Yes Jay, rebuilt amp and tubes checked. The schematic im using just shows the pin 5 to pin 2 ground connection. But since mine is reading 12 meg, I believe I see a connection to the field coil, Wouldnt that cause my indications? On Monday, July 31, 2023 at 09:30:40 PM EDT, Jay Hennigan via Jukebox-list jukebox-list@lists.netlojix.com wrote:
On 7/31/23 18:23, Jim McClave via Jukebox-list wrote:
Why cant I find it on the schematic? Am I overlooking something? Indications I get are a loud hum when the jukebox scans or when selecting a record. and the 5U4 power tube starts overloading like crazy.
It looks like there may have been a modification mid-production. Some versions show pin 5 connected to ground via pin 2, others show the 5-ohm resistor.
This resistor won't have anything to do with the hum or 5U4 overload. Has the amplifier been rebuilt? If not, it's overdue. Bad filter capacitors are one possibility, or a possible shorted output tube.