Over the next two years they developed their first valve amplifier.

The sound system was initially driven by a Kalee model 522 valve amplifier.

This describes how loudly the "physical" equivalent of the virtual valve amplifier is set.

(RF is outside the scope of this article, see valve amplifier).

Amateurs also use valve amplifiers in the 500-1500 watt range mainly for economic reasons.

The grid leak detector stage is a non-linear valve amplifier.

Radford valve amplifiers are rare today, and still command high prices on the secondhand market.

The simplicity of valve amplifiers, especially single-ended designs, makes them viable for home construction.

Valve amplifier circuits are significantly different from broadband solid state circuits.

For high-end audio, where cost is not the primary consideration, valve amplifiers have remained popular and indeed during the 1990s made a commercial resurgence.

This makes them unsuitable for use with valve amplifiers, particularly lower-power single-ended designs.

In addition to a range of commodity valve amplifiers, some amplifiers were made which are still highly regarded today.

Early valve amplifiers used unregulated power supplies.

Broadband valve amplifiers typically use class A1 or AB1.

Cipollina had a unique guitar sound, mixing solid state and valve amplifiers as early as 1965.

Valve amplifiers were critical in development of long-distance telephone circuits and submarine telephone cables.

Valve amplifiers have a "warmer" tone than those of transistor amps, particularly when overdriven.

It's also notable that almost all recent audiophile valve amplifiers make a deliberate display of their valves and place them visibly on show.

Valve amplifiers produced since that time usually use one of these tubes, which have remained in continuous production (apart from KT66) ever since.

They are both played through a Fender Blues DeVille valve amplifier.

Output transformers dramatically increase the cost of a valve amplifier circuit compared to a direct-coupled transistor alternative.

Semiconductor amplifiers have overwhelmingly displaced valve amplifiers for low and medium power applications at all frequencies.

Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s.

Output transformer: Transformer used to match the output of a valve amplifier to its load.

By 1931 a valve amplifier and thyratron-based automatic counting system were in regular use in the Cavendish Laboratory.