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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.

YouTube channel > Otomon Lab YouTube Channel

Tube amplifiers


Total 477 Items.
  • NEW
  • Recommendation
  • Limited edition

45/2A3 PSE tube amplifier with driver tube 71A Walnut wooden case ZERO NFB

Sales price: $ 3,200(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
【PROTOTYPE SALE】This is 45PSE tube amp (can be used with 2A3), special order made with driver tube 71A and Walnut wooden case. It is one of the best 45/2A3 PSE tube amp I have made.
  • NEW

WE396A MM, phono preamp with power supply separated

Special order made phono stage preamplifier. Using We396A for phono stage and line stage used 396A tube, output transformer was used.
  • NEW
  • Recommendation

71A/101D drive VT-62 SE tube amplifier 7W power Zero NFB (O.U.D.D.C)

This is VT-62 tube amp that adopted circuit O.U.D.D.C, and it is exactly the best VT-62 tube amp that I made.
  • NEW
  • Recommendation

71A/101D drive VT-62 SE tube amplifier 7W power Zero NFB (O.U.D.D.C)

This is VT-62 tube amp that adopted circuit O.U.D.D.C, and it is exactly the best VT-62 tube amp that I made.
  • Recommendation
  • Limited edition

Luxman SQ-38FD (Otomon LAB overhaul) 71A PP tube amplifier class A1

Sales price: $ 1,400(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
Luxman SQ-38FD (Otomon LAB overhaul) 45 PP tube amplifier class A1. Output stage changed to 71A tube. Intergrated tube amp with phono stage, tone control.
  • NEW
  • Recommendation

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

Sales price: $ 2,900(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
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.
  • NEW

WE396A MM, phono preamp with power supply 300B regulator

Special order made phono stage preamplifier. Using We396A for phono stage with power supply is regulated by 300B and 6DJ8 tube. Line stage used 417A tube.
  • NEW

300B SE power amplifier 7~16W can be used as headphone amp and preamp Zero NFB

300B SE stereo tube amplifier power amplifier with 7W of power at 8ohm and 15W at 16ohm. Can be used as preamp as well as headphone amplifier. Zero NFB !!!
This product is currently sold out.
  • NEW
  • Recommendation

45 PSE tube amplifier with driver tube 2A3/45 (O.U.D.D.C ) output 6W

This is 45PSE tube amp, special order made with driver tube 2A3 and Walnut woonden case with top copper plate 3mm thick. You can use drive tube either 2A3 or 45 without any modification.
  • NEW
  • Recommendation

2A3 SE tube amplifier amp pure class A Zero NFB 3.5W output

2A3 tube amplifier of new design, using C3g as driver tube.
  • Limited edition

New old stock pair Hirata TANGO OPT FW-150-10Sr, MS-UVD

Sales price: $ 2,650(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
New old stock OPT transformer for 211/845/GM70 tube OPT FW-150-10S
  • NEW

211 SE tube amplifier drive tube 2A3, class A1 stereo 18W output (O.U.D.D.C) Zero NFB

It is special order made SE amplifie using 211 tube as power tube. Stereo spec, output is 18~20W per channel. Driver tube is 2A3 or 45, using O.U.D.D.C in driving power tube. This amp weight is 50kg.
  • NEW

300B SE headphone amplifier made for planar magnetic Zero NFB

300B SE stereo tube amplifier using for headphone. Customer ordered made for planar magnetic headphone and another headphone with low impedance. Zero NFB !!!
  • NEW

GM70 SE tube amplifier drive tube 2A3, class A1 stereo 28W output (O.U.D.D.C) Zero NFB

It is special order made SE amplifie using GM70 tube as power tube. Output is 28~30W. Driver tube is 2A3, using O.U.D.D.C in driving power tube.
  • NEW
  • Recommendation

Prototype 71A/101D drive VT-62 SE tube amplifier 7W power Zero NFB (O.U.D.D.C)

This is prototype product that was made for trying the new circuit O.U.D.D.C, and the result is really amazing.
This product is currently sold out.
  • Limited edition

USED FULL set transformer for 211/845 tube Hirata TANGO OPT FW-150-10Sr, MS-UVD

ULL set transformer for 211/845/GM70 tube OPT FW-150-10S, MS-UVD.
This product is currently sold out.