Don't know, but I have an 8200 and it's one of the more useful things on my bench. Well worth putting into good shape. Mine uses a garden variety LM399, but it stays within a couple ppm for years at a time. The rotary switches on mine are a nightmare to keep working. DeOxit hasn't helped much. My next attempt will be total immersion of the switch board in the ultrasonic cleaner. I'm assuming it's the switches, not the following circuitry, but scoping the switches hasn't convinced me they're as bad as they seem.