Dev, the MA-3 has 42 power tubes in each channel. Since they are dual triode tubes, that's 84 tube sections.
The amp has built-in automated bias and DC Offset control (the tubes are directly-connected to the speaker outputs), built-in AC line regulation so even if your AC line drops to 100V it can still make full power. Most of the amps listed so far will be making a small fraction of their rated power if the AC line drops which it will in the presence of a large power amplifier!
Since there are so many tubes, several considerations are made to make it easy to live with. A tube tester is built-in and can be operated on-the-fly. The tubes are also bank-switchable, so if you don't need all that power on a particular day, you can operate 1/3 or 2/3 of the power tubes instead, having the rest turned completely off.
Balanced or single-ended inputs are accepted and there are two speaker terminals. Separate meters allow you to monitor the AC line voltage, the output of the AC line regulator, the output power of the amplifier and the condition of the tubes.
The amplifier is hand-wired, I suspect one of the very few in the 'list' so far where that is the case. There is only one stage of gain in the amp, giving it the simplest signal path of any high-powered amplifier. Since it is Output TransformerLess, it is also very fast which belies its high power output- the amp is sonically very nimble. All the wire, all the resistors and the coupling caps are custom-built. The power supply stores about 1/4 of a Farad per channel.
The amp has built-in automated bias and DC Offset control (the tubes are directly-connected to the speaker outputs), built-in AC line regulation so even if your AC line drops to 100V it can still make full power. Most of the amps listed so far will be making a small fraction of their rated power if the AC line drops which it will in the presence of a large power amplifier!
Since there are so many tubes, several considerations are made to make it easy to live with. A tube tester is built-in and can be operated on-the-fly. The tubes are also bank-switchable, so if you don't need all that power on a particular day, you can operate 1/3 or 2/3 of the power tubes instead, having the rest turned completely off.
Balanced or single-ended inputs are accepted and there are two speaker terminals. Separate meters allow you to monitor the AC line voltage, the output of the AC line regulator, the output power of the amplifier and the condition of the tubes.
The amplifier is hand-wired, I suspect one of the very few in the 'list' so far where that is the case. There is only one stage of gain in the amp, giving it the simplest signal path of any high-powered amplifier. Since it is Output TransformerLess, it is also very fast which belies its high power output- the amp is sonically very nimble. All the wire, all the resistors and the coupling caps are custom-built. The power supply stores about 1/4 of a Farad per channel.