[Milsurplus] [Vintage-Military-RADAR] Re: Plug-In for APR-4 or What?

Mike Hanz aaf-radio-1 at aafradio.org
Fri Nov 29 15:17:45 EST 2013


On 11/29/2013 3:02 PM, J. Forster wrote:

> Thanks. Do you know if it is ONLY for the -4Y, or will it work in the -4
> and/or the 4X ?

Backwards compatible to the earlier equipment including the AN/APR-1. 
Any of that line that provided 28vdc to the plug-in.

> Also, how does it compare with the mechanically tuned (butterfly
> capacitor) TN-xxs for selectivity an NF?

*Significantly* better - uses later subminiature tubes (6AF4 for 
oscillators and and 5654 for both RF amps and mixers.)



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