[Johnson] Johnson 6n2 Thunderbolt Transformer Amp

[Angelo Glorioso III / N5UXT]

Hi Jerry,

 Thanks for the great break down. I will tell him to wind it to 4800 kv at
550ma..

Angelo

----- Original Message ----- 
From: "Jerry Kincade" <w5kp at direcway.com>
To: "Angelo Glorioso III / N5UXT" <n5uxt at cox.net>; <johnson at mailman.qth.net>
Sent: Thursday, July 22, 2004 9:53 PM
Subject: Re: [Johnson] Johnson 6n2 Thunderbolt Transformer Amp


> Well, just using the bridge rectifier power supply rule of thumb and the
> West Coast Handbook, I'd go with Peter Dahl's specs. If you need 2200V no
> load and 2000 key down, and have a fullwave bridge with choke input
(likely)
> then you will get about 90% of 1/2 of the secondary voltage, or 90% of
> 2400V, or 2160V from the supply under idle conditions. You could
reasonably
> expect that to drop around 10% under key-down, which would put you right
in
> the ball park at near 2000V. Conversly, starting out instead with 4400V,
90%
> of 2200V gets you 1980 at idle, which when keyed would end up at maybe
> 1800V, a tad low.  Also, since you are spending the big bucks anyway, I'd
> get them to wind it for a 650 ma CCS load, if physically possible, and not
> ever have to worry about frying another one - that's if they can fit it
into
> the same core area. Good luck.
> 73, Jerry W5KP
>
> ----- Original Message ----- 
> From: "Angelo Glorioso III / N5UXT" <n5uxt at cox.net>
> To: <johnson at mailman.qth.net>
> Sent: Thursday, July 22, 2004 6:32 PM
> Subject: [Johnson] Johnson 6n2 Thunderbolt Transformer Amp
>
>
> >     Hi Folks,
> >
> >  I am very new to the old time AMPS stuff. I need some help.
> >
> > The Plate Transformer went DOA on my Johnson 6n2 thunderbolt. . I don't
> know
> > the exact volt and amps needed for the rewinding company.
> >
> >  If you look at the Load Chart that is in the manual, it states Plate
> Volts
> > 2.2kv with PC Current of 40ma  no load and 2.0kv Plate Volts at 530 ma
> with
> > load on CW..
> >
> > The Finals are a pair of 4cx250 . The Transformer company figures 4.4kv
at
> > 530ma but when you look at Peter W. Dahl website for his prices, he
> > states the Volts are :
> >
> > JOHNSON 6N2 T-BOLT PLATE
> > T101 PLATE TRANSFORMER
> > PR) 115/230 VAC 60 HZ 1 PH
> >
> > S1) 4800 VCT @ 0.5A CCS
> >
> > Any advise to give the transformer winding company would be appreciated.
> >
> >
> >
> > Thanks,
> >
> > Angelo
> >
> >
> >
> >
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> >
>
>
>