[Jukebox-list] Re: rockola 1448 Amp question

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.