6B4triodeThe 6B4G is an unusual valve in that the envelope holds two triode valves that are hard wired in parallel. This was the American answer to the PX4.
6B4 GTtriodeThe 6B4G is an unusual valve in that the envelope holds two triode valves that are hard wired in parallel. This was the American answer to the PX4.
6B8 MVT-93double diode – pentodeDouble-Diode, Semi-Remote Cutoff Pentodes. Based on type 2B7 which had a 2.5 volt heater. Type 6B7 has a UX7 base with a top-cap connection for the control grid (grid 1). Type 6B8 has an octal base with a top cap. The diode plates are most commonly used as (second) detectors and AVC rectification in superheterodyne receivers. Because their control grids have both sharp cutoff and remote cutoff characteristics, these types were used as I.F. amplifiers with AVC bias to the control grid, and as A.F. amplifiers. These types were also used in reflex radios. In a typical 2B7/6B7/6B8 reflex circuit, the I.F. signal from the converter is injected into the pentode and is amplified. The diodes then act as detectors, separating the A.F. signal from the R.F. signal. The A.F. signal is then re-injected into the pentode, amplified, and sent to the audio output tube.[6]
6BA6EF93pentodeMedium Cutoff R.F. Pentode (Often encountered in Car Radios)
6BA8 Aminiature dual-function vacuum tube, featuring both a triode and a pentode section within a single envelope. It is commonly used in television receiver applications. The pentode section can be employed as a video amplifier, AGC amplifier, or reactance tube, while the triode section is suitable for low-frequency oscillator and phase-splitter circuits.

6BC7Noval, 9 pin miniature (USA pico-9) B9A Triple diode in miniature bulb, noval base. 12mA max dc current per diode.
6BD7 AEBC81Double Diode-Triode, Noval, 9 pin miniature (USA pico-9) B9A and Audio Frequency shown. Radio tubes are valves.
6BE67036Pentagrid Converter (Often encountered in Car Radios
6BE6EK90Pentagrid Converter (Often encountered in Car Radios
6BH6E90CCVacuum Pentode RF/IF-Stage – miniature sharp-cutoff pentode primarily designed for use as a high-gain radio-frequency or intermediate-frequency amplifier
6BJ7Triple Diode – A good choice for phase inverters, reverb drivers, and general preamp use. This tube offers low noise, low microphonics, and warm smooth tones
6BK7 B SYLDual Triode with Internal shield between each section, used in RF circuits (Similar to 6BQ7)
6BL7 GTThe 6BL7-GTA is a twin triode especially designed for use as a combined vertical deflection amplifier and vertical oscillator in television receivers
6BM8ECL82Triode pentode used as the driver and output stages in audio amplifiers, audio output and vertical output stages in televisions and has even been seen in an electronic nerve stimulator.
6BQ5EL84Beam-power pentode
6BQ6 GTBGEThe 6BQ6 is a power tube that greatly enhances the performance of audio amplifiers. It boasts a maximum plate power of 18 watts, with a high mu and low grid-plate capacitance that ensures exceptional musical characteristics.
6BQ7Dual Triode with internal shield
6BR7vacuum Pentode RF/IF-Stage
6BS4EC93Triode, vacuum UHF – Miniatur-7-Pin-Base B7G
6BW4 SYLFull-Wave Vacuum Rectifier – Noval, 9 pin miniature
6BX6EF90Sharp Cutoff R.F. Pentode (Used in Australian TV 39 MHz I.F. Strips and seen in Wien Bridge audio oscillator), E80F used in early computers.
6BX7 GTDual Triode 6BX7 vacuum tube in the straight-walled glass tube shape. belongs to a family of 3 medium mu double triodes along with the 6SN7 and 6BL7. They differ in amplification factor, transconductance and plate resistance.
6BY7EF85Remote Cutoff R.F. Pentode (Used in Australian TV 39 MHz I.F. Strips)
6BY8Diode-Pentode, Noval, 9 pin miniature (USA pico-9) B9A – Radio/TV-reception
6BZ7 SYLECC180Dual Triode. See 6BK7