Hi Tim,

"Tim Wescott" wrote in message
...
Are you talking transistor IF transformers, with one slug each, or tube-
type, with two?

One slug each. I hadn't remembered two two-slug types, but now that I think
about it, I think I have seen them.

Old radio texts. If you still get up to Portland from time to time, dig
through Powell's Technical books.

Good idea, will do.

What are you trying to do? There's good reason for not wanting to have a
circuit with a bazillion tweaks that all have to be right for the thing
to be in tune.

Yeah, although it's kinda a sad commentary that many an "FM receiver" today
doesn't have a tuned front end and, as such, actually performs rather wose
than radios from 30 years ago now, you know?

As for what I'm trying to do... mostly just fully understand how the cheap
little transistor radios they made up until a decade or so ago operated; I
sure couldn't have designed one at the point I graduated from college, and
these days I finally feel as though I'd have a decent shot at it. (On the
other hand, I did feel I could have designed a 6502 when I graduated from
college, and then some fancier superscalar processor by the time I finished
grad school -- so it's not like I didn't get anything out of it.)

(On the other hand, I *have* designed various radio transmitters and receivers
that work well, they were just done more at the MMIC/IC/MiniCircuits-parts
level rather than the "discrete transistor/coupled coil" level -- you know,
the kind of designs industry will actually *pay* you to do. :-) You probably
don't do many PID loops with op-amps anymore I expect?)

Thanks for the help,
---Joel