Sound Skulptor forums

Build help and troubleshooting => MP566-II Tube microphone preamplifier with HPF => Topic started by: JPK on May 16, 2026, 09:20:41 AM

Title: Green LED blinks when there is no signal
Post by: JPK on May 16, 2026, 09:20:41 AM

This problem arose when we started using a new batch of TL074. The solution is simple:
- Replace R44 (1M) by a 100k 1%-1/4W.
- Replace C19 (100nF) by a 1uF-50V ceramic.