The Mellotron Group

What would we Mellotronists do without all the expertise on this list? Thanks folks!

Bernie

--- In newmellotrongroup@yahoogroups.com, lsf5275@... wrote:
>
> Actually, you led him to this one.
>  
> In a message dated 2/26/2012 1:55:59 A.M. Eastern Standard Time,  
> pocotron@... writes:
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> Frank-
>    You taught us well, Obi-Wan, thank you!   Looks like Bernie found it.
>  
>   -Bruce D.
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> From:  "lsf5275@..." <lsf5275@...>
> To: newmellotrongroup@yahoogroups.com  
> Sent: Saturday, February 25,  2012 12:04 AM
> Subject: Re:  [newmellotrongroup] Grounding Issue?
> 
> 
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> Good call Bruce... I didn't see your post or I wouldn't have repeated the  
> information.
>  
> Frank
>  
>  
> In a message dated 2/25/2012 1:30:16 A.M. Eastern Standard Time,  
> pocotron@... writes:
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>  
>  
>  
> Hey Bernie-
>   The headblock must remain electrically isolated from the  chassis to 
> avoid this.
>   Last time this happened to me I had a missing headblock  roller (previous 
> owner's fault, which I fixed).  Therefore, the  headblock was rubbing the 
> chassis, which changed the hum when different  tracks were selected.  A bad 
> cable can also cause this problem, but it  is usually screechy(not good for 
> tapes).  Check the w-clips that  hold down the headblock, their centering 
> washers may be off-set or worn  through, and may be causing the short.  You may 
> have to remove the  headblock to fix this one.
>   The track selector mechanism can also cause this  short.  However, if 
> this is the machine that Jerry Korb refurbished, he  probably already fixed 
> this.
>  
>   Hope this helps, best of luck.  More  sugar!
>  
>   -Bruce Daily
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> From: john barrick  <barrickjohn262@...>
> To: newmellotrongroup@yahoogroups.com  
> Sent: Friday, February 24,  2012 1:55 PM
> Subject: Re:  [newmellotrongroup] Grounding Issue?
> 
> 
> 
>  
>  
> Try putting it in the C position and then wiggle the cable a bit while  
> playing a note.  That may reproduce it.
> 
> On Fri, Feb 24, 2012 at 2:53 PM, john  barrick <_barrickjohn262@..._ 
> (mailto:barrickjohn262@...) >  wrote:
> 
> Maybe the cable going from the head block  to the preamp?  
>  
> 
> 
> On Fri, Feb 24, 2012 at 2:45 PM,  tron400 <_tron400@..._ 
> (mailto:tron400@...) >  wrote:
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> #500 has had an intermittant hum for a while now. I thought that  maybe it 
> was related to the volume pedal jack, but I noticed yesterday  that the 
> volume of the hum changes when I move the track selector. Track  C doesn't seem 
> to have any hum, but Tracks A and B do. Any idea what the  cause might  be?
> 
> Bernie
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> john barrick
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> 
> *Leo got it right the first time*
> *then he added a second pickup and got it  righter*
>