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6SA7
Pentagrid Converter

EIA Base & Outline

EIA Base: 8REIA Bulb: 8-1

Substitute Data

Preferred Substitutes ......................... 6SB7
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Metal type used as converter in superhetrodyne circuits. Similar in performance to 6BE6. Tube has excellent frequency stability. Requires octal socket.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 8-Pin
EIA Outline ................................... 8-1
EIA Base ...................................... 8R
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 90 V
Heater Negative with Respect to Cathode
DC Component ............................ 90 V

Direct Interelectrode Capacitances (approx)

Pentagrid
Source ........................................ RCA RC-15 - 1947
Grid No. 3 to Plate ........................... 0.13 pf
Grid No. 3 to Grid No. 1 ...................... 0.15 pf
Grid No. 1 to Plate ........................... 0.06 pf
Grid No. 3 to All (RF Input) .................. 9.5 pf
Grid No. 1 to ALL (Osc Input) ................. 7.0 pf
Plate to All (Mixer Output) ................... 12.0 pf

Maximum Ratings (Design Center Values)

Pentagrid
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 300 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 2 & 4 Supply Voltage (Screen) ........ 300 V
Cathode Current ............................... 14 mA
Plate Dissipation ............................. 1.0 W
Grid No. 2 & 4 Dissipation (Screen) ........... 1.0 W

Characteristics and Typical Operation

Mixer (Self-Excited)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... 0 V
Grid No. 1 Resistor ........................... 20K Ω
Plate Resistance (approx) ..................... 1M Ω
Conversion Transconductance ................... 450 µMho
Plate Current ................................. 3.5 mA
Grid No. 2 & 4 Current (Screen) ............... 8.5 mA
Grid No. 1 Current ............................ 0.5 mA
Total Cathode Current ......................... 12.5 mA

Mixer (Self-Excited)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 100 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... 0 V
Grid No. 1 Resistor ........................... 20K Ω
Plate Resistance (approx) ..................... 500K Ω
Conversion Transconductance ................... 425 µMho
Plate Current ................................. 3.3 mA
Grid No. 2 & 4 Current (Screen) ............... 8.5 mA
Grid No. 1 Current ............................ 0.5 mA
Total Cathode Current ......................... 12.3 mA

Mixer (Ext-Excited)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... -2 V
Grid No. 1 Resistor ........................... 20K Ω
Plate Resistance (approx) ..................... 1M Ω
Conversion Transconductance ................... 450 µMho
Plate Current ................................. 3.5 mA
Grid No. 2 & 4 Current (Screen) ............... 8.5 mA
Grid No. 1 Current ............................ 0.5 mA
Total Cathode Current ......................... 12.5 mA

Mixer (Ext-Excited)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 100 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... -2 V
Grid No. 1 Resistor ........................... 20K Ω
Plate Resistance (approx) ..................... 500K Ω
Conversion Transconductance ................... 425 µMho
Plate Current ................................. 3.3 mA
Grid No. 2 & 4 Current (Screen) ............... 8.5 mA
Grid No. 1 Current ............................ 0.5 mA
Total Cathode Current ......................... 12.3 mA

Notes

Source ........................................ RCA RC-15 - 1947
1. Characteristics are approximate only and are shown for a Hartlet circuit with a feedback of approximately 2 volts peak in the cathode circuit.

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Fri, 19 Aug 2022 23:20:08 -0700