OTOMON Laboratory　(音門ラボ) / THE Zeus 833A Mk2 tube amplifier monoblock x 2 * 300B drive * 50W

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THE Zeus 833A Mk2 tube amplifier monoblock x 2 * 300B drive * 50W

We can provide power transformer which use for 117V, 220V, 230V, 240V.
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THE Zeus 833A Mk2 tube amplifier monoblock x 2 * 300B drive * 50W

This product is not for sale, if you want the same item, please contact me for special order making

Manufacturer:: OTOMON Lab

Audio amplifier > Tube amplifiers Audio amplifier > Special Order Made

This is upgrade version from The Zeus 833A that using 211 tube as drive tube. Drive tube change to 300B, to make sound more musical and clear in middle range.

The reason that I change drive tube to 300B is using 211 drive 833A make sound full of power but lack the musical and a little dry in middle range and high mid range. Changing drive tube to 300B make sound more clear in middle range and the most important thing is make sound more musical, sweeter and detail.12Y7 is adopted as prestage because it is best matching with 300B.

All 833A is very huge tube, originally it was used in transmission part of Russia tank. It also was used in America radio broadcast. This amplifier is working in class A2, positive volt bias in grid. Grid bias is about approximated 0V, plate current is about 130mA.

The most diffucult thing in design this tube amp is the heat from 100W filament of 833 tube is terrible, it effect to another tube and cause the noise in high frequency.

Specification:
Response frequency: 10Hz ~ 100KHz -1db
Hum Level :0.7mV
THD: 1% 1W
Output transformer is special order made from ISO (TANGO), primary allow current 250mA.

Sound is very rich, open wide range and detail with high speed and very hot vocal.

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