Electronic tube type
Voltage - Dual Triode (dissimilar) vacuum tubes
Voltage - Dual Triode (dissimilar) records in Tube Tinker cover 17 tube designations, including 66 preserved original datasheets. Compare bases, sockets, heater requirements, construction, exact variations, and directional replacement options.
- Tube records
- 17
- Original datasheets
- 66
- Variation families
- 4
- Tubes with alternatives
- 6
About Voltage - Dual Triode (dissimilar) tubes
If the tube is a dissimilar dual triode that did not fall into any of the Power tube categories, then apply this. Do not assign vertical output tubes to this type, those go to vertical output.
Electrical range
- Nominal heater voltage
- 3.5–16.8 V
- Nominal heater current
- 0.15–0.8 A
Common voltage - dual triode (dissimilar) characteristics
These are the most frequently recorded attributes among tubes in this category.
Bases
- 12FQ2
- 7AU1
- 9A1
- 9AD1
- 9AJ1
Sockets
- B9A10
- B12C4
- IO1
Constructions
- Triode-Triode17
Voltage - Dual Triode (dissimilar) tube list
Page 1 of 1
12DW7 Triode-Triode
Dissimilar twin triode combining a high-mu voltage-amplifier section with a lower-mu, higher-current section, allowing voltage gain and driver functions within one envelope.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 12.6 V
- Sections
- 2
12DW7EH Triode-Triode
Modern dissimilar twin triode combining 12AX7-like high gain with 12AU7-like lower-mu current capability, useful where voltage amplification and driver functions are required together.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 6.3 V
- Sections
- 2
17JK8 Triode-Triode
Dissimilar twin triode for FM tuners, combining a frame-grid RF-amplifier section with a second triode intended for oscillator-mixer service.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 16.8 V
- Sections
- 2
3FW7 Triode-Triode
Medium-mu dual triode designed for VHF television and FM tuner frequency conversion, with one section serving as the local oscillator and the other as the mixer.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 3.5 V
- Sections
- 2
4HA7 Triode-Triode
Dissimilar Compactron double triode combining a high-mu section and a medium-mu section in one envelope, providing two substantially different voltage-amplifier characteristics for multifunction circuitry.
- Base
- 12FQ
- Socket
- B12C
- Heater
- 4.2 V
- Sections
- 2
4HC7 Triode-Triode
Dissimilar dual triode designed for television control functions, with one section used as a sync clipper and the other as a gated automatic-gain-control amplifier.
- Base
- Not recorded
- Socket
- B12C
- Heater
- 4.2 V
- Sections
- 2
5HA7 Triode-Triode
Dissimilar twin triode, documented as electrically identical to the 4HA7 except for heater characteristics, combining low- and high-mu sections for complementary circuit functions.
- Base
- 12FQ
- Socket
- B12C
- Heater
- 5.8 V
- Sections
- 2
5HC7 Triode-Triode
Dissimilar twin triode designed for television sync-clipper and gated-AGC amplifier service, combining sections of substantially different gain and current capability in one envelope.
- Base
- Not recorded
- Socket
- B12C
- Heater
- 5.6 V
- Sections
- 2
6BK7B Triode-Triode
Medium-mu twin triode for cascode VHF tuner and RF amplifier service, with characteristics tailored to high-frequency receiving applications.
- Base
- 9AJ
- Socket
- B9A
- Heater
- 6.3 V
- Sections
- 2
6JK8 Triode-Triode
Dissimilar twin triode for FM tuner service, combining a frame-grid RF amplifier section with a second triode used for oscillator-mixer frequency conversion.
- Base
- 9AD
- Socket
- B9A
- Heater
- 6.3 V
- Sections
- 2
6N6G Triode-Triode
Direct-coupled dual-triode power-amplifier tube for audio-frequency output service, providing about 4 watts Class-A output.
- Base
- 7AU
- Socket
- IO
- Heater
- 6.3 V
- Sections
- 2
7247 Triode-Triode
Dissimilar twin triode combining a high-mu voltage-amplifier section with a lower-mu, higher-current section, intended for audio and general amplifier circuits requiring two different gain characteristics.
- Base
- 9A
- Socket
- B9A
- Heater
- 6.3 V
- Sections
- 2
7308 Triode-Triode
Premium long-life, high-reliability version of the VHF cascode twin-triode family, designed for low-noise high-frequency amplification and demanding professional service.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 6.3 V
- Sections
- 2
7FC7 Triode-Triode
Frame-grid double triode designed for cascode RF amplification to approximately 220 MHz, combining two high-frequency sections for VHF receiver and television front-end service.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 7.2 V
- Sections
- 2
8JK8 Triode-Triode
Dissimilar dual triode for FM tuners, combining a frame-grid RF amplifier section with an oscillator/mixer section to perform tuner amplification and frequency conversion.
- Base
- Not recorded
- Socket
- Not recorded
- Heater
- 8.4 V
- Sections
- 2
ECC832 Triode-Triode
Dissimilar audio twin triode combining one high-mu ECC83-type section with one medium-mu ECC82-type section for circuits requiring different gain characteristics in one envelope.
- Base
- Not recorded
- Socket
- B9A
- Heater
- 12.6 V
- Sections
- 2
YCC189 Triode-Triode
YCC189 voltage - dual triode (dissimilar) electronic tube specifications and datasheets.
- Base
- Not recorded
- Socket
- Not recorded
- Heater
- 5.6 V
- Sections
- 2