Howdy all,
I'm trying to service a knackered old Technics 1210MK2 turntable from my work, and upon dusting it off and testing it out I have found that the RCA connectors appear to be out of phase. I plug either white or red cable into a phono pre-amp (in the form of a dj mixer) and get a decent signal coming out of the headphones but when I plug both in at the same time, the gain drops significantly and it has that unmistakable 'thin' sound that signifies being out of phase.
Is it just a simple case of resoldering the wires and swapping the tip and sleeve on one of the cables or is it more complicated than this to fix? Another thing to note is that these cables don't look like the original cables that come with a set of Technics turntables so perhaps they were replaced at some stage over the years.
Cheers,
Hayden
Turntable out of phase
Re: Turntable out of phase
on the rear of your cartridge there are 4 wires that run up the tone-arm.
all you need to do is swap 2 of the wires around (either both left or right) to get the correct phase.
The correct way to wire it up is :-
Green - top right
Red - Bottom right
Blue - top left
White - bottom left
all you need to do is swap 2 of the wires around (either both left or right) to get the correct phase.
The correct way to wire it up is :-
Green - top right
Red - Bottom right
Blue - top left
White - bottom left
Re: Turntable out of phase
It's almost certainly because the cartridge has been wired up incorrectly. There are four colour coded terminals on the back of the cartridge, two for the left channel and two for the right, and four coloured flying leads running up the arm. Check that the right coloured wires are going to the right coloured terminals.
If all looks correct at the cartridge, then the problem is probably under the arm base where the arm wires are connected to the phono cable -- someone may have replaced the cable and wired it up wrongly.
Fix the problem in the turntable/tonearm -- don't swap the connections in the phono plugs, because doing that will render the cable screen useless.
Hugh
If all looks correct at the cartridge, then the problem is probably under the arm base where the arm wires are connected to the phono cable -- someone may have replaced the cable and wired it up wrongly.
Fix the problem in the turntable/tonearm -- don't swap the connections in the phono plugs, because doing that will render the cable screen useless.
Hugh
-
- Hugh Robjohns
Moderator -
Posts: 43685 Joined: Fri Jul 25, 2003 12:00 am
Location: Worcestershire, UK
Contact:
Technical Editor, Sound On Sound...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
Re: Turntable out of phase
I swapped around the two 'R' connectors on the headshell/cartridge (red and green) and that's fixed it. Thanks guys!
Interesting to know Hugh as the cartridge was wired up correctly according to the legend on it, so perhaps it is how it's wired under the tone-arm.
Cheers again,
Hayden
p.s. I want to buy it from my work and they want me to offer them a price. How much should one expect to pay for a completely knackered old Technics turntable?
I don't think I could even find one this beat up on e-bay.
Interesting to know Hugh as the cartridge was wired up correctly according to the legend on it, so perhaps it is how it's wired under the tone-arm.
Cheers again,
Hayden
p.s. I want to buy it from my work and they want me to offer them a price. How much should one expect to pay for a completely knackered old Technics turntable?
I don't think I could even find one this beat up on e-bay.Re: Turntable out of phase
I used to do quite a bit of DJ club work and used to buy the old tatty ones from night clubs when they were renewing their systems.
I used to pay about £80-£120 a pair if they were beer drenched. They used to polish up pretty well though
I used to pay about £80-£120 a pair if they were beer drenched. They used to polish up pretty well though