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

[J. Forster]

Thanks very much,

-John

=================



> 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.)
>
>