NJ7P SQL Tube Database Query

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6HZ8
High-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9DXEIA Bulb: 9-77

Substitute Data

Preferred Substitutes ......................... 6JE8
Substitutes ................................... 6CX8 6EB8 6GN8 6HF8 6KV8
Source ........................................ RCA RC-27 - 1973

Mechanical Data

Source ........................................ RCA RC-27 - 1973
Bulb .......................................... T-9
EIA Outline ................................... 9-77
EIA Base ...................................... 9DX

Electrical Data

Source ........................................ RCA RC-27 - 1973
Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.125 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-27 - 1973
Input ......................................... 12 pf
Output ........................................ 5 pf
Grid to Plate ................................. 0.1 pf

Triode
Source ........................................ RCA RC-27 - 1973
Input ......................................... 3.8 pf
Output ........................................ 0.4 pf
Grid to Plate ................................. 5 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 8.0 W
Grid No. 2 Dissipation ........................ 2.0 W

Triode
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 1.0 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 200 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 70
Transconductance .............................. 4K µMho
Plate Current ................................. 3.5 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 170 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Plate Resistance (approx) ..................... 140K Ω
Transconductance .............................. 12.6K µMho
Plate Current ................................. 29 mA
Grid No. 2 Current ............................ 6 mA

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Tue, 29 Nov 2022 20:21:29 -0700