Superior Electric Powerstat 116-1056 Variable Autotransformer 7.5 variac 0-145V

General Radio Type 200 B Variac Adjustable Transformer

General Radio Company Type W5 Variac Auto-transformer 115v 6a-50-60 Cycles

Vintage 200-500 GENERAL RADIO CO. VARIAC w/ Knob 0-135V Out

Superior Electric Powerstat 116 Variable Autotransformer 7.5 amp variac

Lucifer Lighting Company General Purpose Transformer TK-500 120/240V 0.5kVA

General Radio Type 200 B Variac Adjustable Transformer 170va PRI: 115 SEC: 0~185

Powerstat 10B Variac Variable Transformer 0-130V 2.25A 120V Input w/ Knob