with apologies to General Radio, these are made by Superior Electric.
In case anyone wants to transfer the heater/filament voltage adjustment
discussion into practice, I have some variable transformers that may be
of use:
Powerstat --
Type 10 120V 1.25 A variable transformer, used, no knob or dial -- $15
Type 10B 120V 1.75 A variable transformer, used, with dial, no knob --
$20
These are both 3" diameter by about 2-1/2" deep not including the 1/4"
diameter shaft.
Plus shipping, if necessary, naturally
Contact: Marv WC6W 310 649 3111 (reasonable hours Pacific Time
please)
or via return e-mail
*
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