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ifredoto
New
Username: ifredoto

Post Number: 2
Registered: 12-2008
Posted on Friday, October 02, 2009 - 3:24 pm:   Edit Post

I have a 1980 LSB1 and am the orignial owner. I have gone through several 5 pin cables over the years and have recently encountered an issue. A high pitched squeal which stops when I disconnect the 5-pin cable. When I plugged it back in, it started again. This isn't the forst time this has happned. I changed to a back up cable and didn't have any issues for the remainder of the gig. I did have the module board worked on some 20 years ago and was wondering if anyone else had similar issues .Is the cable or the comdule board
811952
Senior Member
Username: 811952

Post Number: 1742
Registered: 10-2003
Posted on Friday, October 02, 2009 - 4:06 pm:   Edit Post

turn the filter knob and see if it quits. mine does that sometimes if the q is at maximum.

John
the_mule
Senior Member
Username: the_mule

Post Number: 754
Registered: 1-2004
Posted on Saturday, October 03, 2009 - 12:04 am:   Edit Post

If you try John's suggestion and it seems that the problem is there, you could tweak the trimpots on the backplate for that particular pickup: http://alembic.com/club/messages/16271/50896.html?1208917987

I had the same problem with the bridge pickup of my Series I with the filter and q to the max and I managed to solve it with a small adjustment of the hum balance trimpot and the pickup height.

Good luck!
Wilfred
davehouck
Moderator
Username: davehouck

Post Number: 8819
Registered: 5-2002
Posted on Saturday, October 03, 2009 - 3:17 pm:   Edit Post

- Does it always squeal with the one 5-pin cable, but never with the other?

- Does it squeal with a 1/4" cable?

- How long has this been happening?

- Does it squeal when the selector switch is on neck pickup ony? Bridge pickup only?
811952
Senior Member
Username: 811952

Post Number: 1748
Registered: 10-2003
Posted on Saturday, October 03, 2009 - 3:31 pm:   Edit Post

-Does it do it on the job?

-Does it do it with a knob?

-Does is do it in a pinch?

-When it does it do you flinch?

-Does it do it over there?

-Does it do it in a chair?

;)

I couldn't resist. Sorry.

John
davehouck
Moderator
Username: davehouck

Post Number: 8820
Registered: 5-2002
Posted on Saturday, October 03, 2009 - 3:38 pm:   Edit Post

Actually, it's a pretty good troubleshooting list!
2400wattman
Senior Member
Username: 2400wattman

Post Number: 743
Registered: 11-2005
Posted on Sunday, October 04, 2009 - 12:36 am:   Edit Post

Sounds like an application for a prostitute to me, but that's me and if anybody here KNOWS me I would think of something like this, me thinks!
slawie
Intermediate Member
Username: slawie

Post Number: 111
Registered: 8-2002
Posted on Sunday, October 04, 2009 - 1:09 am:   Edit Post

Wow Dr. Seuss is a club member!

slawie
811952
Senior Member
Username: 811952

Post Number: 1749
Registered: 10-2003
Posted on Sunday, October 04, 2009 - 12:24 pm:   Edit Post

Does he play a Series I?

Does he play it just for fun?

Does he gig with it for free?

Does he gig and charge a fee?

;)

John
ifredoto
New
Username: ifredoto

Post Number: 3
Registered: 12-2008
Posted on Sunday, October 04, 2009 - 2:46 pm:   Edit Post

I have tried flipping switches and turning knobs and the only thing which will stop the noise is disconnecting the cable. It has also happened once using the 1/4" but coincidentally, the batteries went dead so after I changed the batteries, no noise.

I will try the trim potts as I have cleaned everything else except those.
davehouck
Moderator
Username: davehouck

Post Number: 8824
Registered: 5-2002
Posted on Sunday, October 04, 2009 - 3:19 pm:   Edit Post

So it happens with both five pin cables?
811952
Senior Member
Username: 811952

Post Number: 1753
Registered: 10-2003
Posted on Sunday, October 04, 2009 - 5:00 pm:   Edit Post

I might suggest re-seating the connections inside the body. Being an older instrument, it's entirely likely that there may be oxidization that's throwing the whole mess out of specification..

John
ifredoto
New
Username: ifredoto

Post Number: 4
Registered: 12-2008
Posted on Sunday, October 04, 2009 - 5:37 pm:   Edit Post

Hasn't happened with "Alembic" cable yet. It might be too soon to tell. I will check the trim potts and inside body connections to see if that helps.

Thanks for the suggestions.
Ian
811952
Senior Member
Username: 811952

Post Number: 1754
Registered: 10-2003
Posted on Sunday, October 04, 2009 - 6:09 pm:   Edit Post

That's a beautiful bass you've got there...

John

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