[Jukebox-list] Seeburg Thump

[Jay Hennigan]

david wendell wrote:
> Hi Everyone
> 
> While we are on the "Seeburg Thump" problem I am
> mystified about my Seeburg "B".  If I use a red head
> cartridge I get a loud thump at the end of the record.
>  If I use a black head cartridge there is not even a
> hint of a thump.  It has been several years since I
> gave up on the red head cartridge but before I did I
> changed the capacitor across the cancel switch and
> checked the mute circuit carefully.  
> 
> I may have missed something as I continue to wander
> around the world of jukeboxes!  Maybe I need that trip
> coil shield?

Is the thump substantially louder on the "B" side of the record (pickup 
to the right side of the record when viewed from the front)?  If so, 
then the metal shield may be of value.  This thump is caused by the 
magnetic field from the trip coil being picked up by the coils in the 
cartridge and amplified.

On the left side of the record, the cartridge is farther from the coil 
and the magnetic field weaker.

--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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