Triode

At fields around this point, the device operates similar to a triode.

Beam power tubes can be connected as triodes for improved audio tonal quality but in triode mode deliver significantly reduced power output.

Construction Structure of a modern low-power triode vacuum tube.

For example, the ECC83 (equivalent to the 12AX7) is a 6.3V (E) double triode (CC) with a miniature base (8).

From here, a circuit designer can choose the operating point of the particular triode.

He would later go on to help refine the triode vacuum tube.

However, more recently the triode and other vacuum tube devices have been experiencing a resurgence and comeback in high fidelity audio and musical equipment.

In a triode this so-called secondary emission of electrons is not important since they are simply re-captured by the more positive anode (plate).

In early designs, dozens (in some cases over 100) low-gain triode stages had to be connected in cascade to make workable equipment, which drew enormous amounts of power in operation and required a team of maintenance engineers.

In the class-A triode amplifier, an anode resistor would be connected between the anode and the positive voltage source.

In triode datasheets, characteristics linking the anode current(I a ) to anode voltage (V a ) and grid voltage (V g ) are usually given.

Its input stage used a long-tailed triode pair with loads matched to reduce drift in the output and, far more importantly, it was the first op-amp design to have two inputs (one inverting, the other non-inverting).

Langmuir was one of the first scientists to realize that a harder vacuum would improve the amplifying behaviour of the triode, having improved Gaede's diffusion vacuum pump.

Like other MOSFETs, nMOS transistors have four modes of operation: cut-off (or subthreshold), triode, saturation (sometimes called active), and velocity saturation.

Like vacuum tubes, it contains a hot cathode and an anode, but also a control electrode which behaves somewhat like the grid of a triode.

Of note, in the 1960s, the 6BK11 Triple Triode Compactron tube was used by the Ampeg amplifier company in some of their guitar amps.

One of the first vacuum tube AM radio transmitters, built by Meissner in 1913 with an early triode tube by Robert von Lieben.

RCA 6DS4 "Nuvistor" triode vacuum tube, ca. 20 mm high and 11 mm in diameter.

RCA manufactured an AM broadcast transmitter employing a single class-C low mu triode with an RF efficiency in the 90% range.

Specialized types of triode ("lighthouse" tubes, with low capacitance between elements) provide useful gain at microwave frequencies.