[Collins] 4D32 question

[Glen Zook]

The Hallicrafters HT-20 also uses the 4D32.  There are
a few more transmitters that use the tube but it
definitely was nothing like the 6146.

Glen, K9STH


--- "Dr. Gerald N. Johnson"
<geraldj at storm.weather.net> wrote:

The 4D32 was only used a couple places that I know of,
the Viking I and Collins 32V. It was an odd tube
almost custom made to evade vacuum tube excise taxes
and has lots of glass to metal seals that are large
diameter and so there's more seal surface to leak.