Hello,
I'm having trouble with distortion of about 1.5% on my hairball rev d. I recently finished the build and calibrated the unit, skipping the distortion calibration. Everything went well and it sounded great. The next day I noticed some distortion so I decided to do the distortion calibration. It was measuring about 1/5% THD and turning trimmer had little effect. I accidently bumped the trim pot and the distortion when down to .05%. I inspected and decided that the pot may be shorted, so I resoldered the pot and everything now appears to check out.
However, the distortion is still here. I tried re-calibrating and I noticed that the distortion levels are very reasonable until the q-bias control is brought up the the "1db or reduction" level as described in the calibration procedures.
I've tried searching this forum but I can't seem to find anything related. If anyone can point me in the right direction I'd really appreciate it.
cheers
Scott
I'm having trouble with distortion of about 1.5% on my hairball rev d. I recently finished the build and calibrated the unit, skipping the distortion calibration. Everything went well and it sounded great. The next day I noticed some distortion so I decided to do the distortion calibration. It was measuring about 1/5% THD and turning trimmer had little effect. I accidently bumped the trim pot and the distortion when down to .05%. I inspected and decided that the pot may be shorted, so I resoldered the pot and everything now appears to check out.
However, the distortion is still here. I tried re-calibrating and I noticed that the distortion levels are very reasonable until the q-bias control is brought up the the "1db or reduction" level as described in the calibration procedures.
I've tried searching this forum but I can't seem to find anything related. If anyone can point me in the right direction I'd really appreciate it.
cheers
Scott