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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 24th Oct 2018, 6:12 pm   #41
Heatercathodeshort
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Default Re: Murphy V410 TV

Rare with a CME1702. Disconnect the cathode wire from the tube base as a test. More likely to be a solder splash or something similar. J.
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Old 24th Oct 2018, 9:11 pm   #42
FERNSEH
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Default Re: Murphy V410 TV

Hi Nick,
If it is confirmed that the CRT has a grid to cathode short, the cause will be most likely a flake of cathode emissive material between the two electrodes.
Tube reactivators have a "clear short" facility which is usually a high value capacitor charged to something like >250 volts. Connecting the capacitor to offending electrodes should blast away the short circuit.

A near equivalent to the CME1702 is the Mullard AW43-80 but the Murphy doesn't lend itself to the Mullard tube because access to the ion trap is almost impossible. Another CRT to consider is the rather rare Brimar C17SM, this tube does not use an ion trap magnet.

DFWB.
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