1176 mnats rev J - Low end rolloff

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jonsibar

New member
Joined
Feb 17, 2017
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3
Hi!

I built an 1176 mnats rev J a few years ago, and I'm having an issue with a dramatic rolloff in the low end.
Tracing the audio-signal for testing, it sounds perfectly okay and compressed on the primary side of the LL5402 output tranny, but weak and thin on the secondary. I replaced the LL5402 just to check if it had a problem, but that didn't help.

I've been searching a bit on this forum and elsewhere without finding a possible solution. Could it be impedance-related? I would really appreciate a few hints on where to troubleshoot further!
 
Did some more troubleshooting, and seems like it may be an issue with hot/cold/ground. Not that I can figure out why this happens just yet...
 
Tried with unbalanced cables now, and hey presto! Seems to be some kind of phase cancellation at play... does anyone have any tips?
 

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