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Classe Six Preamp MC Output not Working

Some of you may recall I decided to switch out two resistors in the MC output section of my Classe Six preamp to boost its gain for a new MC cartridge.

I've been running MM ever since I bought it but have purchased the AT ART9XA MC cartridge and followed the Classe manual directions to replace resistors R-15 and R-16 with 3830F's to boost the MC gain by 8 dB because of the XA's low .2mv output.

My tech friend did the switch yesterday, then found there's no output when the rear panel switch is put in the MC position, while the MM is fine.  I've never used the MC section, so we have no idea if it's been inoperable for years or it's a result of yesterday's resistor switch.  One thought he had is that the MM/MC switch is old and might be suffering from lack of use for 28 years.

Any ideas as to why the MC section has died?  My friend sent me pics of the new resistors in place and they look fine.  We're stumped.
keegiam

Showing 1 response by dover

dover
2,177 posts
 
Check the Selector/Bypass/Mode switches are set correctly.
They intereact with each other - reread the manual.
Bypass mode shorts inputs.

Otherwise get another "tech" - any competent tech should be able to figure it out - faulty caps, resistors, relays, latching circuits - this is basic stuff. Go to your local high end store and ask if they know a good tech if you don't. 

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