[Boatanchors] EF50 AKA VT250 RF Pentodes Re: Tube ID's

[RJ Mattson]

I have two red EF50's with matching 9 pin loctal sockets. No mistake - 9 pin 
loctal.
They were state of the art RF pentodes in the late 30's on.
I found this two tube regen construction article in "The Radio Constructor" 
(British) that uses two EF50's for detector and audio.
Hope to try them some day.
bob...w2ami x wn2ami 1962

----- Original Message ----- 
From: "Ian Wilson" <ianmwilson73 at gmail.com>
To: "LARRY D GODEK" <telegrapher at q.com>
Cc: <boatanchors at mailman.qth.net>


Those EF50's will come in useful as spares for those 19 Sets
that you must have somewhere.

The red ones have the highest gm.

Actually, they were a pretty significant tube in their day.

73, ian K3IMW