[Boatanchors] National SW-3 screen resistor

[RJ Mattson]

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?
bob..w2ami
www.qrz.com/callsign/w2ami


----- Original Message ----- 
From: "Vic Rosenthal" <vic@rakefet.com>
To: "Boatanchors List" <boatanchors@mailman.qth.net>
Sent: Tuesday, March 30, 2004 4:24 PM
Subject: [Boatanchors] National SW-3 screen resistor


> I have a National SW-3 model II (tube complement '36, '36, '27) which
> has been modified.  The tapped power resistor was removed, and the RF
> stage screen and the regeneration control were supplied from a 60V
> output from the (homemade) power supply.  I want to try to make it as
> close to original as possible, so I need to know:
> 
> 1) What is the value of the original resistor, and the tap points?
> 
> 2) Which tap goes to the RF stage screen and which to the regeneration
> control?
> 
> 3) I'm probably dreaming, but does anyone have one of these resistors
> for sale, or know where to get one?
> 
> If I can't get one, I will just use a standard adjustable resistor with
> a couple of taps.
> 
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
> 
> 
> 
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