The power amplifier section also makes use of 2P29L tubes, which have similar characteristics as far as power draw is concerned. Normally, vacuum tubes rely on a resistive heater to eject ...

tubes, two ultralinear output transformers and one power transformer. Unlike its previous amplifiers, the Dynaco ST-70 was a ...

It’s a conventional tube amplifier circuit in which the triode is a preamplifier for the pentode power output stage. The pentode is running in class A mode, and the high impedance of its output ...

The McIntosh MC3500 MKII is a 350-watt power amplifier with eight EL509S high-power output vacuum tubes. It’s a single-channel amplifier that costs $15,000, meaning you’ll have to drop $30,000 ...

Last year, the company opened a manufacturing operation in Davis to make, test and cure its millimeter-wave power amplifiers.

Probably one of the most celebrated amplifiers ever made—the 33/303 two-box pre/power amp system from Quad—is back. The British high-end hi-fi brand is reviving the design 57 years after it ...