Big old-fashioned IF transformers for tube-type homebrewing?

[Tim Shoppa]

Are the big old-fashioned IF transformers-in-a-can available
anywhere anymore? I want to make a receiver, probably double
conversion,
which would mean that I'd want several each of the 50kHz and some
higher frequency (455kHz likely).

Are these things that can be made from scratch without a lot of
difficutly? I can wind coils etc. but don't
have any transformer slug-tuned cores.

Tim KA0BTD

[Scott Dorsey]

Tim Shoppa > wrote:
>Are the big old-fashioned IF transformers-in-a-can available
>anywhere anymore? I want to make a receiver, probably double
>conversion,
>which would mean that I'd want several each of the 50kHz and some
>higher frequency (455kHz likely).

Try a hamfest, or Antique Electronics Supply.

>Are these things that can be made from scratch without a lot of
>difficutly? I can wind coils etc. but don't
>have any transformer slug-tuned cores.

They are a bloody pain. You should try it. If it was easy, it
wouldn't be fun.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Uncle Peter]

"Scott Dorsey" > wrote in message
...
> Tim Shoppa > wrote:
> >Are the big old-fashioned IF transformers-in-a-can available
> >anywhere anymore? I want to make a receiver, probably double
> >conversion,
> >which would mean that I'd want several each of the 50kHz and some
> >higher frequency (455kHz likely).
>
> Try a hamfest, or Antique Electronics Supply.
>
> >Are these things that can be made from scratch without a lot of
> >difficutly? I can wind coils etc. but don't
> >have any transformer slug-tuned cores.
>
> They are a bloody pain. You should try it. If it was easy, it
> wouldn't be fun.
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."

Getting the bandpass right could be a pain; I'd guess the
sweet spot is near critical coupling, where you'd get a
double-humped response curve. Otherwise, undercoupling
would give you a sharper peak, good for CW, or you'd have
to sweep align the strip for the desired BW.

Pete