(RCA HB-3 data courtesy Paul Bigelow and John Shriver) RCA Tenative Data June 20, 1946 26A6 RF-AMPLIFIER PENTODE Miniature Remote Cutoff Type GENERAL DATA Electrical: Heater, for Unipotential Cathode: Voltage.............. 26.5 ac or dc volts Current.............. 0.07 amp Direct interelectrode Capacitance:* Grid #1 to Plate .0035 max uuf Input 6.0 uuf Output 5.0 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........7BK1 Pin Electrode 1 Grid #1 2 Grid #3, internal shield 3 Heater 4 Heater 5 Plate 6 Grid #2 7 Cathode CLASS A1 AMPLIFIER Maximum Ratings, Design-Center Values: PLATE VOLTAGE.......................... 250 max volts GRIDS No. 2 (SCREEN) VOLTAGE........... 100 max volts GRIDS No. 2 SUPPLY VOLTAGE............. 300 max volts PLATE DISSIPATION...................... 3.0 max watt GRIDS No. 2 DISSIPATION................ 0.4 max watt TOTAL CATHODE CURRENT.................. 14 max ma GRID No. 1 (CONTROL GRID) VOLTAGE: Negative bias value................. 50 max volts Positive bias value................. 0 max volts PEAK HEATER-CATHODE VOLTAGE: Heater negative w.r.t cathode....... 90 max volts Heater positive w.r.t cathode....... 90 max volts Typical Operation and Characteristics: Plate Voltage 26.5 250 volts Grid #3 (suppressor) connected to cathode at socket Grid #2 26.5 100 volts Grid #1 Voltage: from grid #1 resistor 2 megohms from cathode resistor 125 ohms Plate Resistance 0.25 1.0 megohm Transconductance 2000 4000 umhos Grid #1 bias for transconductance of 40 umhos -25 volts Grid #1 bias for transconductance of 20 umhos -8 volts Plate Current 1.7 10.5 ma Grid #2 Current 0.7 4.0 ma
Average Plate Characteristics 0-80 volts
Average Plate Characteristics 0-400 volts