Silvertone 4590 help

[tvdoktor]

I am working on a Silvertone 4590 Console Radio. The audio output transformer is toast and the power transformer has been replaced as well as a 5U4 in place of a 5Y3.

I replaced the power supply caps and have 300vdc with approx 1vac ripple with 1 amp input current.

I tacked in a Stancor A-3880 universal output transformer and the 300 volts drops to about 170vdc. I removed both 6N6s and the B+ returns to 300vdc.

I've been using the schematic for the silvertone 4587A as a reference. Is there a schematic for the 4590 to see if I'm missing something?

Thanks

[Kevin Kuehn]

Originally Posted by tvdoktor

I've been using the schematic for the silvertone 4587A as a reference. Is there a schematic for the 4590 to see if I'm missing something?

Thanks

Doesn't seem to be listed in Sams or Riders as such. Are you sure that's the complete model or catalog number?

[tvdoktor]

4590 is stamped into the rear of the cabinet and is on the label on the chassis.

[Tim Tress]

I have worked on that model; the 4587 is very close. It sounds like the output tubes are drawing excessive current; have you replaced the coupling capacitors? This radio is 1936 vintage, and all of the wax capacitors are going to be leaky. Also, check all of the resistors, as they tend to drift way up in value. I would put the 5Y3 back in, as the 5U4 draws more filament current.