(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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