04-28-2023, 09:11 PM
I would not go as far as replacing sockets.
However, I would
- when the radio warms up, and the problem surfaces up
1. Wiggle the tubes, applying a bit more force than the poke of a wooden dowel. Especially the 12SQ7
2. Maybe wiggle (forcefully) the volume pot.
3. Maybe during the low vol touch grids with a 1nF cap (or if on dry non-basement surface - with 10nF, or if with isolation transformer - with a screwdriver touched by finger), starting from the output and back to RF, and see where the vol goes from Hi to Low.
That would be my start.
And, yes, if possible, the 12SQ7 should be replaced.
However, I would
- when the radio warms up, and the problem surfaces up
1. Wiggle the tubes, applying a bit more force than the poke of a wooden dowel. Especially the 12SQ7
2. Maybe wiggle (forcefully) the volume pot.
3. Maybe during the low vol touch grids with a 1nF cap (or if on dry non-basement surface - with 10nF, or if with isolation transformer - with a screwdriver touched by finger), starting from the output and back to RF, and see where the vol goes from Hi to Low.
That would be my start.
And, yes, if possible, the 12SQ7 should be replaced.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
