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

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Old 26th May 2022, 6:53 pm   #1
mickm3for
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Default TRF radio with small B4 valve base.

Hi i have a trf 1valve radio with a 4 pin skt but the socket is around 1/3 rd the size any ideas on valve type or skt type Mick
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Old 26th May 2022, 6:59 pm   #2
Cobaltblue
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Default Re: trf radio with small b4 valve bace

Maybe one of the little Hivac valves like this one ?

http://www.r-type.org/exhib/aab0169.htm

Cheers

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Old 26th May 2022, 8:56 pm   #3
mickm3for
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Default Re: trf radio with small b4 valve bace

Hi thanks that is the right bace says used in min radio sets so fits the bill and the circuit will work with the pin out of the XH1.5 thank you . next question where to get one ? Mick
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Old 26th May 2022, 9:03 pm   #4
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Default Re: TRF radio with small B4 valve base.

There's one here

https://www.ebay.co.uk/itm/384895873...cAAOSw60dihMiv

There are a few different versions on this base and I suspect any of the triodes would work.

Do a search for Hivac they do turn up

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Old 26th May 2022, 9:42 pm   #5
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Default Re: TRF radio with small B4 valve base.

Thanks Mick
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Old 27th May 2022, 1:58 pm   #6
Mr Moose
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Default Re: TRF radio with small B4 valve base.

Hello,
These miniature Hivac valves were made with two different heater voltages 2 volt and 1.5 volt.
So the XH1.5 has a 2 volt equivalent the XH2.0 etc..
As well as triodes there was also a screen grid valve with a top cap the XSG... .
Yours Richard

Last edited by Mr Moose; 27th May 2022 at 2:09 pm.
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Old 27th May 2022, 2:23 pm   #7
G6Tanuki
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Default Re: TRF radio with small B4 valve base.

Using the same base there were also the "Midgetron" valves made by Park Royal Scientific Co.

Park Royal Scientific was actually a bunch of Hivac staff doing a bit of 'moonlighting' - which resulted in a lawsuit...

Hivac Ltd v Park Royal Scientific Instruments Ltd [1946]

https://onlinelibrary.wiley.com/doi/...1946.tb01005.x
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Last edited by G6Tanuki; 27th May 2022 at 2:29 pm.
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