[Johnson] Johnson 6n2 Thunderbolt Transformer Amp

[Jerry Kincade]

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
>
>
>
>
> Johnson mailing list
> Home: http://mailman.qth.net/mailman/listinfo/johnson
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Johnson at mailman.qth.net
>