Re: 50C5 valve with a strange fault.
Thanks for the replies so far, the usual pins of 3 & 4 are working correctly for heating the valve, the filament return on the machine is to pin 3, pins 2 & 5 should not be connected to anything other than G1, but the valve still glows on these pins.
Another valve has been used on the machine to verify that the holder is working as it should.
When lightly (with finger only) tapping the valve whilst holding it (no test gear needed), there is a slight movement sound, I'm now wondering if the valve has had a bang at one time but not enough to break it.
All of this is more of a curiousity if anything, these are available on a well known auction site if need be.
Rick.
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