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IF transformers from tube to transistor radios - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: IF transformers from tube to transistor radios
Posted: Wed Jan 17, 2007 8:23 am 
 
General
 

Joined: Fri May 19, 2006 5:01 am
Posts: 55
Location: Netherlands
Hello,

In all tube radios that I've seen, the IF transformers have tuned primary and secondary windings. In transistor radios (where they used IF cans instead of ceramic filters anyway), only the primary is tuned. Why is this?
I can see the obvious advantage, in that you no longer need to "tune" the mutual coupling between the windings, but is this the only reason behind the change? If so, why did they insist on having a tuned secondary in tube radios?

Kind regards,
Charl




Posted  11/12/2012
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