2. amps-preamps
  3. 185617-152491

Did my preamp short kill my Mark Levinson amps and Infinity Beta servo ?

My solid state preamp ( prefer not to name as maybe I am completely wrong in my thinking) that without warning developed a short in the right channel output due to some type of "leak" killl my wonderful vintage system?  Both ML No23 amps and the Infinity Beta bass crossover servo unit all stopped working - non of which had any external fuses blow.

I am able to get my  high end preamp fixed by the maker, but living in rual Minnesota makes it basically impossible to find a place that can look at all my other now non-functioning equipment.   (No lightening strikes and everything on high quality heavy duty line conditioners that did not trip).  The Infinity Beta servo is the unit I really hope to save because those speakers are mint and my wife actually accepts them.  Anyone know who might service that piece?

jerry_b2

Showing 1 response by panzrwagn

panzrwagn's avatar
panzrwagn
456 posts
 

OK, a 'short' means that somehow the preamp leaked DC voltage into the Infinity crossover/servo box and the power amp? But if the Infinity is a Low Pass/High Pass setup, which I think it is, the high pass section would block DC from the HP output feeding your Hafler, wouldn't it?

I'm just trying to understand.

Maybe the short was in the power supply of the preamp and DC or worse, a rectifier diode failed, and it was AC that got on the chassis ground? In that case it may have fried the ground traces off the circuit boards in both down stream devices. That's not really fixable, and you'd be looking at replacements. Either way, bummers, Best of luck with your repairs.

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