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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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26th Jan 2004, 4:10 am | #1 |
Retired Dormant Member
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Location: USA Long Island New York
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IF cans in vintage tube radios 455??
Just a quick question on the IF cans in vintage tube radios
Were they all tuned to 455KC. I was re-tuning a GE tube radio and it was very close to 450Kc I was thinking maybe it was made that way. I heard that the IF cans are tuned too 455. Is this true for all radios in order for them to work correctly. Thanks for any advise on this subject Jim |
26th Jan 2004, 6:03 am | #2 |
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Location: Livermore, California, USA.
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Re: IF cans in vintage tube radios 455??
Hi Jim
No they were not all tuned to 455Kc. Older radios used 175Kc & 256Kc. Later radios used 455, 456, 465Kc and other similar frequencies. Use a frequency that gives the best tracking across the dial. Norm |
30th Jan 2004, 10:19 am | #3 |
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Re: IF cans in vintage tube radios 455??
Thanks Norm
" Use a frequency that gives the best tracking across the dial. " can you expand on this a little |
30th Jan 2004, 4:35 pm | #4 |
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Re: IF cans in vintage tube radios 455??
Hi
Schematics call out frequencies around 455Kc. It doesn't always give the best tracking. Sometimes a slightly different IF frequency is better. A radio oscillator operates the IF Frequency above a received signal. The higher the oscillator frequency the less capacity change required to cover a range of frequencies. If IF is set high so is the oscillator frequency. This compresses the stations closer together on the dial. A low IF Frequency cause stations to be farther apart. By adjusting the IF & oscillator frequency you may get better tracking? Norm |
31st Jan 2004, 10:45 am | #5 |
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Re: IF cans in vintage tube radios 455??
Thanks for the advise. Will try it on some older radios I have.
Keep you posted jim |