2. analog
  3. 163825-133410

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 2 responses by totem395

totem395
390 posts
 
Although there are several minor differences in Classe 6, DR6, 6 MKII, there are mute and bypass/phono toggles on the
front plate.
I've had this bypass switch in the wrong position more than once.




totem395
390 posts
 
Your teck has tested the simple toggle switch used for selecting
MM/MC for continuity?
More to discover