Thordarson 60 watt multimatch "connection" sheet

[K1MVP]

Was wondering if anyone might know where I could find the terminal hookup sheet for a
Thordarson T-21M61,-- 60 watt multimatch modulation transformer.

I have such a sheet for a CVM-1 Stancor 30 watt transformer, and am sure there must be
a similar sheet for the Thordarson indicating the "pinout" for various tube impedance matches.
Any help would be greatly appreciated.

                                                73, K1MVP
                                   

[W1AEX]

I went through my pile of documentation but came up dry for that. I am using a Thordarson CHT 300 watt multi-match in my 811 rig and if I recall correctly, the connection information is inscribed on the cover. Guess they overlooked that luxury on the T-21M61. The only information that turned up in my bookmarks was here:

http://www.amwindow.org/tech/htm/modtran/thordarson/thordarson1.htm

and also here:

http://www.bunkerofdoom.com/xfm/index.html

The bunkerofdoom does have quite a bit of Thordarson information in the format of their service guides and catalogs. Might be worth browsing the pdf archives there.

Are you sure the T-21M61 is a multi-match transformer? The reason I ask is that the 21Mxx series of transformers listed at the first location are all fixed impedance transformers.

Good luck in your search!

Rob W1AEX

[W1AEX]

Ah, looks like you are right, it is a multi-match. It shows up on page 11 of the 1949 catalog located here:

http://www.old-radios.com/Documents/Thordarson1949CatalogFinal.pdf

It does not give much information other than the current ratings with the secondary in series or parallel.

Rob W1AEX

[K1MVP]

Ah, looks like you are right, it is a multi-match. It shows up on page 11 of the 1949 catalog located here:

http://www.old-radios.com/Documents/Thordarson1949CatalogFinal.pdf

It does not give much information other than the current ratings with the secondary in series or parallel.

Rob W1AEX

Rob,
Thanks for the info,--I did come up with an "info sheet" on some older Thordarson multimatch
transformers, of different wattage ratings, which may help.
I am going to attempt to establish the windings ratios by injecting a low level audio frequency
and measure the various voltage ratios to see how it comes out with the info that I have on
some of their previous multimatch transformers.
                                                 73, Rene, K1MVP

[W1AEX]

Sounds like you are on your way Rene. Good luck with the project!

Rob W1AEX