Quote:
Originally Posted by factory
Could that batch be mislabelled?
David
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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