12AX7

The ECC83 is an electron tube (dual triode), which was designed primarily for low-frequency applications.

The ECC83 ( American name: 12AX7 ) was developed in 1948 by RCA. The composite tube has two independent and electrically identical triode systems in a glass flask.

Special, on the application oriented as audio amplifier characteristics are their low noise, low microphonics and the high internal resistance of 60 to 80 kOhm. The ECC83 is used as pre-and phase inverter in tube amplifiers. It is still produced in larger quantities.

Meaning of the term ECC83:

( Naming scheme see electron tube )

Specifications

The connection of the two filaments is drawn out, therefore, can be operated both Triodensysteme of either 150 mA with a filament voltage of 6.3 V at a heater current of 300 mA or a voltage of 12.6 V and a current.

Recommended static operating point ( per system ):

Different operating points can the performance curves.

Limits:

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Some newer versions like the variation of J / J shown above differ in the mechanical construction of the entirely original design: They are constructed with a span grid and visually similar, therefore, more of a E88CC/PCC88 or other VHF double triodes with this technique.

The visually similar to identical appearing types ECC82 ( 12AU7 ) and ECC83 ( 12AX7 ) can be distinguished by the often existing peephole in the anode in the backlight based on the mesh size of the grid: The ECC83 has a much narrower wound grid helix. This leads to a reduced penetration, a higher internal resistance, and at the same anode current in a higher slope.

Tetrodes and pentodes likewise have a high internal resistance and a high transconductance, but are less suitable because of the power distribution noise as a preamplifier.

The ECC808 is a variant of the ECC83 with less microphonic and hum sensitivity and other Sockelbeschaltung.

The E83CC is a variant of the ECC83 with long- life cathode ( between layer-free special cathode), it shows stronger flicker noise than the ECC83.

The ECC803S ( Telefunken ) and 6057 is the version of the ECC83 for professional use (long- life cathode and tighter tolerances ), it is executed in tension grid technique. However, this does not apply to the currently available ECC803S manufacturer J / J.

A Russian / Soviet version of the ECC83 is the 6Н2П ( latin 6N2P ), however, allows only 6.3 V heater and has a shroud between the systems.

Web Links / References

• Datasheets

• Electron tube