The Alpha76A runs triodes-8874s(3cx400s) Tetrodes are not a match. Sorry.
On Sun, Oct 14, 2018 at 5:18 PM Larry Dighera <LDighera@att.net> wrote:
>
>
> Hello Jeff,
>
> Tubes are an issue for the 87A as well; that's for sure. Here are
> some tubes to consider:
>
> NEW GS-36B/4CX400A Tube, Tetrode, Russian
> https://www.rfparts.com/catalogsearch/result/?q=GS-36B $174.95/each.
>
> New old stock GS-36B tetrode
> https://www.ebay.com/itm/263803841869 US $49.00/each.
>
> Hope that helps return your venerable 76A to operational status.
>
> Best regards,
> Larry
>
>
> On Sun, 14 Oct 2018 01:36:33 +0000 (UTC), <tz4am@aol.com> wrote:
>
> >Larry:
> >I have an Alpha 76A but have never succeeded in getting a good set of
> tubes for it.
> >I like the KPA1500 but am hesitating for the same reason: price
> >Instant-on and 6 meters are a big draw for me too.
> >73,
> >JeffTZ4AM/K1MMB
> >
> >
> >-----Original Message-----
> >From: Larry Dighera <LDighera@att.net>
> >To: Amps <Amps@contesting.com>
> >Sent: Fri, Oct 12, 2018 12:00 pm
> >Subject: Re: [Amps] KPA1500 in QSK mode
> >
> >
> >Hello Bob,
> >
> >I've been considering replacing my Alpha 87A
> ><http://kj6yvt.com/amplifier.htm> with an Elecraft KPA1500 too. The
> >instant-on feature solid-state amplifiers offer is attractive to a
> >fellow who hates to wait, and the 6 meter support and built-in antenna
> >tuner are what have lead me to this. The KPA1500's $5,995.00 price
> >tag is about double what I paid for my used 87A, and my 87A is
> >integrated with the Alpha DAS antenna selector relay control box, so
> >I'm still on the fence.
> >
> >Thank you for posting the Alpha 87A memory dump procedure
> ><https://www.kkn.net/~n6tv/Alpha_87A_Memory_Dump.pdf>. That is
> >something all 87A owners will appreciate.
> >
> >And I very much enjoyed your extensive 2018 Visalia International DX
> >Convention photo album <https://bit.ly/Visalia2018>.
> >
> >Best regards,
> >Larry Dighera
> >WB6BBB
> >
> >
> >On Tue, 9 Oct 2018 23:45:07 -0700, "Bob Wilson, N6TV" <n6tv@arrl.net>
> >wrote:
> >
> >>Mickey,
> >>
> >>I just used a pair of KPA1500s in the California QSO Party, full bore, CW
> >>only, for 24 hours. The performance was solid, no glitches. QSK was
> >>silent and fast, so it's safe to use a K3 transceiver in CW QRQ mode
> (about
> >>4.3 ms PTT to RF delay, maximum QSK performance). Fan noise was not a
> >>problem while wearing David Clark headphones. I manually set the fan
> level
> >>to a minimum value of 2 (out of 5) which is pretty loud, but it kept the
> >>temperature below 62°C, so the amp. never kicked into a higher fan speed.
> >>I'm running a beta version of the firmware (1.78).
> >>
> >>Though I use two K3s, the KPA1500 amp/tuner combo. can automatically
> track
> >>your 6600M frequency (see the USB Cables section in the Flex Manual).
> You
> >>can use the XCVR SERIAL port on the KPA1500 for this. The S-BOX
> >><https://bit.ly/S-BOX> makes that connection easy using standard serial
> and
> >>TRS cables, no custom cables required. (The S-BOX can also do this for
> SPE
> >>and ACOM amps).
> >>
> >>My Alpha 87As are now for sale.
> >>
> >>73,
> >>Bob, N6TV
> >>
> >>On Mon, Oct 8, 2018 at 5:28 AM Mickey Baker <n4mb@arrl.net> wrote:
> >>
> >>> I have a fairly new 6600M and once had the PowerGenius on order, but
> >>> cancelled after it was delayed and my transceiver was ready.
> >>>
> >>> I'm thinking that the Elecraft KPA1500 is the only full power solid
> state
> >>> amp with qsk that can replace my AL1500 with QSK5.
> >>>
> >>> Thoughts from the group?
> >>>
> >>> Mickey Baker, N4MB
> >>> Fort Lauderdale, FL
> >>> *“Tell me, and I will listen. Show me, and I will understand. Involve
> me,
> >>> and I will learn.” *Teton Lakota, American Indian Saying.
> >>>
> >>_______________________________________________
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> >>Amps@contesting.com
> >>http://lists.contesting.com/mailman/listinfo/amps
> >_______________________________________________
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>
--
Later,
John Bodine/WU2E
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