[Amps] Amps Digest, Vol 274, Issue 8

Wed Oct 22 13:35:44 EDT 2025

Measure the outputs of each transformer, put a variac on the input of the
higher output xfmr and adjust till the outputs are the same. Now you can
tie the outputs together in any fashion.

73, Roger
W7TZ
CN83ia

On Wed, Oct 22, 2025 at 9:23 AM clark clarkturnertuning.com <
clark at 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
>
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> Sent: Wednesday, October 22, 2025 9:00 AM
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> Subject: Amps Digest, Vol 274, Issue 8
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> Today's Topics:
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>    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 at juno.com)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Oct 2025 15:48:40 -0700
> From: Steve Harrison <k0xp at k0xp.com>
> To: amps at contesting.com
> Subject: Re: [Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7.....
>         PART 34
> Message-ID: <abff03f3-0c19-461b-8ec6-6d9d5da9239b at k0xp.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 10/20/2025 6:50 PM, jim.thom jim.thom at 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 at juno.com" <hzp_electronics at juno.com>
> To: k0xp at k0xp.com
> Cc: amps at contesting.com
> Subject: Re: [Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7.....
>         PART 34
> Message-ID: <20251022.110957.9722.0 at 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 at k0xp.com>
> To: amps at 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 at 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
>
>
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> End of Amps Digest, Vol 274, Issue 8
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