(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.

26C6 Characteristic Curves

Average Plate Characteristics