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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 23rd May 2024, 5:43 pm   #1
vinrads
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Default 1930's Ferguson radio

This radio was gifted to me by John (old John) after replacing all the paper capacitors, output TX and HT choke/speaker energising coil the set came to life. At this time I didn't have a circuit, which left me wondering what these strange looking things were which didn't read anything. Having then received a service manual, a big thanks to Dave (G6ONEDave) I discovered they were low voltage cells. Note this radio was built in 1938. I have fitted two E cig batteries and a resistor to obtain 5.5 volts. My next job is to re align the set.

Mick.
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Old 23rd May 2024, 7:12 pm   #2
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Default Re: 1930's Ferguson radio

Grid bias batteries which don't have to supply any current.
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Old 23rd May 2024, 7:26 pm   #3
60 oldjohn
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Default Re: 1930'S Ferguson radio

Hi Mick, Pleased you are making progress with the radio. Strange the Grid Bias battery, I had an Ambassador radio that used a D cell (HP2) Grid Bias supply. I suppose it would give the repair shop a job when it failed possibly many years ahead (Shelf Life) as no current would ever be used as long as the capacitors were in good condition.

John.
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Old 24th May 2024, 11:00 am   #4
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Default Re: 1930's Ferguson radio

Those Mallory Bias Cells were available in 1 Volt and 1.25 Volt versions.

Some restorers inject a little water into the cells with a syringe to re-activate them.
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Old 24th May 2024, 11:43 am   #5
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Default Re: 1930's Ferguson radio

That's a new one on me. Heard of them but never come across a set which employs one.

What's the Ferguson's model, Mick? The only one I have here is the 501AC from 1937.
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Old 24th May 2024, 12:55 pm   #6
vinrads
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Default Re: 1930's Ferguson radio

Hi Nick it's a Ferguson 773 motor tuned , 5.5 volts is applied to a 6j7 which acts on the osc to keep stability when on auto tune . Mick.
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