Re: [IRCA] matching transformers for old tube radios

[Rick Kunath <k9ao@xxxxxxxxxxx>]

Nick Hall-Patch wrote:

> 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.

The old SAMS schematics and Ryder manuals often had the factory 
alignment instructions in them for the radio model. Lots of sets tell 
you you put a network of impedances and a resistor across the antenna 
terminals before connecting a signal generator aligning the front end to 
simulate the expected antenna.

You should be able to use this info to see what impedance ratio you 
might need don any matching transformer.

Rick Kunath
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