[NJARC] A little radio theory question ...

[Al Schapira]

... concerning interstage audio transformers in TRF sets.

Say you have a UX-200 detector stage transformer coupled to the
following UX-201A stage.
Typically, the transformer ratio is 1:3 or 1:4 (primary:secondary) for
an impedance ratio step up of 9 or 16 to one.

Now, the plate resistance spec for the UX-200 is 30k and the UX-201A
grid is otherwise open and the 201 is usually biased at -4.5 volts.  So
1) How critical is the turns ratio?
2) How critical are DC resistances in the primary and in the secondary?
3) What are typical values for the DC resistances in the primary and
secondary windings?

You guessed it.  I have three TRF sets with open transformers. Anyone
have any to spare?

Thanks.

	-Al, W2ADS
	www.gamma-five.com


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