[R-390] R-390/URR heater circuits.

[Jim Shorney]

Maybe this is relevant.

https://www.wb4hfn.com/DRAKE/DrakeArticles/Why_8BN8-2B.htm

On Tue, 11 Aug 2026 18:13:00 +0000 (UTC)
Jim Whartenby via R-390 <r-390 at mailman.qth.net> wrote:

> Fred and Renée Well yes and no WRT answering my question.   It is now my understanding that the heater power reduction was done to improve some aspect of using a triode as a diode.  I am not sure what circuit function is actually benefiting from this.  The noise aspect is a reasonable explanation for reduced heater power.
-- 

73

-Jim
NU0C
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