VINTAGE General Radio "GenRad" Variac! (How It Works, How it's Wired, & Tests)
44:06
How An Isolated Dim Bulb Tester Works (Current Limited Isolation Transformer And VARIAC)
59:02
Amplifiers and Variacs!
11:00
(Not) Restoring an Auto Transformer
21:35
Variac Isolation Transformer. Are Variacs Isolated?
17:10
Circuit Specialists Variac Teardown and Review - Model TDCG-2D
9:37
Variac Overdrive
11:29
How to build a Homebrew AC variac for Radio amplifier repair Test bench
8:51