Tube DIY Asylum

RE: Swapped Output Tubes

98.97.10.175

JKT

In Reply to: RE: Swapped Output Tubes posted by Triode_Kingdom on June 18, 2024 at 08:26:24

I replaced the output tubes, which were well used, with a fresh quad and they are behaving well. There are 1R resistors at the cathodes for monitoring the bias, 1K grid stoppers and 100R screen resistors. Haven't seen any HF oscillation on scope.

"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln

Follow Ups:

RE: Swapped Output Tubes - Triode_Kingdom 14:09:29 06/18/24 (1)
So... maybe the tubes were gassy (or something else internally wrong), and that was causing a difference simply due to slightly different layout between the two channels. Glad the new tubes fixed it!
- RE: Swapped Output Tubes - JKT 18:25:57 06/20/24 (0)
  I think if you lookout the picture you will see why the used set of tubes were more sensitive to small changes. ;~D
  
  "It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln

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