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G8MNY > OLDSET 21.07.09 19:19l 11 Lines 491 Bytes #999 (0) @ WW
BID : 32417_GB7CIP
Read: GUEST
Subj: Re: Interest in vintage radios
Path: IZ3LSV<IK2XDE<F8KFY<ON0AR<GB7CIP
Sent: 090721/0946Z @:GB7CIP.#32.GBR.EU #:32417 [Caterham] $:32417_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : OLDSET@WW
I think the hum bucking winding was on the outer limb of the LS electrom
agnet (HT choke), so nothing to do with the mains transformer. The hum Pot was
called a "hum dinger" (?) & used a low value (20ohm) pot slider earthed across
valve heaters on directly heated 4V valve gear. This let you set the minium hum
for that set of valves at that time on that mains voltage!
73 de John G8MNY 2009-JUL-21 @ 10:45, using PaKet6.2/Win98/Pent2
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