[AMRadio] Thordarson Transformer ID

Merz Donald S merz.ds at mellon.com
Mon May 24 12:00:11 EDT 2004

This design was the so-called "CHT" series from the 1930's. "CHT" was Mr. Thordarson's initials and these were supposed to be his "signature quality" transformers. I think I have some info on these. But there was a whole line of them. Without any tag, there is probably no way to ID which one you have except scoping out the windings, applying a test voltage and checking the outputs.

Let me know if you want a copy of whatever I have on these.

73, Don Merz, N3RHT

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net]On Behalf Of David Knepper
Sent: Monday, May 24, 2004 11:38 AM
To: collins at mailman.qth.net; amradio at mailman.qth.net
Subject: [AMRadio] Thordarson Transformer ID

I have a very large high voltage Thordarson transformer that appears to be a PUV type.  There are no identification labels, etc. but the original owner did identify it as a Thordarson.

The end bells have slotted "handles" to move the transformer around.  Never have seen this before.

The high voltage connectors are very unusual in that they are meant to be used with plug type connectors that slip into the white porcellin insulators.

There are 10 of these, with five in a row vertically.   I suspect that this transformer was manufactured in the 1950's or so.

The primary side has four terminals.  The original owner told me that it was for 120 volts AC.

Can anyone help in identifying this unit.

Thank you.

Dave, W3ST
Secretary to the Collins Radio Association
Publisher of the Collins Journal
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