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Discussion Starter · #1 ·
Hi all, recently picked up this cool old traynor. Put new filter caps and electrolitics . The reveb is very distorted when I dig into a note. Is I play soft it's beautiful. I put new tubes, all resistors are within spec. Tank reads 180 ohm on input and output. Any ideas? Or just get a new tank.
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What do you have the reverb level set at? Is the reverb control working, or maybe stuck on "full"?
At lower settings on the reverb control, can you dig in more with the pick?
Have a look in the tank, any springs disconnected?
 

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If the springs are good, and you measured around 180 ohms at each end, I think the issue is more likely in the circuit than the tank.
Are you equipped to replace components in the amp and familiar with all the safety issues?
 

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Discussion Starter · #5 ·
Hi Jb Welder, yes i know how to discharge caps and be safe...i just replaced them. the reverb was distorted before i swapped out the new filter and electrolitics. i was hoping the new ones would fix the problem no such luck.

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Things to try:
Other known good tubes in V5 and V4 positions.
Check that you have good DC levels at the tube drive and recovery of the reverb circuit. V5 pins 1 & 3, V4B pins 6 & 8.
Should be no DC present on tank side of C22.
Should be no DC on R49 side of C18.
Try changing cathode bypass caps C21 & C19.
(this is all assuming no one has modded the reverb circuit poorly ;))
 

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The ygm1 tank is transformer driven so I don't think it will be the same.
Not sure if you had the problem before you put in the new tubes. If you didn't try it with the old tubes, then a bad new tube is still a possibility.
Troubleshooting can be horribly frustrating when you get new parts bad out of the box, with modern tubes it's not as uncommon as long ago.
This is why I said known good tubes instead of just saying new ones. ;)
 

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Discussion Starter · #10 · (Edited)
So c23 and c24 were leaking. Replaced and the channel as a whole really came to life, but the reverb is still a little fuzzy. I'm going to order a new mod tank.
What do u guys think of the output tubes heater wires. Really faded from heat? Or not to worry the picture is not the greatest. The preamp heaters are nice and green. The output tube heater wire not so

 

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Hi Paul, I wouldn't rush to replace the tank, I would rather first replace all old blue electrolytic caps on the board, especially C21,22,19.
Heater wires look fine, if the insulation is hard, brittle or rotten , it should be replaced, They just used different colour insulation.
 

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Discussion Starter · #12 ·
Hi epis since the picture was taken all the elecrolics have been replaced. And the heater wire is brittle so i guess thats next. U can tell it was geen at one time not in this ppicture thogh.
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Run a guitar-level sine wave through the amp, and scope the input and output of the reverb tank. So you can find out if the amp is driving the reverb tank with a distorted signal, or if it's coming out of the tank distorted, or if the distortion is happening in the reverb recovery stage.
 
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