Rich, the EFJ T-bolt (2 x 4-400's) is grid-driven and set up for only about
20W drive to run 1kW DC input. If the HV is increased much above 2200V, the
filter cap will definitely require replacement, I'm reasonably sure it's
only a 2500V cap, and the original was oil-filled with lots of nasty stuff,
circa 1958 or so...
WB2WIK/6
"Each success only buys an admission ticket to a more difficult problem." --
Henry Kissinger
> -----Original Message-----
> From: 2 [SMTP:2@vc.net]
> Sent: Tuesday, November 06, 2001 4:47 AM
> To: Bill Russell; AMPS
> Subject: Re: [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.
>
> // 2200v is low for 4-400s running SSB. Is it a G-G config., or
> grid-driven?
>
> >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.
>
> cheers, Bill
>
> - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
> end
>
>
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