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IK0VNQ > ALL 21.07.09 17:03l 37 Lines 1045 Bytes #999 (999) @ WW
BID : L7JIK2XDE04L
Read: GUEST
Subj: Re^2: KB2VXA > hum bucking
Path: IZ3LSV<IK6ZDE<IK2XDE
Sent: 090721/1450z @:IK2XDE.ILOM.ITA.EU [Italy] obcm1.07b3 LT:999
From: IK0VNQ @ IK2XDE.ILOM.ITA.EU (Filippo)
To: ALL @ WW
X-Info: Sent with login password
From: KB2VXA@VK2TV.#MNC.NSW.AUS.OC
To : OLDSET@WW
>Hi Neil and all,
>
>The hum bucking coil was a winding on the speaker electromagnet that was
>fed from the filament line, exactly how I don't remember. "In an
>unrelated incident" I had a hi-fi amp with a wire wound pot across a
>floating heater line, that is to say neither side was grounded, rather
>the wiper was.
>
............................ CUT ........................
Hi Warren and all,
the winding on the speaker electromagnet was in series with the rectified
high voltage so that, together two electrolytic capacitors, performed also
the function of filter choke.
73 de Filippo
IK0VNQ @ IK2XDE
>>> GREETINGS FROM THE ROMAN CASTLES, LAND OF WINES! <<<
..................................................................
>
>73 de Warren
>
>Station powered by JCP&L atomic energy, operator powered by natural gas.
>
>Message timed by NIST: 10:12 on 2009-Jul-21 GMT
>
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