In Reply to: Is it possible that the tubes are getting weak? posted by FenderLover on July 26, 2017 at 07:15:40:
I have not responded because I have been busy doing a sympathetic restoration, plus one channel was down
now does anyone want to trade me some 7868 valves, I have a bunch of tubes including gm70 matched pairs I will be selling off and LOTs of 6v6
I don't have money to allocate to this project so need to sell or trade stuff.
Now I will say after pulling the 100uf cap that feeds the finals I put in very hi voltage 1200v "DC link" type, its no longer grey and limp but becoming a dynamic tube amp its better then the other fisher I had.
I plan on squeezing some russian ssg type in a few coupling areas,this 400 looks ruff on the surface but inside is like bran new! I also installed a 25watt variable resistor for biasing the tubes.
Now if the amp didnt come alive, then I would have made it work for 6v6 bu t the 7868 tube is OK
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Follow Ups
- RE: Is it possible that the tubes are getting weak? - used-hifi 13:34:51 07/26/17 (0)