04-27-2026, 04:17 PM
https://philcoradio.com/library/download...l.%201.pdf
I am working on this 3116X and it does work quite well. I’ve changed all the caps, out of range resistors and the tubes test well. It picks up the only local am stations near me and the sound is good. However, it does have this rumbling noise coming thru the speaker.
The rumbling diminishes as it warms up but doesn’t totally go away. Also if I touch the grid cap of the 1st audio tube, a 77, it sounds like a firecracker going off and seems like the speaker diaphragm is going to blow off. Again I don’t know where to begin troubleshooting this as well nor do I know if this is normal.
I’m not experienced enough to know where to start troubleshooting either of these two issues.If anyone knows where I should start and what to check for it would be greatly appreciated. Any and all advice/suggestions are welcome as I have much to learn.
I am working on this 3116X and it does work quite well. I’ve changed all the caps, out of range resistors and the tubes test well. It picks up the only local am stations near me and the sound is good. However, it does have this rumbling noise coming thru the speaker.
The rumbling diminishes as it warms up but doesn’t totally go away. Also if I touch the grid cap of the 1st audio tube, a 77, it sounds like a firecracker going off and seems like the speaker diaphragm is going to blow off. Again I don’t know where to begin troubleshooting this as well nor do I know if this is normal.
I’m not experienced enough to know where to start troubleshooting either of these two issues.If anyone knows where I should start and what to check for it would be greatly appreciated. Any and all advice/suggestions are welcome as I have much to learn.
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