GEORGE A. PHILBRICK RESEARCHES, INC.

photo copyright Doug Coward 2000

Model K2-W computing opamp George A. Philbrick Researches Boston, Massachusetts This is a general purpose computing opamp. First introduced in 1952.

Model K2 ELECTRONIC ANALOG COMPUTOR MODULES
Operational Amplifiers
Model	DC Open Loop Gain	Power	Input Voltage Range	Output Voltage Range	Drift Rate	Tubes
K2-W Operational Amplifier	15,000	±300vdc 6.3vac	±50vdc	±50vdc	±5mv per day	2 12AX7
K2-X Operational Amplifier	30,000	±300vdc 6.3vac	±50vdc	±100vdc	±5mv per day	1 12AX7 1 6AN8
Booster Amplifiers
Model	Gain	Power	Input Voltage Range	Output Voltage Range	Thermal Dissipation	Tubes
K2-B1 Booster Follower	About 0.8	±300vdc 6.3vac	±70vdc max	±55vdc	24 watts	2 6CM6
Stabilizing Amplifiers
Model	DC Open Loop Gain	Power	Output Offset	Output Voltage Range	Stability	Tube/Chopper
K2-P Stabilizing Amplifier	1000	+300vdc 6.3vac	Below 1mv	±130vdc	Below 0.1mv	1 12AX7 1 Airpax A175

Close up of two Philbrick P65 solid state operational amplifiers

Close up of the Model MP manifold patch panel

Model MP Solid State Operational Manifold George A. Philbrick Researches This is a small desktop manifold with a built-in +/- 15 vdc power supply and will accept up to four plug-in amplifiers.