Quote:
Originally Posted by kalee20
Will Synchrodyne have any insight, I'm wondering? He often does when valve development is concerned.
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Sorry to say that in this case I do not have any insights. I'd say that GrimJosef has summed it up - progressive improvment.
As long as the characteristics changes brought by the improvements did not disqualify the improved versions from applications for which the original versions were recommended, redesignation would not appear to have been imperative. Apart from lack of back serviceability, another trigger for redesignation would be that the improved version was intended to suitable for applications beyond the reach of original, i.e. what might be called lack of forward serviceability.
Was the GZ34 of what might be called "late octal" form, that is with a glass button base/foot that was fitted into an octal "boot", as was done with the EL34?
Cheers,