A-2000 mk3

The front panel design of the A-2000 MK3 has changed significantly from its predecessor’s, and most importantly, the output tubes have changed from the KT150 to the KT170. The KT170 has a different shape and is larger than the KT150, and the KT170’s plate loss, which is used to measure the output, has increased from 70W to 85W. Normally, as a vacuum tube gets bigger, capacitance also increases and the accuracy of the high frequencies declines; however, the design of the KT170 overcomes this weakness, and its operation is very stable.

The 6S4 drive tube is also worth noting. In the original and 25th anniversary models, the E282F pentode was used in a triple connection, but in the SE and now in this new MK3 model, it has beenreplaced bythe6S4 triode. The 6S4 has an internal resistance of 3.7㏀, a voltage amplification factor (mu) of 16, and a current amplification factor (gm) of 4.5mA/V, making it ideal for use as a drive tube. In addition, its plate loss is high at 7.5W, so it has the advantage of being able to drive the KT170 output tube powerfully. After changing to the 6S4 triode, the amplifier became more stable and naturally musical sounding compared to the triple-connected pentode.

The A-2000 MK3 boasts many of Allnic’s signature features, including polycarbonate tube chimneys, output tube current meters, bias current adjustment potentiometers, and on-the-fly output tube mode conversion (pentode/triode) with a simple push-button. The slow-start mechanism that facilitates stable vacuum tube operationat power-on is also essential. The rear interfaces consist of 1 pair each of XLR and RCA input terminals and 1 pair of speaker cable connectors each for the left and right channels. There is also a toggle switch to select between 4Ω and 8Ω output impedance to assist with speaker matching.The A-2000 MK3’s input impedance is 100㏀, and its damping factor is 8, providing exceptionally powerful, articulate bass.