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HELP: Technics SL-QL1 Linear tracking TT behavior

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kap'n krunch

2K Club - QQ Super Nova
Joined
Nov 25, 2008
Messages
6,511
Location
nola, estados hundidos
Hello all out there!

Hopefully someone will be able to clear my doubts...
I know that linear tracking TTs are mostly for freaks like me and that since there are no good methods of taking care of the LINEAR tracking part, the industry has given up on them...except for Clear Audio´s really expensive arms...

I personally love the sound of my TT but it has always had this nagging defect:
you can see it in the waves when I rip any album, it seems it either goes towards the inside or it is dragged from the outside and it makes this low frequency noise/thump once every revolution which I have to EQ from quiet passages.

Now, I think that my TT´s arm is moved through a servo motor but that´s as far as I go.

I have 2 other exact TTs in Madrid, (I got 2 so I could use one for parts) so my question is:

is this a "manufacturing/impossible to solve problem" or would it go away if I change the belt that is used???

I had my other 2 TTs in Madrid serviced by Panasonic/Technics personnel when I got them originally but it somehow still made that noise (I guess in a way this MAY answer my question but I will never know if the folks ACTUALLY changed the belt)...

This is the Vinyl Engine page where anyone (OK, you have to sign up but it´s free) can look up the user guide and schematics for this TT in case someone is willing to give me a hand...granted, I know a lot of you are a bunch of wizards (I am NOT!) and in case anyone can actually help out I will gladly ship this and pay for the upgrade...

Thanks in advance!
 

vinylguy4

600 Club - QQ All-Star
Joined
Apr 5, 2004
Messages
655
Location
San Diego area
I had one of these TTs at one time, been quite a while. Never noticed the problem you are having.
Sounds like pages 9 and 10 of the service manual are the parts of interest here (figures 12 -16).
 

The Bushmaster

500 Club - QQ All-Star
Joined
Nov 24, 2012
Messages
551
Location
Ava. MO
Love my Dual 721...It goes round and round and gives no problems at all. No belts and no idler wheel.
 

atrocity

1K Club - QQ Shooting Star
Since 2002/2003
Joined
Jun 14, 2002
Messages
1,583
Location
Sacramento, California
I've never had the thumping with a Technics, but I have had it with a Sony. One shop tried to fix it but couldn't. Another replaced a belt and, a mere $30 later, the problem was gone.
 

gene_stl

Well-known Member
Joined
Nov 3, 2019
Messages
159
Location
St.Louis
It might be the platter bearing. If it occurs once a turn regardless of where the arm is located it almost certainly is.
Getting the platter off should be in the manual. You probably need to top up the lubricant.
Or maybe something under the platter that is rubbing once per turn.
 
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