05-10-2015, 03:08 PM
I have picked up this valve in a job lot and it's not one I am familiar with. It's obviously very early, pre-1920 perhaps and I can just about make out the following writing on the glass envelope:
R.5v
(BBC logo)
G9764
The base is stamped MOV Co. Ltd. and around the base it is engraved with G and A, presumably for Grid and Anode. The other two pins are unmarked so I'm assuming are for the filament. One side of the envelope is internally metallized, the opposing side clear. I was very excited when I saw it because almost every valve in the job lot was good, but sadly I can't get a continuity reading across the filament pins of this one.
I have looked at the online records at The National Valve Museum and there is a R Type valve, BTH being one manufacturer mentioned. However, although there is also a reference to MOV Co. Ltd. I cannot find this particular example. The R Type ones on the website look different.
It's a rather handsome valve and perhaps worth keeping as an oddity, but, if it is a R Type, I was also wondering if it was worth adding this example to the website at the NVM and perhaps at RadioMuseum too. Thoughts?
Nick
R.5v
(BBC logo)
G9764
The base is stamped MOV Co. Ltd. and around the base it is engraved with G and A, presumably for Grid and Anode. The other two pins are unmarked so I'm assuming are for the filament. One side of the envelope is internally metallized, the opposing side clear. I was very excited when I saw it because almost every valve in the job lot was good, but sadly I can't get a continuity reading across the filament pins of this one.
I have looked at the online records at The National Valve Museum and there is a R Type valve, BTH being one manufacturer mentioned. However, although there is also a reference to MOV Co. Ltd. I cannot find this particular example. The R Type ones on the website look different.
It's a rather handsome valve and perhaps worth keeping as an oddity, but, if it is a R Type, I was also wondering if it was worth adding this example to the website at the NVM and perhaps at RadioMuseum too. Thoughts?
Nick
