From Cary Roberts Sent Fri, Jun 29th 2018, 20:37
I have the gray Tonus rev 1 but the previous owner already changed out the 4= 010 to the 4019, and I bought that 20 years ago. I am guessing the 4010 bro= ke. Here's the 4019. http://www.retrosynth.com/gear/arp2600/my_early_tonus/board_4/2600_early_ton= us_board_4_008.jpg -Cary=