The pentode is controlled with the pre-amplified signal and acts as a power amplifier. [Marcel]’s amplifier also uses a PY88 tube rectifier instead of semiconductor diodes, making it an entirely ...

Rumor has it that a tube amps power goes a long way compared to a SS amp. How is 89o possible with, say a 12 wpc tube power amp compared with 150 wpc SS amp?

Figure 1 Hybrid tube/FET audio amp with active feedback. Since the op-amp output is at or near common potential, the vacuum tube pentode input stage is cathode-biased via R5 in the normal fashion. The ...

Dynaco liquidated in 1980 — primarily due to improvements in solid-state amplifiers and a 1974 FTC ruling that changed the standard way of rating amplifiers’ power levels. But the ST-70 has remained ...

IN THE AGE OFwireless speakers and Bluetooth streaming, vacuum-tube amplifiers may seem antiquated, but you don’t have to be an audio nerd to appreciate their appeal. Designed to power ...

Dynaco ST-70 Tube Power Amplifier (used prices range from $300 on up) Designed by David Hafler in 1959, the stereo 35-watt-per-channel tube amp is legendary for its sound quality.

Schiit Audio’s Valhalla 3 is a high-end tube headphone amplifier primed for the desktop. It borrows a lot of tech from the company’s larger Folkvangr ($1,799), including its OTL/OCL design, which has ...

The amplifier features dual ECC-82 tubes for the preamp phase and dual EL-84 pentodes for the power amp phase. This combination ensures a rich, warm sound that is characteristic of tube amplifiers.

Under the hood, a pair of 6CA7 power tubes give the Archon a response that sits somewhere between classic British and US tube amplifiers. Sometimes, amps sell themselves on that one thing they do ...