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Looks like it was one of the spring hooks that holds the head block in place. One of them was not in its hole.
Bernie
--- In newmellotrongroup@yahoogroups.com, "tron400" <tron400@...> wrote:
>
> Wouldn't you know, it's not acting up at the moment. I'll have to leave it running for a while.
>
> Jerry put a new cable in when he refurbished it. The old one had the screeching cable rot.
>
> BTW, anyone have an empty frame laying around?
>
> Bernie
>
> --- In newmellotrongroup@yahoogroups.com, lsf5275@ wrote:
> >
> > 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:
> >
> >
> >
> >
> >
> > 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@>
> > 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:
> >
> >
> >
> >
> >
> > #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∗
> >
>