A couple (of easy) questions on these parts.
1. Is the warmup time the same for a 7289, as a 2C39 -- 1 second?
2. Does a low frequency test (curve tracer) provide any useful
information about the condition of these parts... or is it possible for
them to display OK at LF but, be "flat" at a GHz?
3. I also ran some other tubes that fit the outline and they check
basically the same -- Is there any significant difference between 7289's
and: the 7698, Y2177, Y602, the EE-144 and the 2C41?
Thanks in advance & 73,
Marv WC6W
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