as it turns out, it pays to be stubborn
i checked everything, and found 1 trace gone 'missing', so fixed that. re-soldered and checked everything that looked suspicious, cleaned my board .. and i had repeats again!
At first i was scared a bit, because i still had distorted repeats.
But after tweaking the gain trimmers, there it was sounds brilliant now.
i found that gain1 in particular was responsible for the distortion i was still getting...
When setting the trimmers the first time, i gradually increased both gains simultaneously and by the time i got runaway feedback, the repeats were distorted. but by lowering gain1 a bit and increasing gain2, i got it to run away, with nice repeats.
thanks for the help
i checked everything, and found 1 trace gone 'missing', so fixed that. re-soldered and checked everything that looked suspicious, cleaned my board .. and i had repeats again!
At first i was scared a bit, because i still had distorted repeats.
But after tweaking the gain trimmers, there it was sounds brilliant now.
i found that gain1 in particular was responsible for the distortion i was still getting...
When setting the trimmers the first time, i gradually increased both gains simultaneously and by the time i got runaway feedback, the repeats were distorted. but by lowering gain1 a bit and increasing gain2, i got it to run away, with nice repeats.
thanks for the help