There were 8 total models of the ARP Odyssey. Some with
major changes and some with small changes.
The Models are:


2800 model 1 (1972)
have boards inside # A-1,B-1, C-1 & PWR SUP-1
mainly white face, few rare black face units
could be upgraded or modifed to have the PPC,
using mod kit 6800501 from ARP.
could also have the interface jacks by putting the ARP mod kit # 6800101.
pitch change by a knob.
Wrap around vinyl bottom cover.
used 12 DB/octave filter (4023)


2810-2811-2812-2813-2815 model 2
have boards inside # A-II,B-II, C-II & PWR SUP-II
Some Odyssey-2 models employ the older style B-1 board
pitch change by a knob.
black faced with gold lettering.
many upgraded or modifed to have the PPC,
using mod kit 6800301 from ARP. & some later units had PPC from factory.
new style power switch.
Wrap around vinyl bottom cover
used 24 DB/octave filter (4035 or 4075)
Improved S/H memory circuit design.
better power supply.


2820-2823 model 3 (1978)
have boards inside # A-II,B-II, C-II & PWR SUP-II
Black with orange face plate.
steel chassis with leather end blocks.
PPC for pitch bend & modulation.
used 24 DB/octave filter (4075)