No disrespect intended but the 8877 will
also operate at less than 1500 watts.
Typical operating parameters are just
that, not rules, stay within the maximum
values and
everything is fine.
Paul
PAUL HEWITT
WD7S PRODUCTIONS
QRO HOMEBREW COMPONENTS
http://wd7s.home.att.net
-----Original Message-----
From: owner-amps@contesting.com
[mailto:owner-amps@contesting.com]On
Behalf Of Joe Subich, K4IK
Sent: Monday, December 03, 2001 7:44 PM
To: alex; amps@contesting.com
Subject: RE: [AMPS] AL1500
Alex,
> I got the idea from a very special
place :) The tube's Data Sheet that
> recommends a specific set of
operational parameters for SSB AB Class.
> The output is set at 1500W under these
conditions. It somebody is doing
> more than that it means that they do
not respect the manufacturers
> specifications.
Quite simply, you received the "FCC
version" of the spec sheet! The
8877/3CX1500A7 and 3CX800A7 were first
being sampled to the amateur
amplifier manufacturers about the same
time as the FCC was adopting new
type acceptance rules to handle 27 MHz
problem and excess power problem.
In order to avoid redesigning amplifiers
(and/or create new tubes) Eimac
produced new specifications for the
tubes which met the type acceptance
rules for maximum/minimum gain and power
output.
The 8877 will easily produce 2500 watts
output at 100 MHz in class C
service (I also ran an FM transmitter
with one at my first station out
of college). With proper plate voltage
and bias, at 30 MHz the 8877
in class AB2 should easily produce much
more than the "amateur" specs!
73,
... Joe, K4IK
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