[R-390] R390A design improvement
rbethman
rbethman at comcast.net
Mon Feb 21 10:37:21 EST 2011
I never bother to try and go the path of Ping for clubs.
The Sears option was never considered.
Since I don't participate in "contests", as I despise them, competition
grade is pretty meaningless to me.
I long ago downloaded the Y2KR3.
Bob - N0DGN
On 2/20/2011 9:25 PM, Perry Sandeen wrote:
> List,
>
> Great question. OK, below is at least a partial answer.
>
> Using tubes that did not exist at the time of the original design: The R390A Receiver: A Milestone in HF Communications: Part Three The "Competition-Grade" R390a by Ray W. Osterwald N0DMS Originally Published in E.R Magazine. Also see Cheaper and Simpler Upgrades for the R-390A HF Receiver E.R. 8/04 by Chuck Felton.
>
> Also in the Y2KR3 anthology are several audio improvement circuits including one by Dallas Lankford.
>
> I’m emailing you an updated copy of both articles. If any others would like a copy please reply off list.
>
> <snip>
> Regards,
>
> Perrier
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