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Dead/quiet channel on Dual Turntable - cartridge?

post #1 of 6
Thread Starter 

I've just finished recabling a Dual CS503-1 because one of the channels was dead. I have continuity from the start of the tone arm wires right up to the RCA connectors but the problem persists. I have reversed the Left & Right connectors to make sure it is the turntable not the amp (tested with two amps). Seeing as I've ruled out the wiring does this mean there is a problem with the cartridge/stylus? And how would I go about finding out short of buying a new cartridge? It has the stock Ortofon/Dual DN249E still, not sure about stylus condition or if it's ever been replaced. (The one channel I have sounds fantastic!)

 

If I set the balance all the way over to the dead channel, I do get a quiet signal, but nothing at all when balance is normal.

 

Many thanks

 

Edit: I just measured the resistance between the two sets of pins on the cartridge (all wires removed). My working channel reads 14.4 M ohms while my faulty channel is 14.4 k ohms. Is this significant? Sorry for electronics noobishness


Edited by Tetromino - 7/8/13 at 8:10am
post #2 of 6

Don't measure phono cartridges with an Ohm Meter. Bad things can happen! 

post #3 of 6

Tetromeno- Are you saying one channel measures -14.4 MEG??-and that's the GOOD one?-The only  time values like that were used were in the distant past in CERAMIC carts.You must have measured it wrong. Moving Magnet cart should look into an impedance of -47K ohms so you would need to look into an impedance of MORE than -14.4 MEG - Never come across that before.a Moving Coil  cart -which has a VERY low resistance into a bit higher than the value of it-although yes it would still work into -47Kohms. This sounds like a collapsed needle holder  damaged by banging on the deck OR damage to the fine coil wire.. If MM magnet damage or movement.

post #4 of 6
Thread Starter 

Update: Connected each pair of tone arm wires together with a crocodile clip and measured the resistance across the pin and shield of the RCA connectors. Both returned identical results of approx 200 ohms. I am now fairly sure this is a cartridge issue and not the result of my wiring job! Does anyone else have any thoughts on this?

post #5 of 6
Thread Starter 
Quote:
Originally Posted by duncan1 View Post

Tetromeno- Are you saying one channel measures -14.4 MEG??-and that's the GOOD one?-The only  time values like that were used were in the distant past in CERAMIC carts.You must have measured it wrong. Moving Magnet cart should look into an impedance of -47K ohms so you would need to look into an impedance of MORE than -14.4 MEG - Never come across that before.a Moving Coil  cart -which has a VERY low resistance into a bit higher than the value of it-although yes it would still work into -47Kohms. This sounds like a collapsed needle holder  damaged by banging on the deck OR damage to the fine coil wire.. If MM magnet damage or movement.

 

I'm guessing I should just replace the cartridge?

post #6 of 6

CORRECT-Tetromino!  Values sound better.

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