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A horizontal ribbon.

8417
Beam Power Tube

EIA Base & Outline

EIA Base: 8LYEIA Bulb: 12-16
Source ........................................ RCA RC-29 - 1975

Application

Glass octal type used as output amplifier in high-fedelity, high-power sound systems. Requires octal socket.

Mechanical Data

Bulb .......................................... T-12
EIA Outline ................................... 12-16
EIA Base ...................................... 8LY

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.6 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
DC Component ............................ 100 V
Total DC and Peak ....................... 200 V

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 660 V
Grid No. 2 Voltage ............................ 500 V
Plate Dissipation ............................. 35 W
Grid No. 2 Dissipation ........................ 5 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -12 V
Plate Resistance (approx) ..................... 16K Ω
Transconductance .............................. 23K µMho
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 5.5 mA
Grid No. 1 Voltage for Ib ..................... 1000 µa @ -37 V

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 560 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -15.5 V
Peak Grid No. 1 Voltage........................ 31 V
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 270 mA
Grid No. 2 Current (Zero Signal) .............. 3.4 mA
Grid No. 2 Current (Maximum Signal) ........... 31 mA
Load Resistance ............................... 4.2K Ω
Power Output (approx) ......................... 100 W
Total Harmonic Distortion ..................... 2.0 %

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 275 V
Grid No. 1 Voltage ............................ -13 V
Peak Grid No. 1 Voltage........................ 24 V
Plate Current (Zero Signal) ................... 150 mA
Plate Current (Maximum Signal) ................ 294 mA
Grid No. 2 Current (Zero Signal) .............. 4.4 mA
Grid No. 2 Current (Maximum Signal) ........... 34 mA
Load Resistance ............................... 2.8K Ω
Power Output (approx) ......................... 65 W
Total Harmonic Distortion ..................... 2.5 %

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A horizontal ribbon.

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Mon, 27 Jun 2022 11:26:22 -0700