Ken
I think you have been around as long as I (40+ years in electronics). There
was a line of transistorized modules that took the place of tubes. I cannot
remember the type numbers or manufacturor of them. I have used several meters
that had been changed to transtubes such as the H.P. 400D voltmeter. I remember
there was available a set of replacements for all the miniature tubes in the
Collins KWM-2. The advantage of the transistorized replacements was lack of
constant changes due to cathode emission and thus lengthened the time between
calibration checks.
73's de Tom Manning, AF4UG
<[EMAIL PROTECTED]>
Ken Arck wrote:
> At 09:17 AM 3/23/2004 -0800, you wrote:
> >Just before the transistor, solid state tubes. They are small and round.
>
> <---As I posted earlier, the only "solid state tubes" I can think of were
> actually "solid state" diodes that were made as replacements for the older
> vacuum tube rectifiers, such as the 5U4 series. I don't remember ever
> seeing these type of replacements for tubes such as triodes, pentodes and
> so on. Anyway, those M9394's are transistors (germanium as I recollect)
> that are part of the high voltage power supply and aren't RF devices.
>
> But I suppose this is all moot - it would make a terrible repeater in any
> case :-)
>
> Ken
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