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I have a TT-1 that I restored about 8 or so years ago. It had a wiring issue from assembly and therefore never worked. Unfortunately, I used contact cleaner spray on the "Grid Current" switch and often would show leakage with no tubes in any socket. So, as mentioned, that spring loaded switch may be the culprit. I have noticed that lately, especially with low humidity, it has been behaving itself and I can use it.
If you doused the switches, you may be able to carefully clean them with denatured alcohol to remove any residue.
Just a thought.
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