[Amps] Source for plate xfrmer

[Carl]

----- Original Message ----- 
From: "Jim Thomson" <jim.thom at telus.net>
To: <amps at 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 at 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