[Boatanchors] National SW-3 screen resistor

[Vic Rosenthal]

RJ Mattson wrote:

> Vic,
> Are you sure the tube line-up is correct? The DC SW-3 uses 36-36-37
> and did not have a voltage divider since it is powered by three
> battery voltages. Below is a url to the Model II DC-SW-3 schematic.
> http://www.hvinet.com/rjmattson/dcsw3
> The DC SW-3 has a toggle switch in the front  lower right hand
> corner to disconnect the B- of the batteries.
> Could yours be a Model II, DC SW-3?

You are absolutely right!  I typed '27 instead of '37, and when I look 
at the schematic, this is the one I have.  The homebrew power supply has 
a voltage divider to provide the 67v, and the original 20k resistor to 
the regen control is present.  Interestingly, I do NOT have the switch 
in the B- line.  There is a hole in the chassis on the LEFT side, but it 
looks like it was not drilled by the factory!

Thank you for clearing this up for me.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco