[R-390] R-390A Cost Reduction and Improvements (was dead horse Hi)

Roy Morgan [email protected]
Wed, 11 Jun 2003 16:05:09 -0400


At 12:37 PM 6/11/03 -0700, Joe Foley wrote:
>Ok, so what's the recipe, ala R-390 style, for an LC
>filter?

Would be coil winders,

Just look at the design and construction of the R-390 non-A IF 
section.  Start there.

Thrree or four stages of very carefully designed, built, and tuned "double 
tuned inductively coupled" IF amplifiers.

See Radiotron Designers Handbook, 4th Edition to get a start on the theory 
and practice. Then see Valley and Wallman's RadLab book: Vacuum Tube 
Amplifiers for stagger tune methods, if you wish.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
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