The Mellotron Group

Actually, you led him to this one.
 
In a message dated 2/26/2012 1:55:59 A.M. Eastern Standard Time,  
pocotron@yahoo.com writes:
 
 
 
 
 
Frank-
   You taught us well, Obi-Wan, thank you!   Looks like Bernie found it.
 
  -Bruce D.
 



 
 

From:  "lsf5275@aol.com" <lsf5275@aol.com>
To: newmellotrongroup@yahoogroups.com  
Sent: Saturday, February 25,  2012 12:04 AM
Subject: Re:  [newmellotrongroup] Grounding Issue?



 
 

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@yahoo.com writes:

 
 
 
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
 



 
 

From: john barrick  <barrickjohn262@gmail.com>
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@gmail.com_ 
(mailto:barrickjohn262@gmail.com) >  wrote:

Maybe the cable going from the head block  to the preamp?  
 


On Fri, Feb 24, 2012 at 2:45 PM,  tron400 <_tron400@yahoo.com_ 
(mailto:tron400@yahoo.com) >  wrote:


 
 
 
#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
- 










john barrick


*Leo got it right the first time*
*then he added a second pickup and got it  righter*