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Date Posted by Category User IP

2014-07-15 (UTC)

AE0Q

HF Amplifiers

mail.alpharadioproducts.com

For Sale - One Pair of used Eimac 3CX800A7 Tubes

For Sale - One Pair of used Eimac
3CX800A7 Amplifier Tubes, $500.
These tubes were removed from a
working HF amplifier. They have
been tested, one at a time, and
both have good output with moderate
grid current. This pair of tubes
would be great for converting an
Alpha 76A, 78, or 374A from the
smaller and more expensive 3CX400
(8874) tubes to the more readily
available 3CX800. The 3-tube Alpha
76PA or CA amplifiers are a drop-in
conversion to a pair of 3CX800A7
tubes, with only a small filament
transformer needing to be added.
Information on these conversions is
on the internet from a number of
sources. Test data for each tube
(both tubes similar): 20w drive, Ip
380ma, Ig 20ma, output 490w. These
are a good pair of used tubes,
1500w output, 50ma Ig in a 1500w
amp. New Eimac 3CX800A7 tubes sell
new for as much as $1100 EACH!

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