1. Home
  2. amps-preamps
  3. 1327706393

MA2275 Issue need some advice

Looking for some advice. McIntosh MA2275 integrated and the left channel sounds dirty, at higher volumes the bass sounds staticy and broken, almost like a blown speaker. Using B&W 805D's, swapping the speakers the problem is still there but on the other speaker so its coming from the amp and not the speaker. Do the tubes need replacing?
g5flier
hifihvn
943 posts
 
I hope your using other inputs than phono also. And, if it did the same with other inputs, the above would have worked. Otherwise it could be a bad gain, or phono tube if you just used phono in.
hifihvn
943 posts
 
The center tubes (V5 to V7) aren't mirrored on top of the chassis, meaning the two on the left
Correction: Should have wrote (V4 to V7)...
g5flier OP
9 posts
 
Hifihvn - wow thank you so much for looking over the schematic and comments!!! I'm only using the CD input, not phono at this time. I did swap CD and CD2 but same result.
hifihvn
943 posts
 
I should clarify. Section B of V4 and V5 tubes are for the left channel. Section A of V4 and V5 are for the right channel in these phono tubes.

Section A of V6 and V7, tubes is for the left channel. Section B of V6 and V7, is for the right channel of these gain tubes.
g5flier OP
9 posts
 
Hifihvn, again thank you! So given what you have found out what do you think is the next step? Should the tubes be replaced? Something else? Thank you!
More to discover