High Frequency Noise

Haakonl · 3953

0 Members and 1 Guest are viewing this topic.

Offline Paul Joppa

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 5822
Reply #15 on: July 13, 2023, 04:41:53 AM
I tried this but with no effect. While trying it I noticed, to my great confusion, that the noise is greatly reduced when I hold my hand around the tube, especially at the front. I guess this means I should buy a Faraday cage for the tube, or is there any other way to remedy this? And if the solution is a Faraday cage, does anyone have any suggestions on where to buy ones that fit 6SN7?

I unfortunately do not own an AM radio, though thanks for the tip, I will try to borrow one to test!
Octal tube shields can be hard to find, but they do exist. Here are some (ugly) examples:

https://www.ebay.com/itm/115832857135?chn=ps&mkevt=1&mkcid=28&srsltid=ASuE1wQuswwiLE149kSDCSmoO98mcFDghtanSPsXyMtNWipOzO_VoY7AWi4

Paul Joppa


Offline Haakonl

  • Newbie
  • *
    • Posts: 8
Reply #16 on: July 16, 2023, 03:24:03 AM
Thanks for the suggestion! I will look into getting one and update you on the result.



Offline Doc B.

  • Administrator
  • Hero Member
  • *****
    • Posts: 9641
    • Bottlehead
Reply #17 on: July 16, 2023, 08:10:17 AM
The solution might be to try a different 6SN7.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.