12-15-2021, 06:54 PM
Hello,
After cleaning the chassis installed a new dial light and cord, I replaced all paper caps, electrolytic caps, and some crumbling wiring. I powered up the unit via a dim bulb tester and everything seemed to be coming to life ok. Then the 4700 ohm resistor (#29) tied to the 6J8G DET-OSC tube began to smoke! I shut down the unit, replaced the resistor and began to troubleshoot.
I rechecked all other resistors and made sure all caps were correctly wired.
I removed the 6J8G and the resistor still got very hot - shut the unit down - checked the make sure the resistor was still good.
I replaced the 6J8G and removed the 1232 tube and the resistor still got very hot - checked the make sure the resistor was still good.
I replaced the 1232 and removed the 7B7 tube and the resistor still got very hot - checked the make sure the resistor was still good.
I replaced the 7B7 and tore apart the IF can (#30) and replaced the old rubber wires.
Powered the unit up and the resistor still got very hot.
Please let me know what next steps I could take to figure out where the problem is.
Many thanks!
After cleaning the chassis installed a new dial light and cord, I replaced all paper caps, electrolytic caps, and some crumbling wiring. I powered up the unit via a dim bulb tester and everything seemed to be coming to life ok. Then the 4700 ohm resistor (#29) tied to the 6J8G DET-OSC tube began to smoke! I shut down the unit, replaced the resistor and began to troubleshoot.
I rechecked all other resistors and made sure all caps were correctly wired.
I removed the 6J8G and the resistor still got very hot - shut the unit down - checked the make sure the resistor was still good.
I replaced the 6J8G and removed the 1232 tube and the resistor still got very hot - checked the make sure the resistor was still good.
I replaced the 1232 and removed the 7B7 tube and the resistor still got very hot - checked the make sure the resistor was still good.
I replaced the 7B7 and tore apart the IF can (#30) and replaced the old rubber wires.
Powered the unit up and the resistor still got very hot.
Please let me know what next steps I could take to figure out where the problem is.
Many thanks!