I have a transformer from a late 60's vintage Henry 2K-3 amplifier here, and
it weighs 63.5 lbs. Although your transformer is from te 1950's, I wouldn't
imagine that there is more than 10% difference between the weight of a
1950's transformer and a late 1960's transformer of similar power
capability. Hence your transformer, probably close to 50% bigger than the
"heavy duty standard" transformer for a choke input power supply that most
of us know about, is probably about 50% more capable than this one. I
suggest using the transformer you have in capacitor input configuration. In
intermittant service it will probably probably loaf nicely at 4 KV and
0.6-0.8 A for RTTY service, based on its weight. Just make sure some
airflow is present.
----- Original Message -----
From: "John T. M. Lyles" <jtml@lanl.gov>
To: <amps@contesting.com>
Sent: Tuesday, March 21, 2006 5:39 PM
Subject: [Amps] Big transformer request TSPA
> Before I start searching for 3 KVA pole pigs I will ask here. I have
> a UTC LS-184, a beautiful transformer from the 1950s, weighs 102 lbs.
> It is 7 kV RMS CT. With a choke input, it would do a 3 kV DC 500 mA
> supply all day long, according to UTC. I need ~ 4 kV at 0.6 - 0.8
> Amps. If I ran it into a capacitor only, and it charged up to near
> peak, it should do the voltage fine. However, I am not certain how
> much current derating it would need for running into a Capacitive
> load.
>
> Does anyone have a single phase plate transformer, which has 220/240
> primary and good for ~4 kV DC @ 0.6-0.8 Amps? I would prefer to us a
> full wave bridge but two diodes and a center tapped pig would work
> too. I just found a 4.1 kV @ 2 Amp today at a junk yard in town, but
> it has 480 VAC primary, and is LARGE. I have several pieces for 3 kV
> DC supplies, but nothing for a higher voltage tube. Numerous
> broadcast transmitters and RF industrial generators used such power
> in the good old days.
>
> There were some very nice 3 kVA 4160VAC/220 dry distribution
> transformers made by Westinghouse years back, before ABB bought them,
> and they outsourced to China. Into a choke, they would be fine. I am
> not planning on using this for SSB.
>
> Thank you.
> 73
> John
> K5PRO
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