5881

ampage tube data		ampage tube data

5881
BEAM POWER TUBE

Pin Element

1 none

2 Heater (Filament)

3 Plate (Anode)

4 Screen Grid

5 Control Grid

6 none

7 Heater (Filament)

8 Cathode

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. For typical operation as push-pull
class A₁, class AB₁ (within maximum ratings), and class
AB₂ amplifier, refer to type 6L6GC .

Heater Voltage (AC/DC)	6.3	volts
Heater Current	0.9	ampere
Heater Warm-up Time (Average)	11	seconds

Peak Heater-Cathode Voltage
Heater negative with respect to cathode	200 max	volts
Heater positive with respect to cathode	200 max

Direct Interelectrode Capacitance (Approx.)
Grid No.1 to Plate	0.6	pf
Grid No.1 to Cathode, Heater, Grid No.2, and Grid No.3	10
Plate to Cathode, Heater, Grid Ho.2, and Grid No.3	6.5

CLASS A₁ AMPLIFIER

Maximum Ratings (Design Center Values)
Plate Voltage	400	volts
Grid-No.2 (Screen-Grid) Voltage	400	volts
Plate Dissipation	23	watts
Grid-No.2 Input	3	watts

Typical Operation
Plate Voltage	250	300	350	volts
Grid-No.2 Voltage	250	200	250
Grid-No.1 (Control-Grid) Voltage	-14	-12.5	-18
Peak AF Grid-No.1 Voltage	14	12.5	18
Zero-Signal Plate Current	75	48	53	ma
Maximum-Signal Plate Current	80	55	65
Zero-Signal Grid-No.2 Current	4.3	2.5	2.5
Maximum-Signal Grid-No.2 Current	7.6	4.7	8.5
Plate Resistance (Approx.)	30000	35000	48000	ohms
Transconductance	6100	5300	5200	umhos
Load Resistance	2500	4500	4200	ohms
Total Harmonic Distortion	10	11	13	%
Maximum-Signal Power Output	6.7	6.5	11.3	watts

CLASS A₁ AMPLIFIER - Triode Connection
(Grid No. 2 connected to plate)

Maximum Ratings (Design Center Values)
Plate Voltage	400	volts
Plate Dissipation	26	watts

Typical Operation
Plate Voltage	250	300	volts
Grid-No.1 (Control-Grid) Voltage	-18	-20
Peak AF Grid-No.1 Voltage	18	20
Zero-Signal Plate Current	52	78	ma
Maximum-Signal Plate Current	58	85	ma
Plate Resistance (Approx.)	1700		ohms
Amplification Factor	8
Transconductance	5250		umhos
Load Resistance	4000		ohms
Total Harmonic Distortion	6	5.5	%
Maximum-Signal Power Output	1.4	1.8	watts

Maximum Circuit Values
Grid No. 1 Circuit Resistance
For fixed-bias operation	0.1	megohm
For cathode-bias operation	0.5	megohm