|[AMRadio] Unusual transformer|
wf2u at ws19ops.com
Sun Oct 22 11:54:17 EDT 2017
Maybe the M refers to the primary impedance, so the secondary would be 5M = 2,500 ohm, to 10M = 5,000 ohm?
Just a thought...
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On Oct 22, 2017, 11:32 AM, at 11:32 AM, Robert Nickels <ranickel at comcast.net> wrote:
>I'm puzzling over a transformer I found in my junk, which is clearly
>identified as a Thoardson T-21M66, but even after finding it listed in
>the 1947 catalog online, I'm still not sure how it was used. It is
>described as a "Matching Line to RF Load Modulation (M) Transformer"
>has a single 500 ohm primary (that would be the "line" part), and five
>secondary taps that are only described as "5M-6M-7M-8M-9M-10M" which
>must be the "RF Matching" part, but darned if I know what these values
>are or how the transformer would be used. The audio power rating is
>watts and the secondary is good for 200MA. A scan of the actual
>catalog section can be seen here:
>I've included the multi-match modulation transformer section above so
>you can see what the column headings refer to. Can anyone shed light
>on what this transformer was used for and what the secondary values
>Thanks and 73,
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