UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > General Vintage Technology Discussions

Notices

General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc.

Closed Thread
 
Thread Tools
Old 26th Jan 2004, 4:10 am   #1
jsel84
Retired Dormant Member
 
Join Date: Sep 2003
Location: USA Long Island New York
Posts: 28
Default 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
jsel84 is offline  
Old 26th Jan 2004, 6:03 am   #2
Norm_Leal
Retired Dormant Member
 
Join Date: Jan 2003
Location: Livermore, California, USA.
Posts: 139
Default 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
Norm_Leal is offline  
Old 30th Jan 2004, 10:19 am   #3
jsel84
Retired Dormant Member
 
Join Date: Sep 2003
Location: USA Long Island New York
Posts: 28
Default 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
jsel84 is offline  
Old 30th Jan 2004, 4:35 pm   #4
Norm_Leal
Retired Dormant Member
 
Join Date: Jan 2003
Location: Livermore, California, USA.
Posts: 139
Default 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
Norm_Leal is offline  
Old 31st Jan 2004, 10:45 am   #5
jsel84
Retired Dormant Member
 
Join Date: Sep 2003
Location: USA Long Island New York
Posts: 28
Default 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
jsel84 is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 4:41 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.