INSTRUCTIONS FOR ASSEMBLY AND OPERATION
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1 diytube stereo 0 driver board INSTRUCTIONS FOR ASSEMBLY AND OPERATION Price $0.00
2 Important Note: The phase is swapped on the diytube ST0 from the orginal design. Be sure to hook up the drive lines (at J, J, J and J) per the schematic. They will criss-cross like an 'X' as they hookup to the EL socket. This allows the proper phase for negative feedback; otherwise oscillation will occur.
3 diytube ST0 Driver Assembly Instructions Stock: The diytube ST0 driver has a dual silkscreen design, which permits mounting of all components except the tube sockets on either side. For typical ST0 construction, all the components will be placed on the socket side, also the top side. This side has silkscreen saying PUT SOCKET ON THIS SIDE. Custom: For custom chassis, the components could be placed on the underside, identified by the large diytube silkscreen. Sockets and ½ board standoffs would be on the top side. The socket holes should be approximately diameter with between centers. Dims in Mils (origin lower left) Sockets Mounting Holes 0, 6 0, 0, 6 0, 0, 6 0, 0, ) On the top side of the board, where it says PUT SOCKET ON THIS SIDE, insert 9-pin PC socket. Fully insert the socket and solder pins, &. Using a 9-pin tube (junkbox variety is handy), test all three sockets for ease of insertion. Also straighten the sockets at this point to where it is symmetrical and pleasing to the eye. Then solder the rest of the socket legs. ) Stuff board with all through-hole resistors. Cross-reference the part with the parts list and check off the resistor once it is placed. Bend the leads of the resistor so that the part identifier markings are clearly visible. Once inserted, fold the leads back to hold the part in place. You can easily stuff the board before soldering them in place, which permits easy correction for misplaced components. ) Solder all the stuffed resistors. Then gently pull back the excess lead straight out from the board with pair of small pliers. With a pair of cutters, trim close to the board, but do not cut into the solder joint itself. ) Carefully remove the current sources from the static packaging. Be sure to align the part with the TO-9 silkscreen at Q and Q. The silkscreen is flipped depending on the side you use, but notice how pin always goes in the same location, the square pad. Solder carefully and trim excess. Tip: You can touch your iron to the ground at J9 first to lower chance of ESD damage. ) Stuff and solder the four silver mica capacitors. Try to have the part identifier facing out so that it can easily be read and so the board will be symmetrical. Also, leave some space (at least.00 ) between the part and board for a good solder joint. These can be subbed with alternate manufacturers, but the values are fairly critical in the stock ST0. 6) When stuffing your six coupling caps, you will probably need to use pliers to re-bend the leads for optimal placing. Just be careful to not damage the meniscus of the capacitor. Once again, the values have been determined through much testing and should not be changed. 00V rated capacitors are OK for use on a stock ST0 with AR. TIP If using Auricaps, mount with the black lead towards the center of the board on C thru C0. For C & C mount with the black lead on the pad nearest pins and 9 on V respectively.
4 diytube ST0 Driver Rev B January, 006 Tip: Put a dot in the checkbox if you have the part already as a quick reference when ordering parts. X out the checkbox when you have installed the part on the PCB. Item QTY Reference Part Mouser Part Unit Cost R,R,R,R K, /W -RN60D-F-.0K 0. R,R K, /W -RN60D-F-K 0. R,R6 00, /W -RN60D-F R9,R0.K, /W -RN60D-F-.K 0. R,R 00K, /W -RN6D-F-00K 0. R,R.6K, /W -RN60D-F-.6K 0. R,R6,R,R M, /W -RND-F-M 0.6 R,R, /W -RND-F- 0.6 R9,R0,R,R K, W -K 0.9 R,R,R,R6 0K, /W -RN60D-F-0K 0. R9,R0 00K Pot -T9YB-00K.0 C,C 0.uF,600V -P600V0.. C,C 0pF 9--00V0 0. C,C6 0pF 9--00V0.0 C,C,C9,C0 0.0uF,600V -P600V Q,Q LMZ -LMZ 0.6 Wire Labels 6-PCM Wire Red TFE
5 C.0uF J J Ground J Left Channel Input V AU a'' 6 a R0 K, W J0 0VDC from B R 0K EL Left Front NF Left J J R K R6 00 R K R0.K C 0pF 6.A 6.B 9 h ht 6.A h'' C 0pF k'' k g'' g R K C.uF V AX a'' a 6 C R.6K C6 0pF R 00K R 00K R6 M Q LM J9 00VDC from A R g'' k'' 6.A h J ht 9 h'' J 6.B J- EL Left Rear J- EL Left Front J- Left 6.VAC (AU) J- Left 6.VAC (AU) J6- Left Bias Wiper J- Left Channel Input J- Left Channel Ground J9- Star Ground J0- Right Channel Ground J- Left Negative Feedback g k R K, W J- Right Negative Feedback J- Right 6.VAC (AU) J6- Right 6.VAC (AU) J- Right Channel Input J9-00VDC from A J0-0VDC from B J- Right Bias Wiper J- EL Right Rear J- EL Right Front Not Used: J, J, J, J 0VDC C0 C.0uF.0uF R MEG R0 00K R6 0K diytube ST0 Driver Board J6 Left Bias Wiper J EL Left Rear J NF Right R9.K.uF R EL Right Front R 00 R K R K V AU a'' 6 a R9 K, W 0K R K J0 Ground J Right Channel Input R.6K C 0pF R M Q LM R g'' g k'' k h 9 ht h'' J J6 R K,W 0VDC C9.0uF R MEG R9 00K R 0K J Right Bias Wiper J J9 Star Ground EL Right Rear
6 Note: Set bias using pins & of preamp socket referenced to ground at pins &. Set each to 00mV using left pot on amp. Balance with R0 on driver. to J EL Left Front K EL 0 Dynaco A-0 blue yellow green orange to J NF Left 6 ohm ohm 6 Left Preamp Socket VDC from C red brown ohm EL Left Rear to J K 0 grn-wht blue-wht black COM Note: Set bias using pins & of preamp socket referenced to ground at pins &. Set each to 00mV using right pot on amp. Balance with R9 on driver. diytube ST0 Driver Board to J K EL Right Front EL EL 0 Dynaco A-0 blue yellow green orange to J NF Right 6 ohm ohm 6 Right Preamp Socket VDC from C red brown ohm EL Right Rear to J K 0 grn-wht blue-wht black COM EL
7 to J6 0K 0K WW pot, left 0K WW pot, right to J + uf 00V 0K + uf 00V to J diytube ST0 Driver Board Left Side EL's.0uF green grn-yel to J green Dynaco PA-060 to J9 K,W + A0uF 00V to J0 6.K,W + B0uF 00V to A0s C- Choke + C0uF 00V + D0uF 00V GZ/AR 6 red red-blk red-yel black black on/off switch 0VAC red A slo blo white Dynaco Multi-Cap Legend A - 00VDC B - 0VDC C - VDC D - VDC Towards Rear of Amp C B D A to J to J6.0uF Right Side EL's white brown brn-yel brown Towards Front of Amp
8 Biasing Instructions: Note: Always use test loads on your speaker terminals, e.g. two ohm power resistors. Be sure to have the RCA inputs loaded or shorted. The first steps make sure your bias supply is working, is semi-balanced, and won't cause a melt down on first power up. Maintenance biasing can go directly to step #. ) Remove your AR and power the amp. The bias voltage will appear immediately at J6 and J on the diytube PCB. Adjust the wire-wound pots on the ST0 chassis so that these voltages go as negative as possible (eg -VDC), but adjust to have the voltage the same on both test points. You can use the preamp socket pins or as your DMM ground. ) Turn the unit off. Replace your AR rectifier. Turn on unit. ) Because adjusting one side usually changes the bias on the other side, you will now start ping-ponging between the sides adjusting the wire wound pot and measuring one of the bias points on that side unit you near 00mV. ) Now that you are around 00mV on all the tubes, stick your DMM probes in pins & of the preamp socket. You are measuring the small voltage difference between the biasing of the EL pair. Now adjust the respective balance pot (R9 or R0, depending on which side you are adjusting) until the voltage you read is zero or near zero difference. You might end up changing the scale of your DMM to the 00mV region. Do on both sides. ) Now repeat step #, but adjust to 00mV (00mV drop across the 0 ohm resistor is 0mA idle current) using the Dynaco wire-wound pots. 6) Now repeat step # for push pull perfection.
9 VOLTAGE CHART DC measurements (unless noted) Shorted input, no signal All measurements +/-% V AX V,V AU 90V V 0V 0V.V V 6.VAC 6.VAC 6.VAC 6.VAC 6 90V 6 V 0V 0V.V V 9 6.VAC 9 6.VAC V-V EL 00mV 6.VAC V V -V 6 -V 6.VAC 00mV J -V J -V J 6.VAC J 6.VAC J6 -V J 0V J 0V J9 0V J0 0V J 0V V GZ/AR 0V V 0V 66VAC 0V 6 66VAC 0V V J 0V J 6.VAC J6 6.VAC J 0V J9 00V J0 0V J -V J -V J -V Not Used: J,J,J & J MultiCap Lugs A B C D 00V 0V V V
10 RESISTANCE CHART Take measurements when unit is OFF and power supply caps are drained [ ] bracketed numbers are in-circuit values Consider readings >0 meg to be open All measurements +/-% V AX V,V AU open open K K.K open open open open open 6 open 6 open K less than ohm.k open 9 open 9 open V-V EL 0 ohms open xxx xxx xxx 6 xxx open 0 ohms J. meg J. meg J open J open J6. meg [K] J K J less than ohm J9 less than ohm J0 less than ohm J.K [ ohm] V GZ/AR open xxx open xxx open 6 xxx open xxx J.K [ ohm] J open J6 open J K J9 open J0 open J. meg [K] J. meg J. meg Not Used: J,J,J & J MultiCap Lugs A B C D xxx xxx xxx xxx
11 Test & Measurement Data 0Hz.V ohm Hz.V ohm 0Hz.V ohm 0Hz.9V ohm 00Hz.9V ohm 00Hz.V ohm 00Hz.V ohm khz.v ohm khz.v ohm khz.6v ohm 0kHz.V ohm 0kHz.69V ohm 0kHz.V ohm 0kHz.V ohm 0kHz.9V ohm 60kHz.0V ohm 0kHz.V ohm 0kHz.9V ohm 90kHz.6V ohm 00kHz.9V ohm diytube ST0 driver closed loop W output 0mVrms input THD+N (%) Gain (db) diytube ST0 Driver Gain W diytube ST0 Driver THD+N (%) W Hz 9.V +.0dB.%THD+N ohm Hz.99V +.0dB.%THD+N ohm 0Hz 9.V +.0dB.%THD+N ohm 0Hz.9V +.0dB.0%THD+N ohm 00Hz.9V +.0dB.09%THD+N ohm 00Hz.9V +.0dB.0%THD+N ohm 00Hz.9V +.06dB.0%THD+N ohm khz.9v +.0dB.0%THD+N ohm khz.96v +.0dB.06%THD+N ohm khz.9v +.0dB.%THD+N ohm 0kHz.V +.db.9%thd+n ohm 0kHz.V ohm 0kHz.V ohm 0kHz.V +.db.09%thd+n ohm 0kHz 6.V ohm 60kHz 6.V ohm 0kHz.6V ohm 0kHz.V ohm 90kHz.V ohm 00kHz.V ohm THD+N (%) Gain (db) diytube ST0 Driver Gain 0W diytube ST0 Driver THD+N (%) 0W... diytube ST0 driver closed loop 0W output 60mVrms input
12 Test & Measurement Data 0Hz.V ohm Hz.06V +.0dB.6%THD+N ohm 0Hz.V +.06dB.%THD+N ohm 0Hz 6.9V ohm 00Hz 6.9V ohm 00Hz 6.9V ohm 00Hz 6.96V ohm khz 6.9V ohm khz 6.9V ohm khz 6.V ohm 0kHz 6.V ohm 0kHz.6V ohm 0kHz.9V ohm 0kHz.V ohm 0kHz.V +.6dB.%THD+N ohm 60kHz.V ohm 0kHz 0.V ohm 0kHz 9.V ohm 90kHz.V +.0dB.%THD+N ohm 00kHz.0V ohm diytube ST0 driver closed loop W output.06vrms input THD+N (%) Gain (db) diytube ST0 Driver Gain W diytube ST0 Driver THD+N (%) W Hz.V +.66dB.%THD+N ohm Hz.V +.db.6%thd+n ohm 0Hz.V ohm 0Hz.V ohm 00Hz.V ohm 00Hz.V ohm 00Hz.V ohm khz.9v ohm khz.6v ohm khz.v ohm 0kHz.0V +.db.%thd+n ohm 0kHz.V +.db.%thd+n ohm 0kHz 6.V ohm 0kHz.9V ohm 0kHz.V ohm 60kHz.V ohm 0kHz.V ohm 0kHz 0.6V ohm 90kHz 9.V ohm 00kHz.6V +.0dB.6%THD+N ohm diytube ST0 driver closed loop %THD at khz.6vrms input THD+N (%) Gain (db) diytube ST0 Driver Gain %THD+N - W diytube ST0 Driver khz - W
13 Test & Measurement Data 0Hz.6V ohm Hz.9V ohm 0Hz.9V ohm 0Hz.0V ohm 00Hz.V ohm 00Hz.V ohm 00Hz.V ohm khz.v ohm khz.v ohm khz.v ohm 0kHz.V ohm 0kHz.V ohm 0kHz.V ohm 0kHz.96V ohm 0kHz.V ohm 60kHz.6V ohm 0kHz.0V ohm 0kHz.V ohm 90kHz.V ohm 00kHz.9V ohm diytube ST0 driver open loop 0mV input 0mVrms input THD+N (%) Gain (db) diytube ST0 Driver Gain vs - No Feedback diytube ST0 Driver THD+N vs - No Feedback //0 Tests were conducted using: Hewlett-Packard 90B Audio Analyzer diytube Audio Acq v.0 software Hewlett Packard A Voltmeter Tektronix TDS0B DPO BK Precision 90.0% DMM No-name garbage signal generator
14 Test & Measurement Data khz Square Wave at 0W Output 0 khz Square Wave at 0W Output
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