(RCA HB-3 data courtesy Paul Bigelow and John Shriver)
RCA Tenative Data June 20, 1946
26C6 DUPLEX DIODE TRIODE
GENERAL DATA
Electrical:
Heater, for Unipotential Cathode: Voltage.............. 26.5 ac or dc volts Current.............. 0.07 amp Direct interelectrode Capacitance:* Grid to Plate 2.0 uuf Grid to Cathode & Heater 1.8 uuf Plate to Cathode & Heater 1.4 uuf * with external shield connected to cathode
Mechanical:
Mounting Position............. Any Maximum Overall Length 2-1/8" Maximum Seated Length 1-7/8" Length from Base Seat to Bulb Top (excluding tip) 1-1/2" +/- 3/32" Maximum Diameter 3/4" Bulb T-5-1/2 Base Miniature Button 7-Pin Basing Designation for BOTTOM VIEW........7BT Pin Electrode 1 Triode Grid 2 Cathode 3 Heater 4 Heater 5 Diode Plate No. 2 6 Diode Plate No. 1 7 Triode Plate
TRIODE UNIT - Class A1 AMPLIFIER
Maximum Ratings, Design-Center Values: PLATE VOLTAGE.......................... 250 max volts PLATE DISSIPATION...................... 2.5 max watt PEAK HEATER-CATHODE VOLTAGE: Heater negative w.r.t cathode....... 90 max volts Heater positive w.r.t cathode....... 90 max volts
Characteristics Plate Voltage 26.5 250 volts Grid Voltage: from fixed supply ---- -9 volts from grid resistor 2.0 megohms Amplification Factor 17 16 Plate Resistance 15.5K 8.5K ohms Transconductance 1100 1900 umhos Plate Current 1.1 9.5 ma
Typical Operation with Resistance Coupling: See RESISTANCE-COUPLED AMPLIFIER CHART, Type 6R7
DIODE UNITS -- Two
The two diode plates are placed around a cathode, the sleeve of which is common to the triode unit. Each diode plate has its own base pin. Diode curves in the front of the RECEIVING TUBE SECTION apply to the 26C6.
Additional curves applying to the 26C6 are shown under Types 6R7 and 6SR7.
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