It is a 12 watt valve amplifier with two inbuilt speakers and two inputs, one for the keyboard and one for a record player.
12.
It's also notable that almost all recent audiophile valve amplifiers make a deliberate display of their valves and place them visibly on show.
13.
Because of the invention of valve amplifiers, the production of simple moving coil mics like the Western designed 630A 8 Ball became possible.
14.
Valve amplifiers produced since that time usually use one of these tubes, which have remained in continuous production ( apart from KT66 ) ever since.
15.
The driver stage for class AB2 and B valve amplifiers must be capable of supplying some signal current to the power valve grids ( " driving power " ).
16.
Despite being largely unknown in the U . S ., Selmer guitar amplifiers from the early 1960s have begun to gain a reputation as vintage collectibles among valve amplifier enthusiasts.
17.
Some valve amplifiers use the single-ended triode ( SET ) topology that uses the gain device in class A . SETs are extremely simple and have low parts count.
18.
For some years following the introduction of solid state amplifiers, their perceived sound did not have the excellent audio quality of the best valve amplifiers ( see valve audio amplifier ).
19.
Most commercial valve amplifiers operate in Class AB1 ( typically pentodes in the ultra-linear configuration ), trading open-loop linearity against higher power; some run in pure class A.
20.
While semiconductor amplifiers have largely displaced valve amplifiers for low power applications, valve amplifiers can be much more cost effective in high power applications such as radar, countermeasures equipment, and communications equipment.
