110W drive is a bit hard on a pair of those tubes, that amp is PS limited
anyway. At 80W and 1200W out they will last a long time.
Carl
KM1H
----- Original Message -----
From: "Paul" <w8aef@q.com>
To: "Amps" <amps@contesting.com>
Sent: Tuesday, July 24, 2012 1:12 PM
Subject: [Amps] FS: Alpha 76A with 3CX800A7 tubes
>I have an Alpha 76A equipped with a pair of 3CX800A7 tubes, Vacuum and reed
> relay for qsk operation, and an RF Parts RFC-3 choke that delivers 1500
> watts dc output on all amateur bands, including WARC.
>
>
>
> The 3CX800A7's were new old stock tubes installed in 2001 when I replaced
> the filter capacitors and converted it to QSK operation.
>
>
>
> The amplifier requires about 110 watts drive for 1500 watts output. The
> original plate choke is included if you want to give up 12 meters and only
> have 100 watts for full power output.
>
>
>
> I fabricated transparent dials to replace the 0-100 dial scales on the
> TUNE
> and LOAD controls and inserted a paper dial in back of them with band
> markings similar to the Heath SB-220. This speeds up band change/retuning
> as I do not have to refer to a look up table. The original 0-100 dial
> scales are included and the paper dial can easily be removed to allow
> return
> to factory appearance.
>
>
>
> I am asking $1750, pick up in Phoenix, Arizona
>
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> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
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