[AMRadio] Superior Electric Co. Stabiline Voltage Regulator

[Donald Chester]

I'm looking for any documentation on the Superior Electric Co. Stabiline 
voltage regulator type S322. The unit has a motor driven variac that feeds a 
stepdown transformer whose secondary is in series with the line, arranged to 
buck or add to the line voltage depending on the setting of the variac. It 
is supposed to give a nominal voltage output of 115v from 100 to 135 volts 
input, rated up to 4 kva. The control unit operates with a pair of 2D21 
thyratrons that drive relays to control the reversible motor that operates 
the variac, so that the output voltage remains at the nominal value despite 
variations in power line voltage.

The unit has a schematic, but no circuit description exactly how the control 
unit works. It is presently non-functional. I have very little knowledge 
about the applications and uses of thyratrons. There is one little plug-in 
device that resembles a metal octal tube that evidently provides the 
standard comparison voltage. The schematic shows nothing but 3 resistors 
inside the unit. Someone has taken it apart and one of the resistors has 
been replaced with a small resistor in series with a pilot lamp that looks 
similar to a #47.

I notice in the Electronics Master catalogues going all way back to WWII, 
Superior Electric Co. displays various models of units similar to this one. 
Does anyone have any kind of documentation on any one of these regulators, 
especially on the electronic control unit?

If I can get this thing (a hamfest find) working properly, it should solve 
the problem of the flaky power line voltage we have here.

Don K4KYV

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