Sonora 455

[LADR]

I need to find a schematic on this radio. I cannot find it in Sams, Beitmans or Riders. Last owner did some hack-ups.

[dieseljeep]

Originally Posted by LADR

I need to find a schematic on this radio. I cannot find it in Sams, Beitmans or Riders. Last owner did some hack-ups.

List the tube types. It must be a simple 4 or 5 tube radio.
Sonora made a lot of radios for Wards and a few others.

[LADR]

Originally Posted by dieseljeep

List the tube types. It must be a simple 4 or 5 tube radio.
Sonora made a lot of radios for Wards and a few others.

It’s actually 6 tube. 35W4, 35C5, 12AV6, 12BA6, 12AU6 and 12BF6

[mr_rye89]

Probably an All American 6 type circuit considering the very common tube types. I wonder why 6 tubes if it's just AM? Maybe it has an RF amp stage

[old_coot88]

The 12BF6 is the oddball in the lineup. Wonder what its function is being it's a dual-diode/triode, and the 12AV6 is also a dual-diode triode.

[dieseljeep]

Originally Posted by old_coot88

The 12BF6 is the oddball in the lineup. Wonder what its function is being it's a dual-diode/triode, and the 12AV6 is also a dual-diode triode.

According to the tube lineup, the radio in question has a separate osc and mixer stage. The osc. is the 12BF6 and the mixer is a 12AU6, the rest of the circuit is the typical AA5 type. You only needed a low mu triode for the osc function.