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I have a Fender tube amp The Twinn. 4 6l6 2 12at7 and 4 12ax7. Mu reverb is dead and I here some strange oscillation. I suspect the 12at7 in reverb and one 12ax7 Both microphonic and very dem fil. Could this solve the problem ?

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Hi ohmytom

Yes, they could be causing the problem.The filaments are a little hard to see sometimes, you will always get a little microphonic activity about preamp tubes. It may also have failing capacitors depending on how old it is. Is it a "Twin Reverb". Let me know the exact model and we can be a little more specific of the problem and solution. Cheers


regards
robotek

Posted on Jul 14, 2008

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Wot are the send,return,post out socket for on a prosound 4100 amp


These are all related to using external effects processors, like if you wanted to use a separate reverb unit.
"Send" is the output that gives the un-processed signal to the external device, and "return" receives the signal from the external device.
"Post Out" is an output from the amp that occurs AFTER the send/return jacks on the bus, i.e., if you are using an external reverb unit, the "Post Out" signal will include the reverb fx. If you have a "Pre Out" jack, it's signal will NOT include the reverb fx.

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I got this old Reverb Amp from cleaning out a house for a real estate agent. I was wondering its worth & how to go about getting it to someone who would like to have it. Thank You Its a Pioneer SR-202...


It's an old 'spring-type' reverb.

http://en.wikipedia.org/wiki/Reverberation#Spring_reverberators

I have one from the mid-70's, long unused. Digital reverb is more predictable and not susceptible to rom vibrations or jarring. There are those who would still want one.

You might put it out on eBay. They don't get much for them.

This auction expires in 2 days. The bidding is $20.50 right now. You might watch it to see what the unit eventually goes for.

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Any power supply will do as long as it has the same specs as the dead one, which will be:

Input : x Volts AC
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Hi Fenderman.

Damn, you gotta hate that. First thing, do you have any recourse with the outfit you just bought the amp from? I guess not if you are asking in here. There is not a whole lot that stops the reverb in these amps. First things to check would be that the connections to the rev-eb tank are ok, and the cables to them not damages, and the terminations to the RCA plugs are good. Check that the reverb tank is connected thew right way round also. If everything so far checks out, and yourself, or an electronics savvy mate then time to download the circuit from here

Then from there, pull the chassis out of the box, and check/look for dry/cracked solder joints about the reverb Pot, I would check the voltages about U2, TL072, and even just change it out if you are unsure. The reverb tank could also be down, hard to check this easily without swapping it out, if you have(maybe time for the repair shop here) a CRO, then you can sniff off the audio going in and out of the tank to be sure that is it functioning.

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regards
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1 Answer

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If it's blowing fuses. It probably has a bad output tube.
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1 Answer

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This sounds like a power supply problem. The high voltage for the tubes is not right. Either you are missing an amplification stage because this or one of the coupling caps is faulty. I'd have to see the unit itself to give you any more details.

Dan

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1 Answer

Have a Fender Twin 57 custom shop reissue, 18 months old, keeps blowing the mains fuse after approx 30/40 into a gig. Amp not overdriven, no external FX used


Hi debdenplace

Blowing fuses at gigs is not a very nice habit. I suspect that you need to retube the output stage. It is the most common cause of fuse blowing. Even though not being overdriven, the life you get out of output tubes relates to volume and time. The higher the levels, the more often they may need to be replaced. Go for the Groove Tube replacements if you can afford them GT6L6GE , but I use a gain matched pair of Sovtek Russian made Electro Harmonix ELH6L6EH in this type of amp. They cost about half as much, are designed with Fender style output stages in mind and do a great job.
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regards robotek

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1 Answer

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Keep us posted.
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