[R-390] Z503 Question

[rbethman]

I've gotten one dtd 1963. It is labeled on one flat side of the can 
cover: AMELCO, INC. The opposite flatside is marked AMERICAN - TRANS - COIL
Richmond Hill, L. I., N.Y.

So it wasn't only Art.

I have to say that whenever I take a can cover off, (Only two - both on 
the IF deck.), that these would be very difficult to make by ourselves. 
It is a PI-Wound coil, and has a resin around and over it - PLUS - it 
has a ferrite cup that the resin is holding on VERY dearly with.

Bob - N0DGN

On 3/15/2011 12:50 AM, Perry Sandeen wrote:
> List,
>
> Other than the fact that Art made it, it is failure prone, and unobtanium what makes Z503 so special?  If it was a transformer that would make some sense.   But other than perhaps having a high-Q why can’t it be replaced with another variable inductor and capacitor combination?
>
> Regards,
>
> Perrier