MC275 bass suddenly sounds weak an muddy. Bias problem?

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hi there,
yesteday - after about 40 hours breaking in - i noticed that something was wrong with my mc´s bass performance. i missed punch and attack, it was not sounding crispy anymore as i was used to the last few weeks. ok, may be i wasn´t in the mood for listening or something was wrong with my ears (too much coffee at brunch) but the same phenomenon i noticed when i checked again some hours later.
i changed some small tubes and power tubes too but i did not really help. last chance will be changing the fuse tonight...
if nothing helps: could it be a problem with it´s self biassing?
thank you!
N.

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Topic - MC275 bass suddenly sounds weak an muddy. Bias problem? - Nunki 22:28:42 01/16/11 (6)

What version of '275 are we discussing, here? - doodlebug 18:50:04 01/19/11 (1)

RE: What version of '275 are we discussing, here? - Nunki 22:18:26 01/19/11 (0)

RE: MC275 bass suddenly sounds weak an muddy. Bias problem? - FenderLover 01:07:47 01/17/11 (3)

Tube bias changes... - mkuller 15:13:37 01/17/11 (1)

RE: Tube bias changes... - Nunki 02:43:20 01/18/11 (0)

RE: Tube bias changes... - casouza 21:16:31 02/10/11 (0)

RE: MC275 bass suddenly sounds weak an muddy. Bias problem? - Nunki 01:42:37 01/17/11 (0)

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