10-26-2021, 03:16 PM
Well this project is getting very frustrating. I finished with the recap, replaced all out of spec resistors and put in good tubes.
After a few minutes of playing, the volume drops about 80%. Nothing will get it back other than letting it cool off a while. I've replaced the detector mica cap, tried swapping tubes, wiggling, tapping, cold spray. Nothing helps. Rechecked all the solder joints.
B+ stays about the same when the volume drops. Have not checked all the grid voltages yet.
My next thought is to replace the few remaining dog bone resistors.
Any other ideas ?
After a few minutes of playing, the volume drops about 80%. Nothing will get it back other than letting it cool off a while. I've replaced the detector mica cap, tried swapping tubes, wiggling, tapping, cold spray. Nothing helps. Rechecked all the solder joints.
B+ stays about the same when the volume drops. Have not checked all the grid voltages yet.
My next thought is to replace the few remaining dog bone resistors.
Any other ideas ?