[R-390] R-390A Current Regulator Tube replacement?

[roy.morgan at nist.gov]

Quoting Dan Rae <danrae at verizon.net>:
.. run the two oscillator tube filaments from the 
> otherwise unused 12.6 Volt center tap on the power transformer. 

Is one end of the 26 volt winding grounded??? I am not sure without getting out
the schematic.
 
> Anybody tried this before, or got any comments for or against? 

No, I have not tried it.  

One comment is that it means the modules are now not interchangeable, at least
to some extent.

Roy

 

Roy Morgan
7130 Panorama Dr.
Derwood MD 20855