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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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26th May 2022, 6:53 pm | #1 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 947
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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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26th May 2022, 6:59 pm | #2 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,822
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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 Mike T
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26th May 2022, 8:56 pm | #3 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 947
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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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26th May 2022, 9:03 pm | #4 |
Moderator
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Location: Exeter, Devon and Poole, Dorset UK.
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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 Cheers Mike T
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26th May 2022, 9:42 pm | #5 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 947
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Re: TRF radio with small B4 valve base.
Thanks Mick
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27th May 2022, 1:58 pm | #6 |
Octode
Join Date: Jul 2008
Location: Gloucestershire, UK.
Posts: 1,043
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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. |
27th May 2022, 2:23 pm | #7 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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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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