The Mellotron Group

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> 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> 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*
>
>
>