Given the current draw expected by each transformer that would be a rather
large variac I would think. Isn't just wiring the two in series a better plan?
I'm trying to imagine the weaknesses of doing that and I can't think of any.
Anyone educate me on what I'm missing? MarkDe wa3jpy
-------- Original message --------From: Roger - W7TZ <ai7rogerroger@gmail.com>
Date: 10/22/25 1:36 PM (GMT-05:00) To: amps@contesting.com Subject: Re:
[Amps] Amps Digest, Vol 274, Issue 8 Measure the outputs of each transformer,
put a variac on the input of thehigher output xfmr and adjust till the outputs
are the same. Now you cantie the outputs together in any fashion.73,
RogerW7TZCN83iaOn Wed, Oct 22, 2025 at 9:23 AM clark clarkturnertuning.com
<clark@clarkturnertuning.com> wrote:> I agree with Steve. I have done this in
the past but noticed one running> warmer than the other. It worked for me and
will work this way, But it> bothered me. They won't be exactly the same.
Another way is to rectify> each transformer, then combine that with resistors
and off to the caps.> Any imbalance will be handled.>> C>>
________________________________> From: Amps <amps-bounces@contesting.com> on
behalf of> amps-request@contesting.com <amps-request@contesting.com>> Sent:
Wednesday, October 22, 2025 9:00 AM> To: amps@contesting.com
<amps@contesting.com>> Subject: Amps Digest, Vol 274, Issue 8>> Send Amps
mailing list submissions to> amps@contesting.com>> To subscribe or
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Topics:>> 1. Re: 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 34>
(Steve Harrison)> 2. Re: 12 KW CCS ON 160-15M....USING THE
3CX-6000A7..... PART 34> (hzp_electronics@juno.com)>>>
---------------------------------------------------------------------->>
Message: 1> Date: Tue, 21 Oct 2025 15:48:40 -0700> From: Steve Harrison
<k0xp@k0xp.com>> To: amps@contesting.com> Subject: Re: [Amps] 12 KW CCS ON
160-15M....USING THE 3CX-6000A7.....> PART 34> Message-ID:
<abff03f3-0c19-461b-8ec6-6d9d5da9239b@k0xp.com>> Content-Type: text/plain;
charset=UTF-8; format=flowed>> On 10/20/2025 6:50 PM, jim.thom
jim.thom@telus.net wrote:> > Secondary wiring now completed. The 2 x 5300
vac secondary's are also> > wired in parallel with GTO-15 HV wire...(15 kv
AC rated, and uses> 14> > ga stranded wired).>> I think I would have rathered
wired them in series, because you can bet> that those transformers do NOT have
exactly the same output voltage as> one another. Thus, by wiring them in
parallel, you are going to have one> of them bucking or boosting the other
transformer, causing them both to> draw more idling current as well as
dissipating useless power internally> due to the bucking-boosting. By wiring
them in series, that won't> happen, and the one at the "high end" of the
5300-volts would still have> that same voltage if wired in parallel. That's how
I wired a pair of> pole pigs for a good friend of mine some years back. He
first attempted> connecting them in parallel but had them drawing well over ten
amps just> idling that way. In series, that dropped down to less than an amp or
so.> This is less of a problem with smaller transformers simply because the>
current draw, when they are very-slightly mismatched, is much less and>
generally more-withstandable. But try putting an ammeter between them> and
you'll easily find the difference.>> Steve, K0XP>>>>>
------------------------------>> Message: 2> Date: Wed, 22 Oct 2025 15:09:57
GMT> From: "hzp_electronics@juno.com" <hzp_electronics@juno.com>> To:
k0xp@k0xp.com> Cc: amps@contesting.com> Subject: Re: [Amps] 12 KW CCS ON
160-15M....USING THE 3CX-6000A7.....> PART 34> Message-ID:
<20251022.110957.9722.0@webmail04.vgs.untd.com>> Content-Type: text/plain;
charset=UTF-8>>> Nothing is free. Putting the secondaries in series> and
primaries in parallel doubles the primary to secondary voltage> insulation
requirement.> 73> .... Bill K3HZP>>> ---------- Original Message ---------->
From: Steve Harrison <k0xp@k0xp.com>> To: amps@contesting.com> Subject: Re:
[Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART> 34> Date: Tue,
21 Oct 2025 15:48:40 -0700>> On 10/20/2025 6:50 PM, jim.thom jim.thom@telus.net
wrote:> > Secondary wiring now completed. The 2 x 5300 vac secondary's are
also> > wired in parallel with GTO-15 HV wire...(15 kv AC rated, and
uses> 14> > ga stranded wired).>> I think I would have rathered wired them in
series, because you can bet> that those transformers do NOT have exactly the
same output voltage as> one another. Thus, by wiring them in parallel, you are
going to have one> of them bucking or boosting the other transformer, causing
them both to> draw more idling current as well as dissipating useless power
internally> due to the bucking-boosting. By wiring them in series, that won't>
happen, and the one at the "high end" of the 5300-volts would still have> that
same voltage if wired in parallel. That's how I wired a pair of> pole pigs for
a good friend of mine some years back. He first attempted> connecting them in
parallel but had them drawing well over ten amps just> idling that way. In
series, that dropped down to less than an amp or so.> This is less of a problem
with smaller transformers simply because the> current draw, when they are
very-slightly mismatched, is much less and> generally more-withstandable. But
try putting an ammeter between them> and you'll easily find the difference.>>
Steve, K0XP>>> _______________________________________________> Amps mailing
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