Peavey classic 30, new tubes and PT with absolutely no sound
I have a 12 year old peavey classic 30.PT has been replaced as the old one burnt out and tubes replaced but it makes absolutely no sound. tubes all heat up as they should. but i am not really sure where to start finding out what the problem is.
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Re: peavey classic 30, new tubes and PT with absolutely...
I'm not sure what "PT" is , but the heater voltage is separate from the other voltages required for this unit to function properly. Please note that with tube systems, there are voltages in the 300-400V range that can cause injury. If you do not have experience with tube based electronics, I would suggest that you bring this to a service center for repair.
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The first thing to do is check or more likely replace the power output devices (located on the massive heat sink) on the faulty channel. Then look around for burnt and damaged parts. You might need to replace bias resistors on that faulty channel, which are connected with the output devices. If it powers up as it stands the power supply section should be OK.
If you switch on the amplifier, do you hear nothing at all?
Or do you hear low level noise or hum out of the speaker? Don't know if you're technician.
If the tubes are glowing, you can measure the high voltage.
Check also fuse 3 and 4, thats the neg. voltage -27V and -14V.
You have have been unfortunate enough to experience an uncommon failure. The bass driver has failed. It is a Black Widow that can have the basket/cone/voice coil assembly replaced as a complete unit. The magnet unbolts from the basket and you bolt on a new one. Classic field service designed product. You will be able to get a new basket from a Peavey equipment stockist. Just ask for a 15' Black Widow replacement basket They cost about $180 here in Australia and you can easily change it yourself. Good Luck and happy jamming.
A FixYa rating would be great for my tech tip to you. Cheers
I have a classic 50/50 as well and re-tubed it with JJ el84s, vintage teslas and mullard 12at7s. As long as you replaced it with EL84s, I can't imagine that the output would be increased enough to damage the OT. When I got my 6505 Combo, one of the 6L6s was bad, and it kept blowing fuses and howling like a banshee. I would think that an OT problem would result in a significant loss of output...or none at all. I've gotten DOA tubes from a few places. I would suggest swapping each tube out 1 by 1, until you find it...if that is indeed the problem...before you pay the cash to have it worked on.