Bill, I bought my Tbolt used in 1963 and used it for 38 years until I sold it
about two weeks ago. It's obviously a quite reliable amp. It will put out
about 900 watts at saturation when run in Class C. 2200 volts is much lower
than the maximum voltage permitted for 4-400's, but the limitation is in the
stock plate transformer.
I used diodes purchased from K2AW's Silicon Alley to covert the HV supply to
S/S. They were mounted below the chassis, but there are plug in units
available for the 866 tube sockets.
Good luck.
73, Joe
Bill Russell wrote:
> This is my first post to this group and I hope it works!
> I have a Johnson T'bolt, the hf version and have a few questions. Have not
> powered it up as yet as it needs a little work. Nothing serious I hope,
> just the usual for an old piece of equipment. As I get it working, I hope
> to get some comments/advice from members of the group as I go. First I
> would like some general comments about the amp. I hope to use it for mostly
> SSB and some AM. I have heard some comments such as the plate voltage for
> the 4-400's is a little low for the tubes (2200volts) and such. The first
> thing I am going to do is replace the HV rectifiers with solid state and go
> from there. I have a whole bunch of other questions but will stop here for
> now. I am looking forward to getting this thing going and doing any mods
> deemed necessary for reliable operation. Any comments are welcome.
> Bill KC2IFR
>
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