I recently got my color classic put back together and there's a high pitched noise I'm trying to diagnose. I'm not an analog guy so I can't tell what it is. The sound repeats every 5 seconds or so and is louder when monitor is bright.
I recorded it using a nice mic and pulled out the spectral frequency graph and it's hovering around 10kHz, +/- 1kHz. It has an 'X' pattern where it drops and rises linearly, which gives it a dip-and-rise sound.
ColorClassicBuzz.mp3
Some ancillary issues are the screen starts up yellow-ish before getting to regular colors (especially after not being used for a long time, less so when started up within hours of the last time), and there's a slight pincushion shape to CRT. The board is a mystic board and has not been recapped but caps are clean and it performs well.
Any ideas on what needs fixing? Thanks!
I recorded it using a nice mic and pulled out the spectral frequency graph and it's hovering around 10kHz, +/- 1kHz. It has an 'X' pattern where it drops and rises linearly, which gives it a dip-and-rise sound.
ColorClassicBuzz.mp3
Some ancillary issues are the screen starts up yellow-ish before getting to regular colors (especially after not being used for a long time, less so when started up within hours of the last time), and there's a slight pincushion shape to CRT. The board is a mystic board and has not been recapped but caps are clean and it performs well.
Any ideas on what needs fixing? Thanks!