2. amps-preamps
  3. 182153-20064

Need help diagnosing a preamp problem

I have a Shindo  Monbrison preamp with a MM/MC phono section.  It is about 12 years old, maybe more. The phono section contains a 12AU7 and 12AT7 in both right and left channels.  No other tubes in the phono section.

Two days ago  the right channel stopped producing output when playing a record.  Other source inputs are working fine.

I replaced all 4 tubes with known working tubes of the same type and vintage.

Problem remains.

I have a standalone phono preamp available if that would help.

clio

Showing 1 response by rhg3

rhg3
217 posts
 

Switch the Right/Left of your phono cable to the preamp. If the problem moves to the left channel then the problem lies with the turntable. The tonearm cable might be damaged. Possibly a cartridge issue.

Also, did you make any recent changes? Or disturb any cables/connections prior to the Right channel going out?

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