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
You say "2K". I have a 2K-2. The tube filaments are in series. The amp
will not run at all with one tube pulled. I believe this is the case for
all the 2K series.
If you actually have a 2K (the original amp from the 60's) it would have
tube type rectifiers and 3-400Z's as finals.
A 2K-2 would have 3-400Zs and a 2k-3 would have 3-500Zs.
Henry did some unusual stuff. The 2K-2 I own actually had all the
factory mods for a 2K-3 but did use 3-400Zs. I dropped the sockets so
that it is really a 2K-3 now. Filaments are in series as with the 2K-2.
Wonderful amps.
73 de Jim, W2XO
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