The Titans of Tone: A Comparative Guide to 211, 845, 813, and 811 Vacuum Tubes
The Titans of Tone: A Comparative Guide to 211, 845, 813,...

In the world of high-fidelity audio, few components command as much reverence and mystique as large power tubes. Originally engineered for the demanding world of radio frequency (RF) transmission, tubes like the 211, 845, 813, and 811A have found a second life in the hearts of audiophiles. These "transmitting tubes" are prized for their linearity, power handling, and the unique sonic character they impart on music. They represent a departure from common audio tubes like the EL34 or KT88, operating at dangerously high voltages and requiring specialized amplifier designs.

This article delves into these four iconic tubes, comparing their origins, technical specifications, and sonic signatures. We will explore the classic rivalry between the 211 and 845 triodes, and contrast them with the rugged, high-power 813 beam tetrode and the high-gain 811A triode.

Read more
Video Demo: 2x25W 845 Vacuum Tube Amplifier 300B Drive 845 Single-end Class A 6SN7 Preamp Scaffolding
Video Demo: 2x25W 845 Vacuum Tube Amplifier 300B Drive 84...

The amplifier is adhering to the consistent concept, simple and atmospheric overall design, stable and nice sound optimized circuit to improve the performance of r this 845 amplifier. The direct thermal triode 845 amplifier can express the natural exquisiteness of vocal and string music, and it can also be calmly and magnificently when it is large dynamic. Even for those hard-to-push speakers, it can drive them well.

Read more