6AL5

6AL5 Tube

The 6AL5/12AL5  (European: EAA91/EB91/HAA91) (P/N 154-016,154-0016-00,154-0038-00) is a high-perveance dual diode vacuum tube with a 6.3 V, 0.3 A heater.
The 12AL5 (European type HAA91) is the same but has a 12.6 V, 0.15 A heater. Both have a B9A (Noval) miniature 9-pin base.

The 6AL5/12AL5 serves as the as the "disconnect diode" in the timebase circuit of many tube-era Tektronix scopes starting with the 511 in the 1940s and continuing through the 1960s in sweep plug-ins such as the 3B2 and other plug-ins such as Type C/Type CA.

Tek part number: 154-0016-00 (6AL5), 154-0038-00 (12AL5/HAA91)

Aged/Checked/Matched Pair Details
Used in	Tek Part#	S/N Range
535A, 545A, 585A	157-0075-00 (12AL5)	All
316, 317, 502A, 516	157-0104-00 (6AL5)	All
53X, 54X series, 551, 580	157-0104-02 (6AL5)	All

Reference:

Tube aging procedure / Selection and checking procedure

Some instruments using part 6AL5

Instrument	Manufacturer	Class	Model	Description	Introduced
163	Tektronix	Plug-in	163	Pulse Generator Module	1952
181	Tektronix	Pulse generator	181	Time-mark generator	1955
190	Tektronix	Signal generator	190	Constant-Amplitude Signal Generator	1954
1M1	Tektronix	Plug-in	1M1	Calibration plug-in	1964
310	Tektronix	Oscilloscope	310A	4 MHz oscilloscope	1955
310A	Tektronix	Oscilloscope	310A	4 MHz oscilloscope	1959
315	Tektronix	Oscilloscope	315	"Portable" tube scope	1952
316	Tektronix	Oscilloscope	316	10 MHz 3" tube scope	1959
317	Tektronix	Oscilloscope	317	10 MHz 3" tube scope	1959
3B1	Tektronix	Plug-in	3B1	10 MHz time base plug-in	1962
3B1S	Tektronix	Plug-in	3B1S	Sampling time base plug-in	1961
3B2	Tektronix	Plug-in	3B2	Delaying timebase plug-in	1963
3B3	Tektronix	Plug-in	3B3	Time Base plug-in	1962
3B5	Tektronix	Plug-in	3B5	Automatic time base plug-in	1966
502	Tektronix	Oscilloscope	502	1 MHz dual beam differential scope	1958
502A	Tektronix	Oscilloscope	502A	1 MHz dual beam differential scope	1963
503	Tektronix	Oscilloscope	503	450 kHz differential-input scope	1960
511	Tektronix	Oscilloscope	511	10 MHz Tube scope First Tektronix oscilloscope	1947
511A	Tektronix	Oscilloscope	511A	10 MHz Tube scope	1948
512	Tektronix	Oscilloscope	512	Early 2 MHz scope	1948
516	Tektronix	Oscilloscope	516	15 MHz dual-trace scope	1960
517	Tektronix	Oscilloscope	517	50 MHz scope	1951
524	Tektronix	Oscilloscope	524AD	TV waveform monitoring scope	1953
526	Tektronix	Audio/Video	526	NTSC Vectorscope	1959
535	Tektronix	Oscilloscope	535	10 (15) MHz dual-timebase scope	1954
545	Tektronix	Oscilloscope	545	30 (33) MHz oscilloscope	1955
545A	Tektronix	Oscilloscope	545A	30 (33) MHz oscilloscope	1959
549	Tektronix	Oscilloscope	549	30 MHz storage oscilloscope	1965
551	Tektronix	Oscilloscope	551	27 MHz scope	1958
565	Tektronix	Oscilloscope	565	10 MHz dual-beam scope	1962
570	Tektronix	Curve Tracer	570	Curve tracer for tubes	1955
581	Tektronix	Oscilloscope	581	100 (95) MHz oscilloscope	1959
581A	Tektronix	Oscilloscope	581A	85 MHz oscilloscope	1963
585	Tektronix	Oscilloscope	585	100 (95) MHz oscilloscope	1959
585A	Tektronix	Oscilloscope	585	85 MHz oscilloscope	1963
C	Tektronix	Plug-in	Type (53)C	Dual-trace 8.5 (24) MHz amplifier	1954
T	Tektronix	Plug-in	Type T	Timebase plugin	1957
Telequipment D52	Telequipment	Oscilloscope	D52	6 MHz dual-beam scope	1968
Telequipment D56	Telequipment	Oscilloscope	D56	15 MHz 2-ch scope	(?)
Telequipment S52	Telequipment	Oscilloscope	S52	3 MHz dual-channel scope	1968

Data and Links

• System: max. 420 V peak, max. 9 mA, 2.5 pF
• RCA 6AL5 Datasheet (PDF)
• 6AL5 / 12AL5 @ radiomuseum.org