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 Post subject: Drake browning radio
PostPosted: Jan Thu 12, 2017 3:14 am 
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Joined: Aug Sat 06, 2016 3:03 am
Posts: 19
Location: derry nh
I'm trying to restore an old drake browning neutrodyne and the parts list calls for a general radio transformer with a 6:1 winding ratio (type 285). I haven't been able to find one but I do have a kelford no 64-a transformer with a 5:1 winding ratio, will this work?


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 Post subject: Re: Drake browning radio
PostPosted: Jan Thu 12, 2017 5:31 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 35768
Location: Livermore, CA
Hi and Welcome

Yes, 1:5 turns ratio will work. A little less gain than 1:6 but shouldn't notice a difference. Most new replacement audio interstage transformers are 1:3.

Many Browing Drake radios are regen with National coils. If you have one of these it may have 4 tubes rather than 5 often found in early battery radios.

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 Post subject: Re: Drake browning radio
PostPosted: Jan Thu 12, 2017 5:51 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11073
Location: S. Dartmouth MA 02748-1225 USA
The variations of this radio are nearly endless. It's basically a use what you have radio. The primary elements are an RF coil and a slot wound "regenaformer". A name misspelled by the manufacturer as "reagenaformer". From two to as many as six tubes, the audio amplifier can be a transformer, impedance or resistance coupled, single or push-pull output. I have five Browning-Drakes in my collection, no two alike, one I built and one a factory assembled model. Yes, I did use a 6:1 Kelford in the homebrew...
FWIR Shamrock made coil sets that performed like the B-D. There are plans in one of the radio handbooks from the 20's how to make the coils...

Chas

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Last edited by Chas on Jan Thu 12, 2017 5:56 am, edited 1 time in total.

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 Post subject: Re: Drake browning radio
PostPosted: Jan Thu 12, 2017 5:56 am 
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Joined: Aug Sat 06, 2016 3:03 am
Posts: 19
Location: derry nh
This radio is very odd, I'll post pictures of it later, it doesn't seem to follow the original schematic. The diagram has pictures of the two transformers and their respective labels in terms of plate, grid and filaments but the actual transformers terminals don't match even if I rotate them.


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 Post subject: Re: Drake browning radio
PostPosted: Jan Thu 12, 2017 6:00 am 
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Location: S. Dartmouth MA 02748-1225 USA
I am not at all surprised...

Do you have both a schematic and a diagrammatic, yes?

Chas

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There Are None So Blind As Those Who Will Not See: John Heywood, 1546


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 Post subject: Re: Drake browning radio
PostPosted: Jan Thu 12, 2017 6:10 am 
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Joined: Aug Sat 06, 2016 3:03 am
Posts: 19
Location: derry nh
I have both a diagram and schematic. I'll post them tomorrow with pictures. I'd really like to find a general radio 6:1 transformer.


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 Post subject: Re: Drake browning radio
PostPosted: Jan Thu 12, 2017 6:20 am 
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Location: S. Dartmouth MA 02748-1225 USA
Fitzsimons1984 wrote:
I have both a diagram and schematic. I'll post them tomorrow with pictures. I'd really like to find a general radio 6:1 transformer.
I understand, following the plans. When completed, results would be as expected...

Post a WTB in the classifieds for the transformer. Also, set a search in ebay with an email response, should someone post an auction for the transformer, you would get an email.

GL

Chas.

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There Are None So Blind As Those Who Will Not See: John Heywood, 1546


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