Hey, I wonder if a friendly visit or call to the Local Chapter of SBE (Society
of Broadcast Engineers), could result in a look in their storage sheds, for an
old Tube Broadcast TX power supply, that runs 24/7 for, say, a 2 kw FM
broadcast TX. I bet such a P/S transformer would be a beast for those used to
seeing ham QRO Supplies.
SBE has websites, with Local chapter information listed. Invite a Broadcast
Engineer to talk at your Radio Club Meeting.
I saw that almost happen a number of years ago. A local station in Carmel
(near Monterey CA) had a bunch of junk overflowing the outdoor storage shed,
that could have been picked through.
73, de Pat AA6EG
> From: firstname.lastname@example.org
> To: email@example.com; firstname.lastname@example.org
> Date: Wed, 15 Feb 2012 10:16:24 -0500
> Subject: Re: [Amps] Source for plate xfrmer
> ----- Original Message -----
> From: "Jim Thomson" <email@example.com>
> To: <firstname.lastname@example.org>
> 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" <email@example.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 (-;
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