NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

6HF8
High-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9DXEIA Bulb: 6-3

Substitute Data

Preferred Substitutes ......................... 6EB8 6GN8
Substitutes ................................... 6HZ8 6LY8 6JE8 6JT8 6JV8 6KR8A 6KV8 6LQ8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in color and bw tv receiver applications. The triode is used in sound-if stages, sync-separator, sync-clipper and phase-inverter circuits; the pentode is used as a video amplifier. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-3
EIA Base ...................................... 9DX

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.78 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 10 pf
Output ........................................ 4.2 pf
Grid to Plate ................................. 0.1 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.8 pf
Output ........................................ 2.6 pf
Grid to Plate ................................. 3.5 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 5 W
Grid No. 2 Dissipation ........................ 1.1 W

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 70
Plate Resistance (approx) ..................... 17.5K Ω
Transconductance .............................. 4000 µMho
Plate Current ................................. 4 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Plate Resistance (approx) ..................... 75K Ω
Transconductance .............................. 12.5K µMho
Plate Current ................................. 25 mA
Grid No. 2 Current ............................ 7 mA

A horizontal ribbon.

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A horizontal ribbon.

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Tue, 31 Jan 2023 09:19:36 -0700