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IF transformers from tube to transistor radios - RF Cafe Forums
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| Charl
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Post subject: IF transformers from tube to transistor radios
Posted: Wed Jan 17, 2007 8:23 am
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Joined: Fri May 19, 2006
5:01 am
Posts: 55
Location: Netherlands
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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
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Posted 11/12/2012
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