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Big Valve!

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Big Valve!

Post by jskinner97 » Thu May 12, 2016 7:35 pm

A friend of mine sent me a load of pictures of radios she and her dad have in their loft, she also sent me a picture of this massive valve on display in their house!

Whatcha' think it is? Im guessing TV Transmission Valve in the power circuit??

Says Thompson....
She adds
Apparently it was used for mri scans or normally operates submerged in a tank of oil for cooling and insulation.

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Re: Big Valve!

Post by Marconi_MPT4 » Thu May 12, 2016 8:06 pm

Could be this one manufactured by Thales!

Link points to an adobe pdf data sheet.

Heater power alone is roughly 130W with a peak cathode current of 5 Amps.


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Re: Big Valve!

Post by alanworland » Sat May 14, 2016 10:10 am

Wow! What a beauty.
Used in Gulliver's Travels?


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Re: Big Valve!

Post by crackle » Sat May 14, 2016 4:50 pm

Wow, hook it up to an industrial microwave transformer PSU and make a nice class A amp, and see if it will irradiate the neighbourhood.


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Re: Big Valve!

Post by Dr Wobble » Mon May 16, 2016 6:00 am

Nice one Mike. ; ) pity she doesn't have a pair. Looks to be about a foot to 18" tall going by the CD rom case bottom right. What an amazing bit of engineering.


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Re: Big Valve!

Post by Herald1360 » Wed May 18, 2016 8:52 pm

I doubt that's been anywhere near an MRI scanner- from the datasheet it looks more like it was used to control the EHT supply to an X-ray tube, so a CT scanner would be more likely. TBH I don't think valves have ever featured in MRI scanners, even in the RF transmit role- by the time MRI was invented, solid state RF was well up to the job.

I doubt it would be any use at UHF either; it might do as an audio bottle, though it's rather large for its 1KW average anode dissipation rating compared with say four 4CX250s or a couple of 3-500Zs.

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Re: Big Valve!

Post by cobaltblue » Thu May 19, 2016 8:38 pm

Yes in terms of anode dissipation it looks kinda small compared to my favored doorstop the the QY5-3000A

Used for 405 transmitters the 3 examples i still have came from Carradon in the early 1970's


Mike T

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