Mystery Valve

[John M0GLN]

I've been sorting through a few old 4 pin battery triodes and came upon this one which is a mystery to me, There's no lettering on the glass just the Cossor label, I've looked through all my valve books and can't find any 4 pin valves with a 6V filament, only 2V and 4V, has anyone any idea what it could be please?

The full label description reads,
"HF and Detector specially designed for high frequency coupling and rectification."

It's a bit academic though as it would require considerably more than 6V to get any electrons flowing through it.

Thanks

John

[ms660]

Cossor 610HF?

Lawrence.

[AC/HL]

Possibly from a 1927 Cossor Melody Maker: http://www.valve-radio.co.uk/literat...ction-leaflet/
(fourth image - instructions)

[John M0GLN]

I was just coming back on to say I know there are 5V UX4 American ones but it looks like you've identified it, I've just checked and it's not in either my Wireless World data book or the AVO valve tester one but I've now seen it on the web.

Thank you very much Lawrence.

John

[John M0GLN]

Originally Posted by AC/HL

Possibly from a 1927 Cossor Melody Maker: http://www.valve-radio.co.uk/literat...ction-leaflet/
(fourth image - instructions)

That will be it, I was looking for a 210HF also for a Cossor, a 1930 Silvertone.

Thanks

John

[Robert Gribnau]

Your valve is mentioned here: https://www.radiomuseum.org/tubes/tu..._detector.html