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LADR	06-21-2019 10:14 AM

Sonora 455

1 Attachment(s)

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

06-22-2019 10:41 AM

Quote:

Originally Posted by LADR (Post 3212210)

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. :scratch2:

LADR	06-22-2019 11:05 AM

Quote:

Originally Posted by dieseljeep (Post 3212241)

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. :scratch2:

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

mr_rye89

06-22-2019 05:33 PM

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 :scratch2:

old_coot88

06-22-2019 06:55 PM

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

dieseljeep

06-22-2019 07:29 PM

Quote:

Originally Posted by old_coot88 (Post 3212262)

The 12BF6 is the oddball in the lineup. Wonder what its function is:saywhat: 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	06-23-2019 03:29 PM

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

vortalexfan

07-31-2019 08:37 PM

Quote:

Originally Posted by LADR (Post 3212297)

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.

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