On Mon, 15 Mar 1999 16:27:41 -0700 "Michael J. Baker" <K0qz@primenet.com>
writes:
>
>Vic Rosenthal wrote:
>>
>> Goal: 1200-1500 watts CW output, 160-10m. Reliability under CW
>contest
>> conditions is the first priority. Low cost is the second.
>>
>> Tubes: I like the 8877, but pulls are getting hard to find and more
>expensive,
>> and I feel (wrongly?) more comfortable with new tubes. New 8877's
>are
>> outrageously expensive. I am thinking about a pair of 3-500Z's:
>they are
>> available, not too costly, rugged, and instant-on. NOS Eimacs are
>available for
>> $330/pr and RF Parts has their own brand of Chinese tubes for
>$250/pr. Any
>> comments on the RF Parts tubes?
>>
>> The 3CX800A7 and 3CX1200A7 are expensive and not instant-on. Also
>they have
>> somewhat low grid dissipation ratings and I'm afraid of damaging
>them.
>>
> Just a passing thought from a new guy to the reflector, but
>not new to
>homebrew amps.
> Why not consider either one or two 4CX800 by Svetlana? Cost
>is
>reasonable at $190 each and the sockets are only $22 each. Two tubes
>would loaf along at 1500 watts output and the design is nothing new.
Except the added cost/complexity of a bias and screen supply.
Then what do you do years down the road with a tube that is completely
single source from a less than stable country?
Yeah, I know...at that price buy a spare set and dont worry.
For $190 I'll keep buying 8877 medical pulls; at least I have a fairly
comfortable feeling they will be available for a few more years. Plus I
just saved about $200.
Next progression step is some serious SS devices.
73 Carl KM1H
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