Inconsistant pitch

Muzzy

Muzzy

New Member
Hi,
I finally got a new needle for my JVC JL-A15, plugged it in and started A-Bing it with my cheapo Sony PS-lx62. The first thing I noticed is the sound quality of the JVC was far better than the Sony and much louder too. I was very happy! :smoke:
Second thing I noticed was that the pitch on the Sony was spot on but the JVC was inconsistent. Now not so happy :tears:
I would guess to say the pitch changes slightly once every revolution.

I used the same record on both players so the LP is good and needle is new.

Does this mean i need a new belt?


 
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The most likely cause of pitch issues on older tables is a belt that has been stretched over time. I'd definitely order up a replacement, and would suspect that this would address your pitch issue straight away.
 
I'd have to agree with the belt. One of my TTs has a flat belt. The motor was not exactly square with the platter, so as it turned the belt would ride up and down on the pulley causing a similar problem. My motor had adjustments to square it up and that took care of it. So you may have adjustments that you can try first. Otherwise a belt should do it.
 
Thanks guys. Rang my local HiFi shop and I need to measure the diameter of the platter.
Getting the platter off is harder than i thought. I can't seem to pull it off and don't wanna break it of course.

Any ideas?
 

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Muzzy said:
Thanks guys. Rang my local HiFi shop and I need to measure the diameter of the platter.
Getting the platter off is harder than i thought. I can't seem to pull it off and don't wanna break it of course.

Any ideas?
Click to expand...

Put a little lube around the spindle. Let it soak down between the platter and spindle for say an hour, then try pulling off the platter. You may also need to clean the speed pots with a good contact cleaner. it certainly wouldn't hurt to do it anyway.
 
I don't know any thing about your machine. Some have a split-ring holding the platter on, if nobody ever took the platter off before. With some others the platter seats rather snuggly after some period of use, but if you keep gentle up-pressure on the platter with two hands, and at the same time, with your third hand, you give a sharp little tap on the top of the spindle with a small mallet, the platter will immediately and safely come free. What, you don't have three hands? Too bad, that method works really well with some machines.
 
If you have a rubber mallet, place your thumb and forefinger in through the two small holes in the platter. Pull the platter up gently, then as you strike the spindle with low-moderate force, pull up with greater force. The combination of the mallet strike while pulling up should prompt the platter to pull free.
 
illinoisteve said:
I don't know any thing about your machine. Some have a split-ring holding the platter on, if nobody ever took the platter off before. With some others the platter seats rather snuggly after some period of use, but if you keep gentle up-pressure on the platter with two hands, and at the same time, with your third hand, you give a sharp little tap on the top of the spindle with a small mallet, the platter will immediately and safely come free. What, you don't have three hands? Too bad, that method works really well with some machines.
Click to expand...

ha ha - sorry only two hands I am afraid! But I am sure the guys who made it had three.

I have tried tapping it and pulling it using those two finger holes but am really worried something is going to break. The TT itself is mostly plastic and vintage at that. So after having a few goes, I decided to that maybe I am not the man to do this job. I am pretty good at breaking things and don't want to apply this skill on this ol' TT.

Think I will drop it in at my HIFI store and hopefully it will be easy for him. Though he probably try to talk me into buying a thorens or something!
 
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