I would hope it's NOT the three cartridges.

That would mean I had three good cartridges and one problem to solve. Don't you have multiple turntables?

Lol me too but I have plenty of mmcs.   Three mmc2s four mmc3s and once mmc4.  

I confirmed it is the turntable and not the cartridge today.   I put the mmc2 in another beogram downstairs and it works fine,   I took a good mmc3 and after a few hours the left channel dropped in output by 60 percent at least.

Funny thing is the fix is fast, just power it off for a few seconds and its fine for maybe 5 hours of play then it will drop the channel output. 

That does not sound like a loose connection, why would a loose connection be fixed by powering it off?  

RAJOD wrote:

That does not sound like a loose connection, why would a loose connection be fixed by powering it off?  

 

Something moves when you do that.

Nothing moves when I power it off.   The turn table does not have a power on/off.  I can do it at the wall, the power filter or from the amp.  Any will do the trick.   Sorry no cigar!

Is the Beogram the only thing that is powered off ?

Martin

I've tried it via Beogram plug,  or from amp, or from power strip.  Results all the same, it fixes the TT for like 5 hours then once channel goes dim like 1/2 volume.   Turn it off/on and Bam back in action. 

If it worsens I probably will send it out for a fix.   Just seeing who here can come the closest to what could be causing it.  I'll report back here if you are the winner.

You verified the cartridges are good by testing them in other Beograms with different amplifiers. Did you take the problem turntable and test it with one of those other amplifiers?

-sonavor

I still suggest muting relay.

I realize it grounds the + side to ground only while muting and shouldn't logically be the fault, but in that it cycles and moves it's contacter whenever you end play or shut the deck off AND that's when the situation resolves, can't help wondering what might be going on inside.

I think you can probably stick a little piece of paper between the contacts with the plastic cover popped off the relay to pretty much eliminate it as a cause.Just sayin.

The muting relay is mounted on a small seperate pcb,sited at the rear left hand corner of the machine.Although as other's have rightly stated,the relay doe'snt interupt the signal path,there may be a poor solder connection on the pcb,possibly where the fine wires from the pu connect,or the output cable? I suspect that when you power off,then on again,the small mechanical vibration as the relay reset's may be overcoming the problem.

Next time it happens,try gently tapping around the rear left hand corner of the case.If the fault clears,I rest my case,otherwise "beam me up Scotty"!

Nick