[Amps] 4-250F tubes

G. Clute gclute@attbi.com
Tue, 24 Sep 2002 11:30:26 -0700


I ran a pair of these on 50 mc. with 2800VDC on the plates.   I used
the 4CX250R version of these, but also had the 4CX250B version in the
amplifier.  It ran great and I really didn't care if they failed, as
they were only  $5.00 each surplus in the late 1960's and early
1970's.  I had 250VDC on the screens with a highly regulated supply.
I found it to be a great tube.  The problem I had was the plate cap
wasn't rated with high enough voltage and it would occasionally arc
over.   I fixed this by painting it with TV corona dope which stopped
the arcing.  The things I did when I was 19 scares me to thing about
them now.

George W7LFD

-----Original Message-----
From: amps-admin@contesting.com [mailto:amps-admin@contesting.com]On
Behalf Of Bill Smith
Sent: Monday, September 23, 2002 1:32 PM
To: amps@contesting.com
Subject: [Amps] 4-250F tubes


Typo-
They are rated at 2000vdc Plate Voltage.
73,
Bill

=====
Bill Smith KO4NR

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