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A horizontal ribbon.

6A8
Pentagrid Converter

EIA Base & Outline

EIA Base: 8AEIA Bulb: 8-4

Substitute Data

Preferred Substitutes ......................... 6D8
Source ........................................ RCA RC-13 - 1937

Application

Source ........................................ RCA RC-13 - 1937
Metal type used in superhetrodyne circuits. Requires octal socket.

Mechanical Data

Source ........................................ RCA RC-13 - 1937
Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal
EIA Outline ................................... 8-4
EIA Base ...................................... 8A
Top Cap ....................................... Miniature
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-13 - 1937
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Pentagrid
Source ........................................ RCA RC-13 - 1937
Grid No. 4 to Plate ........................... 0.03 pf
Grid No. 4 to Grid No. 2 ...................... 0.10 pf
Grid No. 4 to Grid No. 1 ...................... 0.09 pf
Grid No. 1 to Grid No. 2 ...................... 0.8 pf
Grid No. 4 to ALL (RF Input) .................. 12.5 pf
Grid No. 2 to All (Osc Output) ................ 5 pf
Grid No. 1 to All (Osc Input) ................. 6.5 pf
Plate to All (Mixer Output) ................... 12.5 pf

Maximum Ratings (Design Center Values)

Pentagrid
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 300 V
Grid No. 3 & 5 Voltage (Screen) ............... 100 V
Grid No. 2 Voltage (Anode) .................... 200 V
Grid No. 3 & 5 Supply Voltage (Screen) ........ 300 V
Grid No. 2 Supply Voltage (Anode) ............. 300 V
Plate Dissipation ............................. 1.0 W
Grid No. 3 & 5 Dissipation (Screen) ........... 0.3 W
Grid No. 2 Dissipation (Anode) ................ 0.75 W
Grid No. 4 Voltage
Positive Bias Value ........................ 0 V

Characteristics and Typical Operation

Converter
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 250 V
Grid No. 3 & 5 Voltage (Screen) ............... 100 V
Grid No. 4 Bias Voltage ....................... -3 V
Grid No. 1 Resistor ........................... 50K Ω
Plate Resistance (approx) ..................... 360K Ω
Conversion Transconductance ................... 550 µMho
Plate Current ................................. 3.5 mA
Grid No. 3 & 5 Current (Screen) ............... 2.7 mA
Grid No. 2 Current (Anode) .................... 4 mA
Grid No. 1 Current ............................ 0.4 mA

Converter
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 100 V
Grid No. 3 & 5 Voltage (Screen) ............... 50 V
Grid No. 2 Voltage (Anode) .................... 100 V
Grid No. 4 Bias Voltage ....................... -1.5 V
Grid No. 1 Resistor ........................... 50K Ω
Plate Resistance (approx) ..................... 600K Ω
Conversion Transconductance ................... 360 µMho
Plate Current ................................. 1.1 mA
Grid No. 3 & 5 Current (Screen) ............... 1.3 mA
Grid No. 2 Current (Anode) .................... 2 mA
Grid No. 1 Current ............................ 0.25 mA

Notes

Source ........................................ RCA RC-13 - 1937
1. Grid No. 2 supply voltages in excess of 200 volts require the use of a 20K ohm voltage-dropping resistor bypassed by a 0.1 mmfd capacitor.

A horizontal ribbon.

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A horizontal ribbon.

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Thu, 20 Jan 2022 16:01:04 -0700