----- Original Message -----
From: "Jim Thomson" <jim.thom@telus.net>
To: <amps@contesting.com>
Sent: Wednesday, February 15, 2012 9:15 AM
Subject: [Amps] Source for plate xfrmer
> Date: Mon, 13 Feb 2012 13:35:38 -0500 (EST)
> From: "Steve Bookout" <steve@dx4win.com>
> Subject: [Amps] Source for plate xfrmer
>
> Hello all,
>
> Where do you look for a new HV plate transformer these days?
>
> I understand Peter Dahl is no longer around.
>
> I'm looking for 3000 VAC secondary @ 1+ amp CCS.
>
> TIA
>
> 73 de Steve, NR4M
>
> ## harbach makes and carries the dahl line of xfmr's.
> A 3 kva CCS xfmr will weigh 46 lbs. The next one up from
> that is the 68 lber.[ then the 86/127/168/253/441]
> My 46 lb'er is 27 ohms across the 2750 vac sec.
>
> ## My 253 lb dahl is 3.46 ohms across the 3 kvac sec. And 6 ohms
> across the 5200 vac sec. How much $$ do you want to spend ??
> The bigger they are, the cheaper they get.
>
> ## If you want superb dynamic B+ regulation, get the biggest xmfr you
> can
> afford, then use BIG ga wire back to the main 200A panel..like 6 ga min. I
> use
> 6-8-10 ga wire on these small supplies... and 1-0 and 2 ga on the big
> supplies.
>
> ## Then use some BIG caps. A string of 2500uf @ 450 vdc lytics will
> result in superb regulation. I have caseloads of em if you require
> any..cheap.
> 2" diam x 4" long. 14 oz. 10A CCS ripple current rating. .013 ohm ESR.
> Do it right, and you will be lucky if you can see the B+ meter even
> flinch. Beware,
> the PSUD software assumes a steady state load and not a dynamic load.
> No need for chokes, resonant chokes or CT plate xfmrs, that's all steam
> engine
> technology. Big caps with low esr and a big xfmr, also with low esr and
> big ga wire
> = zero ripple at 120 hz...and all harmonics. The real no load B+ is
> what the B+ is
> when sucking normal idle current. On ssb/cw, it won't drop much below that
> point.
> Your pep output will be a lot higher too.
>
> Later... Jim VE7RF
And so will the 100% kill zone when it lets go (-;
Carl
KM1H
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