Hi Phil,
You are claiming that two 8660 tubes drive another pair of 8660 tubes?
The original posting meant eventually that the output network should be
adjusted for the power to be operated and not to that the tubes are capable
of.
That does not mean that parts could not be oversized.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Phil Clements
Sent: Freitag, 26. Mai 2006 18:18
To: garyschafer@comcast.net; amps@contesting.com
Subject: Re: [Amps] Quad Tube 4cx800 hf amp
> Moral of the story: Build the amp for the capability you are going to use
> it> at. Not for what it could be operated at.
>
I strongly disagree with that advice.
Harris had a large contract with the Navy to build an amp that was to be
mounted deep into the bowels of ships and operated in a no-time-limit, 1000
watts output on RTTY, and all other modes. Another challenge was that it was
to be "no-tune" from 2-30 mhz with no gaps in that range. Intermodulation
products needed to be down 40 db below full rated output in all modes. It
needed to be as idiot-proof as possible, and easy to repair. (.5 hours mean
time to repair) It needed to operate in ambient temperatures up to 50
degrees C.
The product was the RF-110A, which exceeded all the expectations, and then
some. Hundreds, if not thousands were produced. I have two of them in
operation here. They are over 20 years old, and have all the original parts
and tubes. Two 8660 tubes, with an anode voltage of 500 v boost the RF input
power of 100 mw to 10 watts to drive a pair of 4CX1500B's. If you look up
"headroom" in the dictionary, there should be a picture of the 110A there!
(((73))))
Phil Clements, K5PC
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