Tube DIY Asylum

RE: Too much sibilance in my newly built amp.

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FenderLover

In Reply to: RE: Too much sibilance in my newly built amp. posted by DAK on July 24, 2016 at 01:54:01

I'd try carbon comp resistors as grid stoppers & see if that sibiliance relaxes.

Follow Ups:

RE: Could it be a break in issue? - DAK 10:44:46 07/24/16 (5)
The Vishay were not cheap and since i mounted them very close to the socket I may not be able to salvage them after removal. Do you suppose they would "break in"?
- Remove one leg of the Vishay - FenderLover 17:53:37 07/24/16 (4)
  Insert a similar ohm Allen-Bradley carbon comp. See if you hear a difference. If so, remove the Vishay. If not re-attach the Vishay.
  Not much current passes onto the signal grid (at least I hope not much) --- I doubt you'll see much break-in.
  BTW... you aren't seeing any significant DC leakage across any of your coupling caps? This may also causes oddball sounds to ride on top of notes and voices.
  
  Edits: 07/24/16
  - RE: Good idea - DAK 19:05:47 07/24/16 (3)
    I might try it but the space is pretty tight. I will play the amp and accumulate at least 100 hours before deciding. thanks for the help
    - Be interested in your results - FenderLover 07:02:26 07/25/16 (2)
      I've never used anything, but a carbon comp resistors in grid stopper position.
      - RE: Be interested in your results - lovetube 07:08:57 07/25/16 (1)
        
        In Reply to: RE: Be interested in your results posted by FenderLover on July 25, 2016 at 07:02:26
        
        but most vintage CC resistor is out of specs by now. would they still be used ?
        
        RE: Be interested in your results - FenderLover 07:53:59 07/25/16 (0)
        
        In Reply to: RE: Be interested in your results posted by lovetube on July 25, 2016 at 07:08:57
        
        I have a bunch of NOS A-B resistors. Measure before use.

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