[R-390] Regulated B+ supply R-390A

[David Wise]

According to the Cost Reduction Report, they chose operating points and circuit constants that would minimize the amount of regulation necessary.  They winnowed it down to some screen grids, which they put on the 0A2.  The rest, as demonstrated, is not sensitive.

Dave Wise

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Charles Steinmetz
Sent: Sunday, January 19, 2014 11:18 AM
To: 390 list
Subject: Re: [R-390] Regulated B+ supply R-390A

Tom wrote:

>If one were to build a regulator for an A model what do you all feel the
>optimum B+ should be

 From one of my previous posts (not a recommendation, but some information):

>I once built a 390A for a friend with regulated B+.  The test mule 
>had a pot that could dial the B+ from 180v to 300v.  I could not 
>measure any difference in receiver performance regardless of where 
>the B+ was set.  So, I concluded that the actual value of B+ in a 
>390a is monumentally non-critical.

This does suggest that there is precious little, if anything, to be 
gained by regulating the B+ in a 390A.

What would you be trying to accomplish?

Best regards,

Charles



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