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.
"Also, did you make any recent changes? Or disturb any cables/connections prior to the Right channel going out?" Yes. I was comparing the pre + amp combo vs integrated amp. Switching cables a number of times. Currently I am experiencing intermittent right channel in/out when cables are correctly connected. I have reversed connections several times.
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@atmasphere I did this today. When I started a record playing the right channel was completely out, then became intermittent. I then 'wiggled' the right cable connector and the channel came back for the entire record. I will turn everything off and come back later to see if all is still ok. I recommend Chopin Etudes as an aid to diagnosing this kind of problem. As well as a strong suggestion from Ralph. |
