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 Post subject: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Tue 21, 2021 2:52 pm 
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Joined: Oct Wed 25, 2017 5:01 pm
Posts: 36
Hi. It is a while since I visited your site. Hope everyone is O.K?
I am trying to find details of the Brunswick equivalent number of the 1939 Decca Prestomatic tube radio model PT/AC.
The Brunswick has International Octal tubes, whilst the Decca has British tubes (5-pin).
Both radios seem to be very rare indeed. The stringing for the capacitor has broken on the Brunswick.
Both models are in an upright wood cabinet with a curved top and look similar. If you look on the radio museum site you will at least see the Decca example. Both models have manual and press button tuning.
As well as tube differences there are some circuit differences, and the tone control is wired up differently.
I would be interested to hear from anyone who knows the model number of the Brunswick.
Cheers
Mike (U.K)


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 Post subject: Re: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Tue 21, 2021 3:24 pm 
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Joined: Apr Sun 01, 2012 9:55 pm
Posts: 13110
Location: Seattle, WA
Hi Mike, welcome back. I'd love to see pictures of your examples of these 2 radios.

Also, not that it will help, but can you tell us the tube lineup of the Brunswick?

_________________
Rodney -- KG7EPW
Measure it with a micrometer, mark it with chalk, cut it with a chainsaw.


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 Post subject: Re: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Wed 22, 2021 3:09 pm 
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Joined: Oct Wed 25, 2017 5:01 pm
Posts: 36
Hi Rodney. Many thanks for your reply. Both the Decca and the Brunswick (front views) look the same, but the Brunswick is the one with octal tubes. I believe the Brunswick has 6P8, 6R7, 6U7, 6V6, 5Z4 ,but will confirm that next time. I have a booklet that shows the tube line-up of most major and lesser known radio companies and models. It states that the Decca is pre WWII with British 5-pin, whilst the pre WWII Decca radio models are termed as Brunswick.
Wonder if by 1939 Decca had run out of British tubes, and used the I.O types, and that it was still termed as Decca? I can not find any service details only a radiogram Brunswick 39CGM.
See the Radio museum site for the Decca PT/AC front view.
Regards
Mike


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 Post subject: Re: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Wed 22, 2021 3:32 pm 
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Joined: Apr Sun 01, 2012 9:55 pm
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Location: Seattle, WA
6P8 huh? Uncommon tube.

There are a couple schematics in RadioMuseum for similar models.

Take a look at:
https://www.radiomuseum.org/r/brunswick ... _39eh.html
https://www.radiomuseum.org/r/decca_2_ptm.html
https://www.radiomuseum.org/r/decca_2_ml6.html

_________________
Rodney -- KG7EPW
Measure it with a micrometer, mark it with chalk, cut it with a chainsaw.


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 Post subject: Re: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Fri 24, 2021 2:13 pm 
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Joined: Oct Wed 25, 2017 5:01 pm
Posts: 36
Hi Rodney
Many thanks for your reply.
Will have a look at those you suggested.
Cheers
Mike


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 Post subject: Re: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Tue 28, 2021 2:29 pm 
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Joined: Oct Wed 25, 2017 5:01 pm
Posts: 36
Hi Rodney.
Both the Decca PT/AC and the later model with octal tubes have 3 scale lamps (2 are for the actual scale, the third being a waveband indicator). None of the Brunswick manuals show the third lamp.
Wonder if these later radios are still a PT/AC bust just a modification?
The 6P8 tube has been replaced by a 6K8; the others have been replaced by 6K7, and 6Q7
Cheers
Mike


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 Post subject: Re: Decca Prestomatic radio with I.O tubes
PostPosted: Sep Wed 29, 2021 3:55 am 
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Joined: Apr Sun 01, 2012 9:55 pm
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Location: Seattle, WA
mhorne63 wrote:
Wonder if these later radios are still a PT/AC but just a modification?

Hi Mike,

I really have no idea about the Brunswick. Maybe someone else will chime in with specifics.

In general, it wasn't unheard of for a radio manufacturer to use the same basic chassis for 2-3 years with only a few minor modifications from year to year. So I think it's entirely possible.

Best,
Rodney


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