George A. Philbrick Researches GAP/R K2-W Operational Amplifier, TESTED, NO KEY For Sale

George A. Philbrick Researches GAP/R K2-W Operational Amplifier, TESTED, NO KEY


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George A. Philbrick Researches GAP/R K2-W Operational Amplifier, TESTED, NO KEY:
$39.00

George A. Philbrick Researches GAP/R K2-W Operational Amplifier. With 2 good TESTED 12AX7A tubes.
Key is broken off, still usable if carefully eyeballed while inserting into octal socket.
Powered up & TESTED OK with 6.3 VAC 60 Hz & +/- 300 VDC power supplies, Vin = 5 Volts peak to peak, Ri = 10K, Rf = 200K, Vout = 100 V peak to peak clean & steady.
Datasheet: 300 VDC power supply:
Power transformer requires 700 VCT + 6.3 VAC - need 1See item # 193593156359 for 2 1000UF 450VDC capacitors - need 2See item # 294188695394 for 5 1N4007 power supply diodes - need 4 for fullwave bridge rectifierSee item # 265612360739 for 20 Hy 115 mA power supply filter choke - need 1Use 100 kOhm 2 Watt resistors across the capacitors for bleeders - need 2
43+ minute power it up & run it (K2-W):


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