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Old 28th Nov 2010, 3:47 pm   #6
Aerodyne
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Join Date: Jun 2004
Location: Hampton Vale, Peterborough, UK.
Posts: 1,698
Default Re: Single valve receiver circuit required

ECC83 must count as two! - there's also the ECL80 reflex (count as 3!!) from c.1954, but I got the impression (I might be wrong) that a simple battery circuit was wanted.
Les, don't forget the modern 1-valver, from PW c. 1954 and it is also in later editions of Practical Wireless Circuits.

Headphones can be a problem. High resistance types are needed for such circuits, but a step-down output transformer can be used to match modern low impedance types.

Another problem is the RF choke. There are miniature types that look like resistors, available from RS and Farnell but how efficient they are when used in these types of circuit is an unknown to me. You can wind one, but best bet is to search radiojumble at meetings.
If you are stuck for the circuitry of the two sets mentioned, PM me your email address and I'll scan and email them to you.
-Tony
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