J.LaPointe
Member
Hi folks. Hoping someone can lend a hand troubleshooting the following:
I have two Traynor line amp / EQ modules racked and powered for use in the mastering room here (they're useful for their saturation characteristics in the low end). Recently one channel has begun to oscillate at a very low frequency, below 5Hz I would say. Can't hear it, but I can see the speakers moving.
This seems to only happen with the LF eq pot set to flat, or toward the CUT side. I can stop the oscillation by moving it toward the BOOST side. It only starts to happen as music or other LF content is played through it, and the oscillation will then remain after the music is stopped. It will not start on its own, it seems.
Here's the module schematic, as well as a schematic of the (rather crude) power supply:
http://www.archivemastering.com/lab/YVM6_eq_schematic_May2006_small.jpg
http://www.archivemastering.com/lab/Traynor_PS.jpg
I replaced C2, C3, C9, and C10, as well as the final 330uF cap in the PS, hoping that would solve the problem, but it remains. My meager troubleshooting skills are tapped. Any suggestions at this point would be welcome. Thanks a million!
Best,
- J.
I have two Traynor line amp / EQ modules racked and powered for use in the mastering room here (they're useful for their saturation characteristics in the low end). Recently one channel has begun to oscillate at a very low frequency, below 5Hz I would say. Can't hear it, but I can see the speakers moving.
This seems to only happen with the LF eq pot set to flat, or toward the CUT side. I can stop the oscillation by moving it toward the BOOST side. It only starts to happen as music or other LF content is played through it, and the oscillation will then remain after the music is stopped. It will not start on its own, it seems.
Here's the module schematic, as well as a schematic of the (rather crude) power supply:
http://www.archivemastering.com/lab/YVM6_eq_schematic_May2006_small.jpg
http://www.archivemastering.com/lab/Traynor_PS.jpg
I replaced C2, C3, C9, and C10, as well as the final 330uF cap in the PS, hoping that would solve the problem, but it remains. My meager troubleshooting skills are tapped. Any suggestions at this point would be welcome. Thanks a million!
Best,
- J.