Clear-Com offers a range of partyline system power suppliesPK-7 - 1 channel PS-702 - 2 channelPS-704 - 4 channel
PK-7 (current) The PK-7 power supply will support up to 8 partyline beltpacks. It is line and load regulated and short-circuit protected.
Obsolete units
PK-5
PK-3
This is a single channel power supply. It has the intercom termination network permanently installed in the unit (this termination is not switchable like the other power supplies and mainstations).
You cannot use multiple PK-7/PK-5/PK-3 because of the permanent termination (you'll double terminate the intercom line).
Please contact our Sales Department if there are any questions or if you model is not listed above.
http://www.clearcom.com/product/partyline/power-supplies