Ah, yes, the same idea is used in dual coil guitar pickups, also known as humbuckers.
Jim F
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-------- Original message --------From: Craig Sawyers <c.sawyers@...> Date: 12/9/18 1:53 AM (GMT-08:00) To:
[email protected] Subject: Re: Tube test adaptor for Tektroinx 575 was: Re: [TekScopes] FS: miscellaneous Tektronix manuals
A center tapped filament transformer, or a 'hum balance' circuit to create an artificial center tap
will do
even better. That circuit was often no more than a 200 ohm pot across the winding, with the wiper
connected to ground, and both filament leads floating above ground. A 2W pot was common for this
use.
Michael A. Terrell
The other common term (at least on my side of the pond) was hum bucker.
Craig
