My old Optonica RT-6207 is running a little slow (recent yard sale
purchase). Without any special equipment, I would like to give a try
adjusting it. I gather there is a screw or pot somewhere that might
adjust motor voltage and subsequently speed. If this is in fact
correct, where should I look for it? It is a 2 motor drive, does that
affect what I may need to do? Don't have a 1K tape and am not
interested in purchasing test equipment. Thanks.