February 22, 2024, 06:48:03 AM

Author Topic: Slight hiss with 6SN7 at -9DB setting  (Read 3251 times)

0 Members and 1 Guest are viewing this topic.

Offline Happy Ghost

  • Full Member
  • ***
  • Posts: 138
Slight hiss with 6SN7 at -9DB setting
« on: May 10, 2022, 11:39:56 AM »
Hi All,

I have a fully functional C2A with the 2quiet upgrade, which I have been enjoying a lot for the past few months. Recently I got a few 6SN7's also for some tube rolling. But one of the new production tube gives a noticeable hiss at only the -9db setting on the coarse attenuator. At other volume levels above and below it is dead quiet. Any idea on what could be the reason? Should i let the tube just "cook in" for some time and hope that maybe that will fix the problem? or does it look like it could be a damaged tube?  Any ideas?


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 19257
Re: Slight hiss with 6SN7 at -9DB setting
« Reply #1 on: May 11, 2022, 04:59:59 AM »
I would let it run in for a while. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man