The Wonderful 6L6 Valve


6L6 - 6L6 GC
BEAM POWER TUBE
PinElement
1Shell-6L6 none-6L6GC
2Heater (Filament)
3Plate (Anode)
4Screen Grid
5Control Grid
6none
7Heater (Filament)
8Cathode
 Metal type 6L6 and glass octal type
6L6-GC are used in the output stage of
audio amplifying equipment, especially
units designed to have ample reserve of
power-delivering ability. These tubes
provide high power output, sensitivity,
and high efficiency. Power output at all
levels has low third- and higher-order
harmonics. Tubes require octal socket
and may be mounted in any position. It
is especially important that these tubes,
like other power-handling tubes, be
adequately ventilated. Type 6L6-GC
may be supplied with pin No.1 omitted.
Heater Voltage (AC/DC) 6.3volts
Heater Current0.9ampere
Heater Warm-up Time (Average)11seconds
Peak Heater-Cathode Voltage6L66L6-GC
Heater negative with respect to cathode180 max200 maxvolts
Heater positive with respect to cathode180 max200 max
Direct Interelectrode Capacitance (Approx.)6L6 º 6L6-GC
Grid No.1 to Plate0.40.6pf
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.31010
Plate to Cathode, Heater, Grid Ho.2, and Grid No.3126.5
º With pin 1 connected to pin 8.
CLASS A1 AMPLIFIER
Maximum Ratings6L6
Design
Center
Values		6L6GC
Design
Maximum
Values
Plate Voltage360500volts
Grid-No.2 (Screen-Grid) Voltage270450
Plate Dissipation1930watts
Grid-No.2 Input2.55
Typical Operation
Plate Voltage250300350volts
Grid-No.2 Voltage250200250
Grid-No.1 (Control-Grid) Voltage-14-12.5-18
Peak AF Grid-No.1 Voltage1412.518
Zero-Signal Plate Current724854ma
Maximum-Signal Plate Current795566
Zero-Signal Grid-No.2 Current52.52.5
Maximum-Signal Grid-No.2 Current7.34.77
Plate Resistance (Approx.)225003500033000ohms
Transconductance600053005200umhos
Load Resistance250045004200ohms
Total Harmonic Distortion101115%
Maximum-Signal Power Output6.56.510.8watts
CLASS A1 AMPLIFIER - Triode Connection
(Grid No. 2 connected to plate)
Maximum Ratings6L6
Design
Center
Values		6L6GC
Design
Maximum
Values
Plate Voltage275450volts
Plate Dissipation1930watts
Typical Operation
Plate Voltage250volts
Grid-No.1 (Control-Grid) Voltage-20
Peak AF Grid-No.1 Voltage20
Zero-Signal Plate Current40ma
Maximum-Signal Plate Current44
Plate Resistance (Approx.)1700ohms
Amplification Factor8
Transconductance4700umhos
Load Resistance5000ohms
Total Harmonic Distortion5%
Maximum-Signal Power Output1.4watts
PUSH-PULL CLASS A1 AMPLIFIER
Maximum Ratings6L6
Design
Center
Values		6L6GC
Design
Maximum
Values
Plate Voltage360500volts
Grid-No.2 (Screen-Grid) Voltage270450
Plate Dissipation1930watts
Grid-No.2 Input2.55
Typical Operation
(Values are for two tubes)
Plate Voltage250270volts
Grid-No.2 Voltage Voltage250270
Grid-No.1 Voltage-16-17.5
Peak AF Grid-No.1-to Grid No.1 Voltage3235
Zero-Signal Plate Current120134ma
Maximum-Signal Plate Current140155
Zero-Signal Grid No.2 Current1011
Maximum-Signal Grid No.2 Current1617
Effective Load Resistance (Plate-to-plate)50005000ohms
Total Harmonic Distortion22%
Maximum-Signal Power Output14.517.5watts
PUSH-PULL CLASS AB1 AMPLIFIER
Maximum Ratings6L6
Design
Center
Values		6L6GC
Design
Maximum
Values
Plate Voltage360500volts
Grid-No.2 (Screen-Grid) Voltage270450
Plate Dissipation1930watts
Grid-No.2 Input2.55
Typical Operation
(Values are for two tubes)		6L66L6GC
Plate Voltage360360450volts
Grid-No.2 Voltage270270400
Grid-No.1 (Control-Grid) Voltage-22.5-22.5-37
Peak AF Grid-No.1-to-Grid No.1 Voltage454570
Zero-Signal Plate Current8888116ma
Maximum-Signal Plate Current132140210
Zero-Signal Grid-No.2 Current555.6
Maximum-Signal Grid-No.2 Current151122
Effective Load Resistance (Plate-to-plate)660038005600ohms
Total Harmonic Distortion221.8%
Maximum-Signal Power Output26.51855watts
PUSH-PULL CLASS AB2 AMPLIFIER
Maximum Ratings6L6
Design
Center
Values		6L6GC
Design
Maximum
Values
Plate Voltage360500volts
Grid-No.2 (Screen-Grid) Voltage270450
Plate Dissipation1930watts
Grid-No.2 Input2.55
Typical Operation
(Values are for two tubes)
Plate Voltage360360volts
Grid-No.2 Voltage225270
Grid-No.1 (Control-Grid) Voltage-18-22.5
Peak AF Grid-No.1-to-Grid No.1 Voltage5272
Zero-Signal Plate Current7888ma
Maximum-Signal Plate Current142205
Zero-Signal Grid-No.2 Current3.55
Maximum-Signal Grid-No.2 Current1116
Effective Load Resistance (Plate-to-plate)60003800ohms
Total Harmonic Distortion22%
Maximum-Signal Power Output3147watts
Maximum Circuit Values
Grid No. 1 Circuit Resistance
For fixed-bias operation0.1megohm
For cathode-bias operation0.5

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