It might be the transformer used in an old W.T. LaRose dielectric
preheater. I am not certain of this, but that unit used a 5868, and
it ran on single phase 240 VAC. Here are some examples of what they
looked like. They both use the LaRose 5-6 triode, which was a
relabelled tube. I am not certain if it is the same tube as yours or
if it is the 3CX2500F1 which LaRose also used in some models. I think
those were the 3 phase models however.
The LE400 model ran a maximum of 975 mA of Ip.
http://www.dovebid.com/assets/display.asp?ItemID=tbd192707
The 160C/100 ran 600 mA max Ip.
http://www.dovebid.com/assets/display.asp?ItemID=tbd192695
I don't have a manual and the company is long gone. For parts, you
may find more info at Radio Frequency Company, who bought them out
years ago.
This is just a hunch, that it is a LaRose transformer. Good luck.
John
K5PRO
>Date: Sun, 7 May 2006 16:50:54 -0500
>From: "Larry Carman" <lncarman@swbell.net>
>Subject: [Amps] thp-4 HV transformer
>To: <amps@contesting.com>
>I picked up a very old HV transformer, in good condition, which came from a
>RF heater which ran a 5868/TB4-1250 tube. The model number on the
>transformer is THP-4. I have no idea who manufactured it or when it was
>made. Maybe someone can tell me more about it? When I connect 240 to the
>primary I get a .45 amp primary current draw with no load on secondary. Is
>this typical for very old transformers? The secondary is center-tapped with
>? the secondary winding above the other ? on the core. I get about 4700 VAC
>from center tap to either of the other secondary legs. It weights 46 lbs.
>Maybe this would be a good HV trans for a 4-1000 tube. Any help identifying
>this dinosaur would be appreciated.
>
>Regards,
>
>Larry N5BIP
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