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We can provide special order made ISO (TANGO) power transformer which use for 117V, 220V, 230V,240.You dont need to use step down transformer as using my amplifier

From now we can provide amplifier with wooden chassis based on order of customer. Please contact for more detail !!!

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Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

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 prototype 833A tube amplifier using 211 driving tube. I made for my system and it is not for sale. Due to lack of heater transformer,it can not be ordered to made the same one now.

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, 211 tube is used as drive tube. I used 2 output transformer Tango XE-20S for interstage, grid bias is from 4~8 V, plate current is 150mA.

Heater for 833A is 10V at 10A, it needs 100W transformer, almost case people use switching transformer for heater purpose but in this case 2 big transformer of SANGAMO was used for better result . Power transformer is TANGO 's biggest one MS-450D.

Output transformer is special order made from Hirata TANGO, primary allow current 250mA.

Prestage is EF37 or 6J7GT, 6SN7 was used to regulate electric volt for
EF-37

Output is about 60W, noise is about 2mV.

Sound is very powerful, wide range and detail with high speed and sexy vocal.
Click to the image to view it in big size and please read our busines term before making your decision

More detail pictures:

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W

Prototype 833A tube amplifier monoblock x 2 * 211 drive * 60W