I would certainly replace the electrolytic capacitors in the screen and
bias supplies. I lost one when my T'Bolt was relatively new.
Yes, the plate voltage is low and, as I recall, the plate tuning cap is
quite close spaced. There are probably other components that are rated
right on the edge. That is why I never converted to solid state
rectifiers. I did dump the 866As in favor of 3B28 jugs, however.
Damned bean counters kept that amp from being a real barn burner.
I used to run mine occasionally on AM with a Ranger as the driver.
About all I can remember about it was that it generated an ungodly
amount of heat! Good luck with your project.
73,
Ken K4XL
k4xl@arrl.net
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> 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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