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Model 30 Premier Radio
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Author:  jamescameron [ Sep Mon 13, 2021 12:24 am ]
Post subject:  Model 30 Premier Radio

I just bought a Model 30 Premier radio marked inside as made in Defiance, Ohio for $30. It's a 7 tube set with 6 of the tubes. Otherwise appears to be complete and unmolested. It came with a very nice working Rola Re-Creator metal horn speaker with the original felt bottom intact. I've found info on the Rola, but hardly any on the Premier, just a couple of pictures and notes, but no schematics or specifications. Does anyone have schematics or specifications to share?

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Author:  JnTX [ Sep Mon 13, 2021 2:13 am ]
Post subject:  Re: Model 30 Premier Radio

If you are a Radio Museum member, you can send an email to the owner of the Premier 30 in the museum.

Jay

Author:  Indiana Radios [ Sep Mon 13, 2021 1:56 pm ]
Post subject:  Re: Model 30 Premier Radio

Looks like a standard TRF set featuring a four tube resistance/capacitor coupled amplifier for better audio fidelity and less audio distortion. I suspect all of the tubes are 01As except the last tube which is probably either a 12A or a 71A depending on how the set is wired up.

Author:  jamescameron [ Sep Mon 13, 2021 9:58 pm ]
Post subject:  Re: Model 30 Premier Radio

I am a Radiomuseum.org member. I'll see what I can find out. Starting from the rear left, the existing tubes are 1- CX301A Cunningham 2- UX201A Radiotron 3- UX201A Radiotron 4- 201A Ray O Vac 5- CX301A Cunningham 6- UX201A Radiotron 7- Empty. So it looks Ike the tubes were replaced at times. There are no chassis socket markings, so was it all 201s? I understand the 301 is a 201 replacement. Across the back there are the binding posts. From left to right: 1- GND 2- A BAT- 3- +A BAT -B 4- 22 VOLTS + 5- 90 VOLTS + 6- 135 VOLTS + 7- SPEAKER + 8- SPEAKER - 9- ANT

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Author:  jamescameron [ Sep Mon 13, 2021 10:08 pm ]
Post subject:  Re: Model 30 Premier Radio

I'm not sure how to determine the last tube as mentioned by Indiana radios. I forgot a picture of the Rola, so here it is.

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Author:  Chas [ Sep Mon 13, 2021 11:40 pm ]
Post subject:  Re: Model 30 Premier Radio

Your notation about the rear terminals states a -22 (volts). This appears to indicate a UX-112 or CX-112, or any other brand of 112 as the output tube.

An '01a can be used (201a) if the -22 is reduced to -9 or -15. FWIK the Rola speaker, if in good working condition, should have a diaphragm adjustment. That will enable one to make the speaker more sensitive to the lesser output of the 201a.

GL

Chas

Author:  Indiana Radios [ Sep Tue 14, 2021 3:26 pm ]
Post subject:  Re: Model 30 Premier Radio

James, your description of the various hook up connections is a bit confusing. Is this the lineup on your set?

From left to right:
1. Ground
2. -A Battery
3. +A/-B Battery
4. +22 Volts
5. +90 Volts
6. +135 Volts
7. +Speaker
8. -Speaker
9. Antenna

The way I see it, the +22 volts should be -22 volts which would be the norm when working with +135 volts on a transformer coupled amplifier but those rules may not necessarily apply when working with a resistor/capacitor coupled amplifier. I notice that there is an audio transformer coupled to the detector tube, yet, there's no +45 volts being used so I think that 22 volts is actually +22 volts for the plate voltage of the detector tube (00A or 01A). The audio transformer probably is probably a high ratio version (10:1 or similar) designed specifically for use with a 00A detector tube. For today's usage, the better setup would be using a 01A tube with a low ratio audio transformer (3:1 or similar) and using +45 volts on the detector's plate instead of +22 volts.

Can you read what the ratio is printed on the transformer. Many 1920s audio transformers have their winding ratios printed on them.

You might want to look into investing into a ARBE-III power supply. It will provide all of the voltages that your Premier requires to run it: https://www.arbeiii.com/ARBE-III/

Author:  jrehkopf [ Sep Tue 14, 2021 4:44 pm ]
Post subject:  Re: Model 30 Premier Radio

jamescameron wrote:
I'm not sure how to determine the last tube as mentioned by Indiana radios. I forgot a picture of the Rola, so here it is.

You can determine the last tube (112A or 171) by pulling the tubes out and measuring ohms between the "Speaker-" and the plate pin contact in the socket.

Find the detector socket the same way, measure ohms between 22+ and the socket plate pin contact.

That aluminum shield-looking thing at the bottom of your photo may be a holder for a "C" battery. Any loose wires in that area? Or a pair of metal contacts?

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Author:  jamescameron [ Sep Wed 15, 2021 1:52 am ]
Post subject:  Re: Model 30 Premier Radio

The terminal is +22v. The transformer doesn't show the windings, I've included some pictures of the transformer and the tuning condenser. I'll check the ohms as described when I have access to my tools (pending heart surgery at Cleveland Clinc is impeding my fun stuff). The sheet metal appears to be a shield, not a battery holder. No loose wires on this set. It really appears to be complete, less one tube but plus much dust and cobwebs. No mouse presence. I downloaded a couple of old radio books with TRF info to combat my serious ignorance about these sets. I've got a Radiola and a Fearnola I haven't cured yet.

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