High Frequency Noise

[Paul Joppa]

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

[Haakonl]

Thanks for the suggestion! I will look into getting one and update you on the result.

[Doc B.]

The solution might be to try a different 6SN7.