Re: [IRCA] matching transformers for old tube radios

[Nick Hall-Patch <nhp@xxxxxxxx>]

At 23:18 23/11/2007, you wrote:
>I have a bunch of old antique and near-antique tube radios that I would
>like to hook up to my outdoor antennas.  What impedance should I assume
>for the antenna terminals so I can build matching/isolating transformers
>to attach to me coax lead-ins? I know it will probably vary with the
>radio, but what is a good ballpark impedance value to work with?


I believe that these old radios were usually meant to be connected 
directly to a random wire antenna, Bill, so their input impedance is 
high.   Just saw Craig's suggestion, and it is a good one, though 
with some you might find even better signal transfer assuming input 
impedance as high as one or two thousand ohms.

Have fun with these.

best wishes,

Nick



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Nick Hall-Patch
Victoria, B.C.
Canada

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