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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 3rd Jun 2020, 10:31 am   #21
Join Date: Nov 2011
Location: Chippenham, Wiltshire, UK.
Posts: 185
Default Re: Valve testers and E88CC / ECC88 valves

Originally Posted by factory View Post
Could that batch be mislabelled?
Early on in this saga, I suspected the same and inspected the inside of one of the CV2492s with a x10 hand lens. Each of the pins was connected to the appropriate electrode.

The batch of ten was removed from a 1970s MOD signal generator sub-unit. It might be that they had had a hard life, even though their getters and external condition appeared pristine. All the other examples of E88CC and ECC88 that I have test OK for both triode sections.

Either these CV2492s are a duff lot or they do not have the same electrical characteristics as E88CCs (the commercial equivalent is given as E88CC/01). It might be possible, as suggested before, that these CV2492s give parasitic oscilation on the A2 side. I suppose the real test would be to put one into a working piece of equipment usually fitted with an E88CC - such as a 1950s state-of-the-art 2-metre convertor.

Many thanks for people's continuing suggestions.

- Peter
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Old 6th Jun 2020, 9:45 am   #22
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,111
Default Re: Valve testers and E88CC / ECC88 valves

What would happen if you connectd the screen to the cathode? i.e. pin 9 to selector 2?
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