> -----Original Message-----
> From: writelog-admin@contesting.com
> [mailto:writelog-admin@contesting.com]On Behalf Of Frank Grossman
> (WB2BXO)
> Sent: Sunday, March 03, 2002 00:31
> To: dx4win@mailman.qth.net
> Cc: writelog@contesting.com
> Subject: [WriteLog] Slightly of-topic; Replacing Linear Amp
>
>
> I'd like to tap into the expertise of DX4WIN and Writelog users on this
> one...
>
> My venerable SB-220 amplifier has finally gone to the big shack in the sky
> after more than 25 years of faithful service. I'm thinking of
> replacing it
> with an Ameritron 811A or 811H. (I can't run a full legal limit amp in an
> apartment)
>
> Several questions:
>
> 1. Is there anything I should know about the Ameritron 811 amps? Known
> design flaws, etc?
>
The biggest thing is to toune it on low paer and then to load it heavily and
that way it will be efficient and the tubes will last. Do not run the grid
curent over 200 MA.
> 2. Do I need Ameritron's "Icom interface" to use the amp with my IC-765?
> Why or why not?
>
I cannot answer this.
> 3. There are two versions of the QSK option--standalone and PC-board.
> What's the difference? (Other than $80-someodd dollars)
>
I do not know.
> 4. What will I need to do for 10 meter operation? Is there a Web
> site with
> details of the mod?
THe is no Web SIte but the dealer will show you. It involes clipping one
wire, it shouod be fairly obvious but best to have somene show you. It works
well on 10 Meters.
Get the 4 tube version 811H, worth the slight extra cost.
>
> Thanks in advance for the bandwidth!
>
I have been pretty happy with nine. The price is amazing. You must be
careful to avoid arcing over buy tuning on low power and try to use a tuner
or a resonant antenna. DO that and it will last I am told. It has the huge
advantage that tuber replacement can be had for around 60 bucks. You can't
even buy the pins on the 8878 or some of those other high class tubes for
that!
The signal is perfectly clean and 15000 pep is only 3 db down form a full KW
which will cost AT LEAST 1000 more. Yes if I could afford a Henry 2k or the
like I might buy it but I don't know if many could tell the difference in my
signal?
> 73,
> Frank
>
>
>
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