Rogers 12-91 or 8R931

[scoobydoo391965]

Looking for some information on this radio. I cannot seem to find a diagram for this radio in all of my paper work. It seems to be a bit

different then others I have. This radio seems to have a regulator tube in it. Would any one know what this tube is and how I could find one

or if there is a way around this. It almost looks like a small lite bulb but glows very orange when on.

This radio also has a export number of 793R1 so am wondering if this is an export model.

Any information on this radio would help.

Thanks

Mike

[Ed Kraushar]

Hi,

I have attached a schematic for your radio at–

https://www.nexicom.net/~oidar/rogersb510.pdf

Unfortunately the schematic is poor due to the very poor quality of the original schematic in the Rogers manual.

Check the chassis layout and parts list your bulb may be used as a fuse, one is indicated.

The tubes are Rogers Spray Shielded types and I would keep them if the radio plays with them as they can be quite rare. The waxed paper tubular capacitors along with electrolytic capacitor should be replaced before using the radio.

Ed.

[scoobydoo391965]

Ed

Thanks for the post. The diagram you have does not seem to be the model I have. The radio is a 1937-38 vintage and would have 2 2×3 tubes
and the newer spray tubes. In the circuit there is a regulator tube model number is 14156. It is also used in the 12-96 model. This model is
close but not the same as the 12-91 I have and connot seem to find this diagram anywhere. .

Mike

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[Ed Kraushar]

Hi,

Sorry about the confusion but I had a seniors moment and posted to the wrong thread.

I saw your post earlier and checked my Rogers manuals but could not find your radio. There is a 12-95 or 7R931 but your numbers do not show up. The 12-95 has two 6K7M, 6A7M, 86M, 6X6, 6F6, 6F5 and two 2X3 tubes. What are the tubes used in your radio? Perhaps with that I could search further.

There is something odd as an "8R" chassis number would have been issued a year later then the "12-91" model number. An "8R" chassis would have a 13/** model number.

Ed.

[scoobydoo391965]

Ed

Im having a issue as well LOL . This is a strange one for sure it seems to have all the same tube line up as a 12-95 but number for another chasis.

I added photos of the white stamp model and chasiss as well. The main issue I have is with the regulator tube in this model is missing but seems to work
without it. I believe this may have been added in yester years because of hydro issues.

Let me know what you think.

Just a side note I have 2 of this models and have same numbers on both.

Mike

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Download IMG_new2.JPG. (Caution: This file may not be virus scanned.)

[Ed Kraushar]

Hi,

I went back into a parts list in the Rogers manual, it lists your part #14156 as a bulb, neon lamp. No other explantion or specs.

I am at a loss for the purpose of it. wonder what would happen if a neon bulb with a suitable base was installed?

Ed.

[scoobydoo391965]

ED

Thanks for the info again. Im not sure of its use but am looking into it but if someone else may know in the group we may find something new out.

Mike

[scoobydoo391965]

Can any one confirm that a zener diode could do the same thing. If so what might be the type of use for this radio.

It seems to have the same tube layout as the 11-95

Thanks

Mike

[kuzzy]

The 12-91X is a New Zealand export model. It’s the same chassis as the 7R931 on page 23 of the Rogers manual. I just bought one of these in Angus 2 weeks ago. I haven’t attempted any work on mine yet, but I also have that regulator tube. My 6X6 still lights up somewhat but was wondering if anyone knew of a replacement?

Paul

[kuzzy]

Mike,

I do believe it’s the same layout as the 11-95. Here’s mine:

https://www.flickr.com/photos/pvkantique … 565349085/

Tube Layout chart:

https://www.flickr.com/photos/pvkantique … otostream/

Paul

[mr-moe]

Paulie I have a couple of the 6X6 if you need one.
Also have the settings to test on Jackson 648 tester.

[kuzzy]

That would be great Moe. I have two or three that I’ve picked up in tube lots but they always tested bad (no green).

Paulie

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