OTOMON Laboratory　(音門ラボ) / 2A3/45 drive 300B SE tube amplifier monoblock 10W power Zero NFB (O.U.D.D.C)

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2A3/45 drive 300B SE tube amplifier monoblock 10W power Zero NFB (O.U.D.D.C)

You can order input voltage 117V, 220V, 230V, 240V.

I dont open information about schematic, parts, transformer using in my amplifier. My brand name is the guarantee to what I do with my production !!!

For all item on eBay, I will discount 10% or more of listing price, contact for more detail.

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2A3/45 drive 300B SE tube amplifier monoblock 10W power Zero NFB (O.U.D.D.C)

THIS ITEM WAS SOLD OUT. If you want the same one, you can order me to get the same one.

Manufacturer:: OTOMON Lab

Audio amplifier » Tube amplifiers Audio amplifier » Special Order Made

Special order made amplifier, working single end, power tube 300B, driver tube is 2A3 or 45. No NFB, output is 10W. The new design with 2 layer structure is new research of us.

Input voltage can be changed to 117V or 230V. Original price for this amp if you saw that it was sold out is 3850USD plus shipping fee, tubes are not included. This amplifier is working in class A, SE mode. The plate current is about 65-70mA. Only in this first version, I include 2A3 and rectifier tubes as gift.

Power supply for prestage and driver stage is separated with output stage. This amp need 2 rectifier tube 5R4GW or 5U4 or 5AR4 v...v..

The new design with 2 layer structure inside amplifier chassis is the new research.

The part to part distance is shorter than usual.
The signal of audio is not affect by the hum, noise from power supply.

Primary is 417A, driver tube is 2A3 or 45, using O.U.D.D.C detail here > O.U.D.D.C (Otomon Ultimate Direct heat tube Driver Circuit) , the new approad

Specification:(No NFB)

Response frequency: 20Hz ~ 55KHz(-1db, + 0db)
Hum level: 0.3mV
THD: 5% 10W

Sound is great, The O.U.D.D.C make quite difference in low frequency, more beautiful than using interstage transformer. Wider open stage and more clear, more detail in mid and high range.