film resistor % Metal film resistor % Metal film resistor W power resistor % 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 R R R R 0 K 0 K 0 K 0 K 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 Diode,A Diode,A Diode,A Diode,A Diode,A Zener Diode,.V W Power resistor* W Power resistor* Diode,A Diode,A Diode,A Diode,A N-Channel MOSFET N-Channel MOSFET IC IC IC RLY L L LMK TO Regulator Comparator V Relay inductor inductor LM DPDT M M /W,% Metal Film /W,% Metal Film /W,% Metal Film /W,% Metal Film *NOTE: yes, these are indeed resisitors.

10 The following parts are supplied with each board kit:. Ohm % Metal film resistor 0K /W,% Metal Film 00 Ohm W Power Resistor 00 Ohm W Power Resistor 00 Ohm % Metal film resistor.00k % Metal film resistor 00K % Metal film resistor.00m % Metal film resistor.0m % Metal film resistor. uf,00v Polyester Film 0 uf,0v Aluminum Electrolytic 0,000 uf,v Aluminum Electrolytic 0 uf,v Non-Polar Al. Electrolytic ER0 Diode,A N Diode,A N Zener Diode,.V IRFI0 N-Channel MOSFET M inductor LMK TO Regulator LM Comparator DPDT V relay Bare ookup 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 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 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 black yellow brown 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 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 are. 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. 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. 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

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12 PS XM Left XM Right Color signal RLY RL RL Blue coil of V relay. RL RL Blue coil of V relay. F F Green tube filaments.v DC G F F Green tube filaments,neutral ground for power supply V plate voltage, +0V DC V Orange cathode voltage, -0V DC Table : Connections for controls and power Source XM Left XM Right Color signal Left In, center IN, IN Left input signal Left In, Lug Left input ground Right In, Center IN, IN Right input signal Right In, Lug Right input ground Left Out i, Center OUT Left igh Output signal Left Out i, Lug Left igh Output ground Right Out i, Center OUT Right igh Output signal Right Out i, Lug Right igh Output ground Left Out Lo, Center OUT Left Low Output signal Left Out Lo, Lug Left Low Output ground Right Out Lo, Center OUT Right Low Output signal Right Out Lo, Lug Right Low Output ground Table : Connections for rear panel signals

13 Source XM Left Left Low Level Control XM Right Color signal OT, Left side connect to top of control GR, Left side connect to wiper of control,left side Orange connect to ground of control Left igh Level Control OT, Right side connect to top of control GR, Right side connect to wiper of control,right side Orange connect to ground of control Right Low Level Control OT, Left side connect to top of control GR, Left side connect to wiper of control,left side Orange connect to ground of control Right igh Level Control OT, Right side connect to top of control GR, Right side connect to wiper of control,right side Orange connect to ground of control Sum Switch SM, Left Side Blue one wire of sum switch Blue the other wire of sum switch SM, Left Side Table : Connections for front panel controls Source PS Color signal Filament LED LED Green connect to cathode of LED. connect to anode of LED Plate LED LED Green connect to cathode of LED. connect to anode of LED Out LED LED Green connect to cathode of LED. connect to anode of LED Table : Connections for front panel LED indicators

14 Location Terminal channel signal input IN input IN input near R PT top of onboard control PW wiper of onboard control GR connect to wiper of control SM connect to sum switch OT connect to top of control connect to ground of control near R PT top of onboard control PW wiper of onboard control GR connect to wiper of control SM connect to sum switch OT connect to top of control connect to ground of control output OUT output ground for output cable RL coil of V relay RL coil of V relay F tube filaments.v 00mA F tube filaments,neutral OUT ground for power supply ++ plate voltage, +0V ma -- cathode voltage, -0V ma ground for input cable output Table : Connections for signals, controls and power on XM board

15 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 Table : component selection for frequency module for standard db/oct, Constant Voltage (Linkwitz-Riley) alignment. 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

16 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 J Table : 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 Table : component selection for frequency module for db/oct, Constant Voltage (Linkwitz-Riley) alignment.

17 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 0: component selection for frequency module for db/oct Terminal Block location Terminal ID Xformer CE Xformer CE/ 0 signal AC Black Orange 0 VAC transformer secondary, side AC Yellow Green 0 VAC transformer secondary, side COM, Orange Yellow, White V-- +0 VDC output V ground V++ +0 VDC output L Cathode of LED, relay indicator light L Cathode of LED, V indicator light L Cathode of LED, power indicator light FF green red VAC transformer secondary, side FF white black VAC transformer secondary, side. 0 VAC transformer center tap.v regulated filament supply, Anode of LED,,, relay coil G Ground for filament supply RELAY relay coil Table : Terminal block signals for PS power supply board

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20 L D V++ C0 VAC R R D C D no 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 L led

21 V++ Vb Cx IN Vb Cx R Vb Cx Rx Cx Rx SM Rx Rx R C0 OUT R OT PT 0 C R Vb C R PW GR R R C R V-- V++ Va Rx IN Va Rx Rx R0 Va Cx Rx Cx SM Cx C Cx R OUT R OT PT 0 C R Va C R PW GR R R C R V-OUT frequency module 0 no nc no nc RL OUT RL tube filaments F 0 v v v v F V-- V++ C C C C C XM tube electronic crossover (c) Marchand Electronics Inc.

22 Appendix Modifications for Balanced inputs and outputs Component Changes: R and R change to K, W R and R0 change to 0.0K %MF V changed to AT XLR RED YEL BRN WI can ORG BLK Jensen JT-P- IN OUT IN BRN ORG RED YEL XLR Rt Jensen JT--EMCF XM board OUT BRN ORG RED YEL XLR Rt Jensen JT--EMCF Rt =.0K %MF XM tube electronic crossover Optional balanced inputs & outputs

23 Module for 000z db LP filter + 00z notch filter Location Typical Value for 000z R K R K C 00pF R K C C R K 0 C0 C 00pF Cut trace here Jumper wire component selection for notch filter C 0 XM frequency module Modification for notch filter Rear of XM For different frequency, scale all capacitors inversely frequency. For example, C=C=C0=(000/F)*; where F is new frequency Spice simulator by Linear Technology with

24 Module for 000z db P filter + 000z notch filter Location Typical Value for 000z R 0K R.K C 00pF R K R C 0 R0.K C 00pF C Cut trace here C 0 C.K XM frequency module Modification for notch filter Rear of XM component selection for notch filter For different frequency, scale all capacitors inversely with frequency. For example, C=C=(000/F)*; where F is new frequency C & C are for notch frequency; C & C are for xover frequency Spice simulator by Linear Technology

25 Appendix Mono version Parts List PS XM XM-FM T Cabinet front panel XM-MONO Cabinet Adapter Plate Cabinet Rear Panel Cabinet Shell Cabinet Top Power supply Kit Xover board Kit Frequency Modules Line Cord Toroidal Power Transformer with mounting hardware A bag with the following parts: RCA connector RED Fuse older, D hole Fuse, A 0V Power entry connector Voltage selector switch 0 / Threaded Standoff / * / Panhead Machine Screw / * / Flathead Machine Screw / * / Panhead Machine Screw / * / Black Buttonhead Machine Screw # Solder Lug # Locknut -0x/ Machine Screw # Locknut 0K Level Control Potentiometer LED older for LED DPDT Toggle Switch Black Aluminum Knob ' / eat Shrink Tubing ' Black # hookup wire ' White # hookup wire ' Black # hookup wire ' # hookup wire ' # hookup wire ' Orange # hookup wire ' Green # hookup wire ' Blue # hookup wire