Can I use the 3/4" square I.F. transformers from 50"s and 60"s printed Circuit Board radios in the 30"s and 40"s radios that have 1 3/8" square I.F. transformerts?
Thanks for any info. Ken

Hi Ken

Yes, if the IF Frequency is the same. The smaller ones will usually be 455-465KC. Older radios also used these frequencies but some used 262, 175 and others.

Norm

: Can I use the 3/4" square I.F. transformers from 50"s and 60"s printed Circuit Board radios in the 30"s and 40"s radios that have 1 3/8" square I.F. transformerts?
: Thanks for any info. Ken

: Hi Ken

: Yes, if the IF Frequency is the same. The smaller ones will usually be 455-465KC. Older radios also used these frequencies but some used 262, 175 and others.

: Norm

: : Can I use the 3/4" square I.F. transformers from 50"s and 60"s printed Circuit Board radios in the 30"s and 40"s radios that have 1 3/8" square I.F. transformerts?
: : Thanks for any info. Ken

Norm
How can I tell what the frequencies are? Should they be marked on the can?

Ken

Usually not marked on the can but should be on the schematic. Nostalgiaair has most of the early schematics. Early superhets used all kinds of lower frequencies. By 1940 most went to 455-465 except car radios.

If you have an open IF Transformer here is something you can do. Add a resistor across the open winding. Use 22K if it's the plate winding. Higher if the grid side. Connect a 100pf cap from the plate of the driving tube to grid of driven tube. This will make the radio operate.

Norm

: : Hi Ken

: : Yes, if the IF Frequency is the same. The smaller ones will usually be 455-465KC. Older radios also used these frequencies but some used 262, 175 and others.

: : Norm

: : : Can I use the 3/4" square I.F. transformers from 50"s and 60"s printed Circuit Board radios in the 30"s and 40"s radios that have 1 3/8" square I.F. transformerts?
: : : Thanks for any info. Ken

:
: Norm
: How can I tell what the frequencies are? Should they be marked on the can?

Where can I find the 455 KHz I.F. Transformers used in the 50's and 60's radios? I tried eBay and electronics specialists but I am not exactly sure what to look for.

I was considering building the transformers myself. Would anyone know how many turns are needed on each side to make a standard 455 KHz I.F. transformer?

Any info would be more appreciated. Thanks!!!

ernie_werbel@hotmail.com

: Ken

: Usually not marked on the can but should be on the schematic. Nostalgiaair has most of the early schematics. Early superhets used all kinds of lower frequencies. By 1940 most went to 455-465 except car radios.

: If you have an open IF Transformer here is something you can do. Add a resistor across the open winding. Use 22K if it's the plate winding. Higher if the grid side. Connect a 100pf cap from the plate of the driving tube to grid of driven tube. This will make the radio operate.

: Norm

: : : Hi Ken

: : : Yes, if the IF Frequency is the same. The smaller ones will usually be 455-465KC. Older radios also used these frequencies but some used 262, 175 and others.

: : : Norm

: : : : Can I use the 3/4" square I.F. transformers from 50"s and 60"s printed Circuit Board radios in the 30"s and 40"s radios that have 1 3/8" square I.F. transformerts?
: : : : Thanks for any info. Ken

: :
: : Norm
: : How can I tell what the frequencies are? Should they be marked on the can?