NJ7P SQL Tube Database Query

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6SB7Y
Heptode Converter

EIA Base & Outline

Application

Source ........................................ RCA DS 11/20/45
Metal type used as converter in superhetrodyne circuits. Because of its high conversion and oscillator transconductance, it is especially useful in FM converter service in the 100 MHz region.

Source ........................................ RCA DS 11/20/45
It has a micanol base which minimizes drift in oscillator frequency during warm-up period. Requires octal socket and may be mounted in any position.

Mechanical Data

Source ........................................ RCA DS 11/20/45
Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 8-Pin Micanol
EIA Outline ................................... 8-1
EIA Base ...................................... 8R
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA DS 11/20/45
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Pentagrid
Source ........................................ RCA DS 11/20/45
Grid No. 3 to Plate ........................... 0.13 pf
Grid No. 3 to Grid No. 1 ...................... 0.16 pf
Grid No. 1 to Plate ........................... 0.06 pf
Grid No. 3 to All (RF Input) .................. 9.6 pf
Grid No. 1 to ALL (Osc Input) ................. 7.3 pf
Plate to All (Mixer Output) ................... 9.2 pf
Grid No. 1 to Cathode ......................... 3.4 pf
Cathode to All Except Grid No. 1 .............. 4.5 pf
Grid No. 1 to All Except Cathode .............. 3.8 pf

Maximum Ratings (Design Center Values)

Pentagrid
Source ........................................ RCA DS 11/20/45
Plate Voltage ................................. 300 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
Grid No. 3 Voltage
Negative Bias Value ........................ 100 V
Positive Bias Value ........................ 0 V

Characteristics and Typical Operation

Mixer (Separate Excitation)
Source ........................................ RCA DS 11/20/45
Plate Voltage ................................. 100 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... -1.0 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 DS 11/20/45
Plate Voltage ................................. 250 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 3 Bias Voltage ....................... -1.0 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

Mixer
Source ........................................ RCA DS 11/20/45
Plate Voltage ................................. 250 V
Grid No. 2 & 4 Voltage (Screen) ............... 100 V
Grid No. 1 Resistor ........................... 22K Ω
Plate Current ................................. 6.5 mA
Grid No. 2 & 4 Current (Screen) ............... 12.5 mA
Grid No. 1 Current ............................ 0.14 mA

Notes

Source ........................................ RCA DS 11/20/45
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, 15 Aug 2022 17:13:50 -0700