NJ7P SQL Tube Database Query

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6BA7
Pentagrid Converter

EIA Base & Outline

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used as converter in AM and FM receivers. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-3
EIA Base ...................................... 8CT
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Pentagrid
Source ........................................ RCA RC-29 - 1975
Grid No. 3 to Plate ........................... 0.19 pf
Grid No. 3 to Grid No. 1 ...................... 0.1 pf
Grid No. 1 to Plate ........................... 0.05 pf
Grid No. 3 to All (RF Input) .................. 9.5 pf
Grid No. 1 to ALL (Osc Input) ................. 6.7 pf
Plate to All (Mixer Output) ................... 8.3 pf
Grid No. 1 to Cathode ......................... 3.3 pf
Cathode to All Except Grid No. 1 .............. 4.0 pf
Grid No. 1 to All Except Cathode .............. 3.4 pf

Maximum Ratings (Design Center Values)

Pentagrid
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 30 V
Grid No. 5 & Internal Shield .................. 0 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 2 & 4 Supply Voltage (Screen) ........ 300 V
Cathode Current ............................... 22 mA
Plate Dissipation ............................. 2.0 W
Grid No. 2 & 4 Dissipation (Screen) ........... 1.5 W

Characteristics and Typical Operation

Mixer - Separate Excitation
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 5 & Internal Shield Voltage .......... 0 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... -1 V
Grid No. 1 Resistor ........................... 20K Ω
Plate Resistance (approx) ..................... 500K Ω
Conversion Transconductance ................... 900 µ
Plate Current ................................. 3.6 mA
Grid No. 2 & 4 Current (Screen) ............... 10.2 mA
Grid No. 1 Current ............................ 0.35 mA
Total Cathode Current ......................... 14.2 mA

Mixer - Separate Excitation
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 5 & Internal Shield Voltage .......... 0 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... -1 V
Grid No. 1 Resistor ........................... 20K Ω
Plate Resistance (approx) ..................... 1M Ω
Conversion Transconductance ................... 950 µ
Plate Current ................................. 3.8 mA
Grid No. 2 & 4 Current (Screen) ............... 10 mA
Grid No. 1 Current ............................ 0.35 mA
Total Cathode Current ......................... 14.2 mA

Notes

Source ........................................ RCA RC-29 - 1975
1. The characteristics shown with separate excitation correspond very closely with those obtained in a self-excited circuit operating with zero bias.

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(c) 1994-2021 by William A. Beech, NJ7P

Mon, 30 Jan 2023 02:11:51 -0700