I have a homebrew 4-1000A amp I built a couple of years as well. I standing by
for the source of 3-1000Z tubes as well.
Thanks
Mike-KK4MS
a_borg@yahoo.com
--- On Fri, 7/3/09, Kevin LaHaie <klahaie@centricata.com> wrote:
> From: Kevin LaHaie <klahaie@centricata.com>
> Subject: [Amps] 4-1000A in LK2000
> To: "Amps@contesting.com" <Amps@contesting.com>
> Date: Friday, July 3, 2009, 1:56 PM
> I have a change to pickup up a good
> condition BTI LK2000 floor console
> amplifier. It has the heavy duty power supply (but is
> not labeled as an
> HD), includes the DL-2000 dummy load so it is a complete
> example of this
> cool amp, and was built in 1969.
>
> This amp still has the original 3-1000z, and after all
> these years in
> contest service, it can still put out about a KW, but
> obviously well
> down from the factory specs. (I have the original documents
> that came
> with the amp)
>
> The documentation claims that the 4-1000a can be also be
> used, and I
> have a handful of them. Per the manual, the only mod
> required is to
> shorten the plate cap a bit since the 4000 is a bit taller.
> I had a
> spare HC8 cap, so I performed the mod and tried several
> tubes, but my
> issue is high input SWR. The tuned input range is not
> adequate to
> provide a low input SWR, so the exciter only puts out about
> 50 watts,
> resulting in output power of only 3-400 watts depending on
> the band.
> Not acceptable.
>
> I haven't put it behind the trusty TS-830S with the Pi
> network in the
> finals, which would drive it fine, but that is not what I
> hope to use
> with this amp.
>
> Is the input impedance that different from the 3-1000?
>
> I was hoping to get decent performance with the stash of
> 4-1000a's I have.
>
> Does anybody know of a source for 3-1000z's? If so,
> let me know. It
> will influence my decision to acquire this amp.
>
> 73 Kevin K7ZS
>
>
>
>
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