I agree with Steve on all counts. The fan bearings will go without periodic
lubrication. Replacement fans can often be found at hamfests though.
73, Joe
Steve Katz wrote:
> Be careful of the HV filter cap, Bill. With SS rectifiers, you may exceed
> its rating. It's likely so old that it needs replacement, anyway, but as I
> recall, EFJ only used a 2500V oil-filled cap (mounted horizontally, beneath
> the chassis -- wonderful service location for a 140 pound amplifier). Oil
> the blower and make sure it spins freely. Obviously, be careful about your
> keying interface.
>
> Use that amp on 230V only...on 115V, it draws about 20A, which will overload
> your circuit as a near certainty.
>
> Oh, and rest your back for a few hours after each moveabout of the
> Thunderbolt. Unless you're Arnold Schwartzenegger, the damned thing is
> awfully heavy.
>
> WB2WIK/6
> "Each success only buys an admission ticket to a more difficult problem." --
> Henry Kissinger
>
> > -----Original Message-----
> > From: Bill Russell [SMTP:willy@global2000.net]
> > Sent: Tuesday, November 06, 2001 3:28 AM
> > To: amps@contesting.com
> > Subject: [AMPS] Thunderbolt questions
> >
> >
> > 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
> >
> >
> >
> > --
> > FAQ on WWW: http://www.contesting.com/FAQ/amps
> > Submissions: amps@contesting.com
> > Administrative requests: amps-REQUEST@contesting.com
> > Problems: owner-amps@contesting.com
>
> --
> FAQ on WWW: http://www.contesting.com/FAQ/amps
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
--
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