UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Heathkit V-7AUK VTVM 12AU7 substitute

pentoad · 31st Jul 2020, 5:52 pm

I'm finding it difficult to AC balance, It's different every time it's switched.
It could be the 12au7,
I'm wondering if I could substitute an ecc81 or ecc83 which are similar but not the same as a don't have an ecc82 (although I have one I think maybe one but as the numbers have rubbed off in places it's difficult to tell)

31st Jul 2020, 5:52 pm	#1
pentoad Hexode Join Date: Feb 2011 Location: Newcastle upon Tyne, Tyne and Wear, UK. Posts: 280	Heathkit V-7AUK VTVM 12AU7 substitute I'm finding it difficult to AC balance, It's different every time it's switched. It could be the 12au7, I'm wondering if I could substitute an ecc81 or ecc83 which are similar but not the same as a don't have an ecc82 (although I have one I think maybe one but as the numbers have rubbed off in places it's difficult to tell)