Quote:
Originally Posted by old_tv_nut
This seems like typical motor commutation interference.
Zenith had a device they called "the growler" for testing analog TV sync circuits.
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That's the second diagnostic tool use I've heard for the word "Growler" . In electric motor servicing there is a tool called the growler that will indicate shorted windings in a motor's armature . Since the electric motor servicing growler predates mass market TV , I believe the name of your device was borrowed from the original growler ...