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.

[LADR]

Well It works now with low volume. A good friend found a Sonora schematic that is nearly the same as my set.

[vortalexfan]

Originally Posted by LADR

Well It works now with low volume. A good friend found a Sonora schematic that is nearly the same as my set.

I have tons of early Sam's Photofacts from the late 1940s when they first got stated up to the mid 1950s, give me the chassis number on your radio and I'll see if I have the service manual for your radio.