B9A (Noval) base 9A pinout Twin Triodes

Disclaimer : No guarantee of accuracy of data or substitutes, check data before using a substitute

Typical Values / Maximum Ratings
Heater Current / Plate (Anode) Voltage / Grid Voltage / Plate Current / Plate Resist / Trans- cond. / Gain Factor / Plate Voltage / Cathode Current / Power
Type / Substitutes / Ih (mA) @12.6V / Va (Volts) / Vg (Volts) / Ia (mA) / Ra (kOhm) / S or gm
(mA/V) / mu / Va max / Ik max / Pa max / Comment
12AX7 / 150 / 250 / -2 / 1.2 / 62.5 / 1.6 / 100 / 300 / 8 / 1
12AX7-A / Low hum & microphonics version
12AX7-S
12AX7-WA
CV4004 / “special quality” shock and vibration resistant, higher max ratings
E83CC
M8137 / 330 / 1.2 / Shock and vibration resistant higher rated version
12AD7 / 225 / low hum and microphonic s version for low level audio preamplifier service. Higher heater current.
12AX7-R 12DF7
12DT7
CV10319
CV492
ECC83 / Identical or close
6057
6681 / 330 / Higher rated versions
7025
CV8156
CV8222
ECC803S / 330 / 1.2 / Low hum, higher rated
6L13
7382
7494
7729
B339
E2164
ECC803
ECC863
QB339 / Diff rating, no data sheet
Typical Values / Maximum Ratings
Heater Current / Plate (Anode) Voltage / Grid Voltage / Plate Current / Plate Resist / Trans- cond. / Gain Factor / Plate Voltage / Cathode Current / Power
Type / Substitutes / Ih (mA) @12.6V / Va (Volts) / Vg (Volts) / Ia (mA) / Ra (kOhm) / S or gm
(mA/V) / mu / Va max / Ik max / Pa max / Comment
12AT7 / 150 / 250 / -2 / 10 / 11 / 5.5 / 61 / 300 / 15 / 2.5
12AT7-WA
12AT7-WC
6060
6201
CV455
CV4024
CK6201
ECC801
M8162 / Ruggedized military/industrial or shock and vibration resistant versions. Higher max ratings. CK6201 equiv to 6201
CV10662
CV8154
CV9859
ECC81 / Identical or close
ECC801S / 330 / 2.8 / Shock and vibration resistant higher rated version
6679 / 330 / Higher rated version for use in mobile equipment
A2900 / 200 / 500 / 3.5 / Higher rated version
7492
7728
B152
B739
CC81E / Diff rating, no data sheet
E2157
E81CC
QA2406
QA2407
QS2406
B309 / 10 / 55 / Diff rating
Typical Values / Maximum Ratings
Heater Current / Plate (Anode) Voltage / Grid Voltage / Plate Current / Plate Resist / Trans- cond. / Gain Factor / Plate Voltage / Cathode Current / Power
Type / Substitutes / Ih (mA) @12.6V / Va (Volts) / Vg (Volts) / Ia (mA) / Ra (kOhm) / S or gm
(mA/V) / mu / Va max / Ik max / Pa max / Comment
12AU7 / 150 / 250 / -8.5 / 10.5 / 7.7 / 2.2 / 17 / 300 / 20 / 2.75
12AU7-A
6067 / Less microphonic version
12AU7-WA
6189
CV491
ECC802S
M8136 / Ruggedized military/industrial or shock resistant versions. Higher max ratings
5814
5814-A
CK5814
CV4016
CV9092 / 175 / 330 / 3 / Shock resistant low noise versions.
5963
CV3900 / 150 / 67.5 / 0 / 8.5 / 6.6 / 3.2 / 21 / 250 / 2.5 / Designed for long life computer applications. Lower ratings (works fine as a sub according to Retrovox)
6680 / 330 / Higher rated version for use in mobile equipment
CV10323
CV10666
CV4003
CV8155
CV8221
ECC82 / Identical or close
6CC40
7489
7730
B329
B749
E2163
E82CC
ECC802 / Diff rating, no data sheet
Typical Values / Maximum Ratings
Heater Current / Plate (Anode) Voltage / Grid Voltage / Plate Current / Plate Resist / Trans- cond. / Gain Factor / Plate Voltage / Cathode Current / Power
Type / Substitutes / Ih (mA) @12.6V / Va (Volts) / Vg (Volts) / Ia (mA) / Ra (kOhm) / S or gm
(mA/V) / mu / Va max / Ik max / Pa max / Comment
12AV7 / CV10175 / 225 / 150 / 18 / 4.8 / 8.5 / 41 / 300 / 2.7
12AY7 / 6072,
6072-A
CV2650, CV3650
CV8073 / 150 / 250 / -4 / 3 / 25 / 1.75 / 44 / 300 / 1.5 / 6072, 6072-A Low noise, low microphonic, ruggedised versions with higher heater current (175ma)
CV2650, 3650 are different rating, no data sheet
6072 equiv
12AZ7 / 12AZ7-A / 225 / 250 / 10 / 10.9 / 5.5 / 60 / 330 / 2.5 / 12AZ7-A Higher rated version
12AE7 / 450 / 12.6 / Dissimilar triodes. Designed for use in 12V car radios
12BH7 / 12BH7-A
CV5042 / 300 / 250 / -10.5 / 11.5 / 5.5 / 3.1 / 17 / 300 / 3.5 / 12BH7-A Controlled heater warmup version
12BZ7 / 300 / 250 / -2 / 2.5 / 31.8 / 3.2 / 102 / 300 / 1.5
12DM7 / 130 / 100 / -1 / 0.5 / 80 / 1.25 / 100
12DW7 / 7247 / 150 / 250 / -2/-8.5 / 1.2/10.5 / 62.5/7.7 / 1.6/2.2 / 100/17 / 330 / 1.2/3.3 / Dissimilar triode ½ 12AX7, ½ 12AU7. 7247 is ½ 7025, designed for hifi
12FV7 / 450 / 100 / 16 / 2.25 / 9.6 / 22 / 330 / 2.5
12U7 / 12.6 / Designed for use in 12V car radios
5721 / CV3970 / 250 / -2 / 1.2 / 62.5 / 1.6 / 100 / No data sheet
5751 / 5751-WA
CK5751
CK4017
CV8312 / 175 / 250 / -3 / 1 / 58 / 1.2 / 70 / 330 / 0.7 / 5751-WA Ruggedized military/industrial version.
5965 / 5965-A
CK5965
CV5843 / 225 / 150 / 8.2 / 7.25 / 6.5 / 47 / 300 / 15 / 2.2 / Designed for high speed computer applications.
5965-A higher rated.
6085 / CV5989
E80CC / 300 / 250 / -5.5 / 6 / 10 / 2.7 / 27 / 300 / 12 / 2
6211 / 6211-A / 150 / 100 / 4.6 / 7.5 / 3.6 / 27 / 200 / 16 / 1 / Designed for computer applications but not for low hum, microphony, noise.
6211-A higher rated
6414 / CK6414 / 225 / 180 / -2 / 8 / 7.65 / 5.5 / 42 / 200 / 2 / Designed for computer applications
6851 / 250 / 250 / 1 / 60 / 1.2 / 70 / 330 / 1
6913 / 150 / 11 / 3.9 / 4.8 / 18 / 300 / 3.5
6955 / 175 / 250 / -8.5 / 11.5 / 7 / 2.4 / 17
6AU7 / CV5052 / 6.3V heater 12AU7
7AU7 / 7V heater version of 12AU7
9AU7 / 9V heater version of 12AU7
7062 / CV8431
E180CC / 200 / 150 / -1.85 / 8.5 / 7.2 / 6.4 / 46 / 275 / 20 / 2 / Special quality designed for computer applications
7318
M8160 / No data
ECC99 / 5687, 6840, E182CC / 400 / 150 / -4 / 18 / 2.3 / 9.5 / 22 / 400 / 60 / 5