[Johnson] Johnson 6n2 Thunderbolt Transformer Amp

[Jordan Arndt]

I'd still try for the 650 mA transformer...a pair of 250B's can pull 500 mA
pretty easily...73 de Jordan....

Angelo Glorioso III / N5UXT wrote:

> WOW !! Larry. That would be one big transformer. Thanks for the correction.
>
> Angelo
>
> ----- Original Message -----
> From: <telegrapher at att.net>
> To: "Angelo Glorioso III / N5UXT" <n5uxt at cox.net>
> Sent: Friday, July 23, 2004 10:47 AM
> Subject: Re: [Johnson] Johnson 6n2 Thunderbolt Transformer Amp
>
> > Oh no!!!!  Not 4800 kv, 4.8 Kv or 4800 Volts... Big difference from 48
> > KV......
> >
> > Larry
> > W0OGH
> >
> >
> > Angelo Glorioso III / N5UXT wrote:
> > >
> > > 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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> > > >
> > > >
> > > >
> > >
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