NJ7P SQL Tube Database Query

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6AS8
Diode - Sharp-Cutoff Pentode

EIA Base & Outline

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in television and radio receiver applications. The pentode unit is used as an if amplifier, video amplifier, or agc amplifier.

Source ........................................ RCA RC-29 - 1975
The high-perveance diode is used as an audio detector, video detector, or dc restorer. Requires miniature 9-contact socket. For curve of average plate characteristics of pentode unit, see type 6AN8A.

Mechanical Data

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

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 100 V
Total DC and Peak ....................... 200 V
Heater Negative with Respect to Cathode
Total DC and Peak ....................... 200 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 7 pf
Output ........................................ 2.2 pf
Grid to Plate ................................. 0.04 pf

Diode
Source ........................................ RCA RC-29 - 1975
Output ........................................ 3.0 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Supply Voltage ..................... 300 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2.5 W
Grid No. 2 Dissipation ........................ 0.5 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 1M Ω
Self Bias .................................. 0.25M Ω

Diode
Source ........................................ RCA RC-29 - 1975
Peak Inverse Plate Voltage .................... 330 V
Steady State Peak Plate Current Each Plate .... 50 mA
Steady State DC Output Current Each Plate ..... 5 mA

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 300K Ω
Transconductance .............................. 6200 µ
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 3 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -8 V

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

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

Wed, 29 Mar 2023 05:30:18 -0700