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Electro Harmonix Super Space Drum Repair

The unit has no output, no sound. I would like to have access to schematics to repair this unit. It's basically an analog synthesizer and is becoming popular again. Thank you. Paul

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Hey mate

is the circuit for the space drum. Cool old machine. check it out on YouTube

Posted on Sep 06, 2008

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1 Answer

30 year old Philips A12000 amplifier. Making fairly loud crackling sound from right channel.

Likely anelectrolytic coupling capacitor is going bad. Could cause further damage... repair before further use. A competent tech using an oscilloscope should be able to repair the unit, even without a schematic.

Jul 24, 2011 | Philips Audio Players & Recorders

1 Answer

One channel thermal overload stays lit and no output from that channel. even after unit sits overnight, thermal light on immediately,unit not hot. Looking for schematic?

Red light is on if:
- thermal protection, overheated amp, bad thermo sensor
- DC at speaker terminals
- high current at output transistors
Also could be a protection circuit malfunction.
In any case you need new channel module or send your module or whole amp for repair here.

Jul 12, 2011 | Adcom GFA-7607 7-Channel Amplifier

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I have a carver M 1.5 amp rt. channel is out.

Carver designs in general are not easy to repair. I would recommend that you send this unit into a Carver authorized service center. The likely problem is the output transistors, but the driver circuits and predrivers are not simple designs and if there is a problem there, it could effect the outputs. Tracing this will require equipment and schematics that I don't believe are available on the net.


Sep 04, 2009 | Carver PM950 Amplifier

2 Answers

My Yamaha M60 amplifier is not working

The most common cause of this is a failure of the output transistors. These amps are not the easiest for access during repair. I would not suggest you attempt this repair if you have no experience working on these. The output transistors and some additional parts in the same circuit are likely to require replacement. Figure on about $50-$70 for parts. Add in the local labor rate for the total repair cost. This is a good unit and is worth the repair cost. You will get many additional years of performance out of it once repaired. Dan

Jun 14, 2009 | Audio Players & Recorders

1 Answer

The power turns on but there is no sound.i have it

This unit is most likely in protect mode. A problem with the last output stage was detected and is preventing the unit from turning on completely. Normally this is a failure of the output transistors in one or more channels. Without testing some of the components inside the unit, I can not say for sure. I would suggest that you bring this unit to a service shop for a detailed repair estimate. Post the results here and we can help you to perform the actual repair. Expect this estimate to cost around $50.


May 11, 2009 | Audio Players & Recorders

1 Answer

Looking for circuit schematic for a Teac AG-7D. There's no visible burning on the board, no blown fuses, the power light comes on, it just won't make a noise any more.

This unit has detected a problem in the output section and the protection circuit is preventing the output relay from turning on. In most cases this is due to shorted output transistors which will need to be replaced. If you have a multimeter, set it to read DC volts and measure the voltage on the three legs of one of the output transistors. You should read .6V, 40V or so and 0.0. I suspect that you will read 40V on two fo the three legs. If so, that is your problem. Please note that the actual reading for the higher voltage may be something other than 40. I don't have the service manual for this model, so I don't know the exact voltage. It will be anywhere from 35V-75V depending upon the actual design and output transistors.

I am not aware of the availability of schematics for this unit, but any shop that works on audio gear should be able to repair this without them.


Mar 09, 2009 | Teac Audio Players & Recorders

1 Answer

Right side speaker input don't work

There are a number of possibilities that can cause this. Since you smelled some burning, I would suspect that the output transistors on the right side have shorted. This can sometimes cause a resistor to burn before that section is turned off. This is a relatively simple repair for anyone familiar with those units. I have rebuilt a number of these over the years and can tell you that the repair is worth the expense. You can figure on $25-$40 in parts plus the local labor rate for the total cost.

If you have a multimeter and can solder, you may be able to repair this. This is not the easiest unit to access however, so if you are not experienced, I would not start here.

Keep me posted.

Feb 02, 2009 | NAD C320 2-Channel Amplifier

1 Answer

Fender Vibro King Pilot light out??

Hi superleaddud

MOst probable, is that an output tube went west(decrease in vol), and in turn popped the fuse(pilotlight went out). It is always a decent first bet that this is what has happened. You get generally 6 months out of a set out output tubes if you use the amp often, and at gig levels every week. I would first check and replace the fuse, and then the output tubes. GT 6L6GE are factory for that amp, and always a fair bet to use the same to replace them. If you cant extend to the budget for the GT's, then Russian made (Sovtek) Electro Harmonix make a decent quality tube that sound good in guitar amps. . Always replace them as a pair, and buy them gain matched. Get the Grove Tubes from a music store, and the Electro Harmonix from an amp repair specialist. Happy to answer any question you may have about the problem. Cheers. A FixYa rating is a great reward for my assistance to you.


Nov 24, 2008 | Audio Players & Recorders

1 Answer

Power On + red LED turns on + but final relay (click) don't come so no sound

Your audio output transistors are shorted and your unit is staying in "protect " mode to protect your speakers from 40 to 60 volts that is being sent at them from the shorted outputs. If you can use a meter you won't need the schematic MOST likely because the outputs are USUALLY the only parts that short out. The output transistors( or chip ) are mounted to the large, finned heatsink. The #'s on the transistors start with "2SA-" and "2SC-" followed by numbers. There are two output transistors per channel. If your unit uses an IC for audio output then the # on the IC will be "STK-" followed by numbers. These parts are available from Good Luck!


Oct 17, 2008 | Denon PMA-2000R 2-Channel Amplifier

1 Answer

Lost power

Hi jackjohn

It could be a tube, it could be the usual old age catching up with it. I would start with checking the tubes and see that they all light the same way and colour. Also check for white dust in the end of the tube where it is normally silver. Give them all one by one a bit of a wriggle when the unit is going to see that they are all seated properly. It may be a rectifier tube 5R4 gone, replace it out or do some DC voltage checks about the place. remember there are high voltages present!! It A new set of output tubes never go astray in a classic amp like this. Use Electro Harmonix 6V6EH output tubes, gain matched set of course. They work great at higher voltages that these ol girls use. You could of course, just drop it to a Fender repair guy... and he'll be able to sort it out without mucking around. :)

I am more than happy to answer any other questions you may have about it, please get back to me here, or use the ASK function to go straight to me :)
If you are still unsure, have problems, or we need to look at the situation more deeply, then before you give a rating for this advice, hit the ASK button Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards robotek

Jun 25, 2008 | Audio Players & Recorders

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