My feeling is that any 811A amp is a bad choice for RTTY. The 811A has only
65 Watts dissapation per tube and RTTY is a continuous carrier signal. The
AL-811 is not an overly efficient amp so the maximum safe output would be a
bit over 200W.
You would be far better off getting a used 3-500Z amp such as the SB-220,
TL-922, AL-80A, SB-1000, LK-450, L-75, etc. With 45W of drive any of those
will do a comfortable 450-600W out on RTTY.
----- Original Message -----
From: "EP Swynar" <email@example.com>
To: <firstname.lastname@example.org>; "Amps Reflector " <email@example.com>
Sent: Sunday, August 26, 2007 1:08 PM
Subject: Re: [Amps] Future Amp Buyer Questions
> Hi Zack,
> My best advice for you would be --- first, and foremost --- to READ as
> about RF amplifiers as I could, from any & all sources, BEFORE deciding
> which one to buy, or (heaven forbid!) which circuit / tube(s) to use in a
> homebrewed creation...
> With just that latter option in mind, the three part Bill Orr (W6SAI)
> series, which was featured in the late 70's HAM RADIO magazine, would
> certainly be a good place to start, IMHO.
> ~73!~ Eddy VE3CUI - VE3XZ
> ----- Original Message -----
> From: <firstname.lastname@example.org>
> To: "Amps Reflector " <email@example.com>
> Sent: Sunday, August 26, 2007 12:39 PM
> Subject: [Amps] Future Amp Buyer Questions
> I am seriously considering buying an amp in the very near future.
> My antenna will be a Steppir BigIR & 80 meter coil both of which are
> currently on order. Wish that I
> could put up a beam but it is impossible in my circumstances (money,
> XYL, etc). The rig will be
> a Flex-5000, also on order. Currently I have a Bencher YA1 low pass filter
> inline along with a
> LP-100 digital wattmeter from N8LP.
> BTW I am leaning towards the Ameritron AL-811 or Al-811H mainly based on
> price and reviews on
> One of my reasons for wanting an amp is that the rig I am getting will
> put out 45 watts on RTTY.
> Another is wanting that extra power for times when 100 watts on CW or SSB
> will just not cut it.
> However I don't expect it to be a miracle worker with a vertical.
> Anyways here are my questions.
> Are there any other amps in this price class that you would suggest?
> If the amp is turned off can I transmit through it or is some external
> switching needed? If it is in
> standby can I transmit through it without utilizing the amp?
> Are there any good instructions on using a AL-811(H)? on the web? The
> from Ameritron is
> kind of minimal.
> Does anyone on the list have any good tuning or usage tips for these amps?
> Is there any advantage to using the AL-811H on 220VAC?
> Are there any accessories that I really should get? Are pulsers worth it?
> Which one would you
> suggest getting?
> Any information on the above will be greatly appreciated!
>> Amps mailing list
> Amps mailing list
Amps mailing list