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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