On 6/27/19 11:46 AM, Ted Rachwal wrote:
All of a sudden I have a very high swr between the rig and
amp...3:1.... I notice one of the 3500Z tubes is not lit. I'm
wondering if I can pull the unlit 3-500Z and try the amp to see if the
issue is the tube or some other part. I have pulled a suspect 572b
and 811 in the Ameritron series of amp and all was ok but wonder if
the remaining 3-500Z would be damaged if I tried this trick? Anyone
have a thought here?
73,
Ted K8AQM
Ted,
Adding to my previous post... I got curious about the original amp and
managed to find a schematic for it.
The tube filaments are in parallel on the original 2K or 2KD or 2KR, so
you could run on one tube, but the L/C ratio, etc, would be incorrect.
If you have a 2K-2 or later, it has series filaments, so you can not run
on one tube.
73 de Jim, W2XO
If you have a later version (2K-2 or later), the filaments are in
series, so you can't operate with one tube.
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