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Thread
2012-02-24 by tron400
#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
2012-02-24 by john barrick
#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
2012-02-24 by john barrick
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
-
2012-02-25 by Bruce Daily
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*
2012-02-25 by lsf5275@aol.com
I'm guessing that when you switch tracks there is something causing the head block to ground. Check the retainer springs and make sure that they are isolated from the head block channel at the bottom (half-grommet in good shape) and that they do not come in contact with the tape guides. Also check that the head block rollers are properly positioned and in good shape. In a message dated 2/24/2012 3:46:02 P.M. Eastern Standard Time, tron400@yahoo.com writes: #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
2012-02-25 by lsf5275@aol.com
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*
2012-02-25 by tron400
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* >
2012-02-26 by tron400
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* > > >
2012-02-26 by lsf5275@aol.com
With Mellotrons, as with Harley Davidsons, start with the simplest possibility and work your way up. Most of the problems are resolved at 'simple." Glad you found and fixed it. Frank In a message dated 2/25/2012 7:34:31 P.M. Eastern Standard Time, tron400@yahoo.com writes: 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_ (mailto: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_ (mailto: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_ (mailto: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* > > >
2012-02-26 by Mark
Zen and the Art of Mellotron Maintenance eh? So much for Lent. Mark PS Thanks for the kind comments on "And Beyond", there were 5 or 6 layers and it was phased, reverbed filtered and reversed!
On 2/26/12, lsf5275@aol.com <lsf5275@aol.com> wrote: > With Mellotrons, as with Harley Davidsons, start with the simplest > possibility and work your way up. Most of the problems are resolved at > 'simple." > Glad you found and fixed it. > > Frank > > > In a message dated 2/25/2012 7:34:31 P.M. Eastern Standard Time, > tron400@yahoo.com writes: > > > > > 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_ > (mailto: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_ > (mailto: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_ > (mailto: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* >> > >> > > > > >
2012-02-26 by william Beith
With all this talk of a grounding issue, I have a low level ground hum in my console. Can anyone reccommend a good tech in the Chicago area? I have worked past my knowledge and abilities trying to find it. Thanks Bill ________________________________ From: "lsf5275@aol.com" <lsf5275@aol.com> To: newmellotrongroup@yahoogroups.com Sent: Sat, February 25, 2012 9:10:08 PM Subject: Re: [newmellotrongroup] Re: Grounding Issue? With Mellotrons, as with Harley Davidsons, start with the simplest possibility and work your way up. Most of the problems are resolved at 'simple." Glad you found and fixed it. Frank In a message dated 2/25/2012 7:34:31 P.M. Eastern Standard Time, tron400@yahoo.com writes:
>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* >> > >> > >
2012-02-26 by Bruce Daily
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* > > >
2012-02-26 by lsf5275@aol.com
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*
2012-02-26 by tron400
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: > > > > > > Frank- > You taught us well, Obi-Wan, thank you! Looks like Bernie found it. > > -Bruce D. > > > > > > > > From: "lsf5275@..." <lsf5275@...> > 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@... 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* >