By the other end, to build a hi-fi 2 x 50 w RMS amplifier with a distortion lower than 1 % over the full power range, you need 2 200 VA transformers, one 300VA transformer, 4 power tubes and 12 ...

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 ...

Power output is specified at 38 watts per channel when the amp is fitted with EL-34 power tubes, and 40 watts per with the optional KT-88 power tubes. The amp's rear panel hosts four sets of RCA ...

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 ...

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 ...

The SōLIS SO-7500 is an amplifier with vacuum tubes, in 2018. ... Vacuum tubes are very energy intensive, use a lot of power and are subject to noise (hum) when a tube is going bad.

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.

The MC275 tube amplifier Measures just 216 x 546 x 305 mm and is equipped with an output of 75 watts per channel at 2, 4, 8 or 16 ohms, or 150 watts in bridged mono mode, has a power band rating ...

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 50th Anniversary MC275 amp features four KT88/6650 power tubes, three 12AX7A inputs and phase inverters, and four 12AT7 voltage amplifier and drivers. 4 / 4.

The tube amplifier is a working prototype at the moment, ... a 230V, 50Hz IEC 60320 C14 power input with 630maT slow blowing fuse power protection, ...