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Radiola 61-2

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09-02-2015, 12:15 PM

wa2ise

VideoKarma Member

Join Date: Dec 2002

Location: USA

Posts: 3,147

Quote:

Originally Posted by DavGoodlin

That is a rare circuit, using a 12J5 for an oscillator.

Why did they do that, vs just use a 12SA7 pentagrid converter? Can't imagine that that would offer any performance improvement of significance for an AM radio. Avoiding patent infringement? Or they just had a ton of 12SG7s and 12J5s to use up?

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