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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 535 Items.
  • NEW
  • Recommendation

71A drive 2A3 SE tube amplifier 5W power Zero NFB (O.U.D.D.C)

This is 2A3 tube amp that adopted circuit O.U.D.D.C, and it is exactly the best 2A3 SE tube amp that I made.

300B/PX4 compatible SE stereo tube amplifier class A1

It is stereo SE amplifie using both 300B/PX-4 tube as power tube. Output is 10W with 300B. Power tube can be changed 300B to PX4 without any modification, just plug and play.
  • Recommendation

811A/100th SE tube amplifier 717A-EL-34 driver tube max 15W

This amplifier used both 811A and 100th as output power tube. You can change between 2 tubes by switch. Prestage tube is 717A, driver tube is EL-34.Output power is 15W/channel with 811A tubes

CD->RIAA converter, let your CD sound become LP sound, TAMURA OPT transformer

Sales price: $ 400(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
This used Tamura output transformer to convert CD signal as well as digital resource as iPhone, iPad sound to RIAA standard curve. Just connect RIAA out to MM phono stage and let it play as LP
  • NEW
  • Recommendation

300B PP tube amplifier pure class A1 monoblock * driver tube 71A * Zero NFB 30W (O.U.D.D.C)

300B tube amplifier. Driver tube 71A x 2. This adopted O.U.D.D.C and absolutely the best 300B push pull amp that I have ever made. It has output 25-30W per channel, impossible with 300B PP amp.
  • NEW
  • Recommendation

71A PP tube amplifier class A * ALL transformer are old TANGO * output 2.5W

71A tube amplifier with drive tube is 396A and 6DJ8. Input volt 100V, if you want to change to 117V or 230V let me know.
This product is currently sold out.
  • Recommendation

2A3/45/71A compatible SE tube amplifier pure class A1 monoblockx2, driver tube 717A

2A3/45/71A compatible SE tube amplifier. 3 type of tubes can be used with this amp. This is monoblock amplifier x 2. All transformer are vintage Sansui
This product is currently sold out.
  • NEW
  • Recommendation

300B SE stereo tube amplifier with 10W output/channel class A1 No NFB

300B SE stereo tube amplifier with 10W output/channel class A1 No NFB. Price for this amp if you see it sold out is 2200USD plus shipping fee. Tubes are not included.
  • Recommendation

2A3/45/71A compatible SE tube amplifier pure class A1 All driver tube are DHT tubes (O.U.D.D.C)

2A3/45/71A compatible SE tube amplifier. 3 type of tubes can be used with this amp. This is dual monoblock amplifier. Sound is very beautiful, sweet and analog.
This product is currently sold out.
  • Recommendation
  • Limited edition

45/71A PP tube amplifier class A1 with early ALL LUXMAN transformers

45/71A compatible tube amplifier, working in class A1 push pull. All transformers are Luxman, output impedance is 4,8,16 ohm
  • NEW

C3m/300B stereo tube amplifier class A1, 8W output

It is stereo SE amplifie using 300B tube as power tube. Output is 8W. Walnut wooden case with top class parts. Driver tube is C3m. No NFB specification.
  • Recommendation

EL-84 PP tube amplifier amp 4 blocks * Output 11W

EL-84 PP tube amplifier, output power is 11W. Price for this amplifier is 1250USD. Tubes are not included.
  • NEW

845 SE tube amplifier class A, zero NFB EF-37/6SN7 18W/channel output

It is SE amplifie using 845 tube as power tube. Output is 18W/channel. Prestage tube is 717A, driver tube 6SN7. High voltage version 1000V , fixed bias.
  • NEW
  • Recommendation

Passive preamp transformer finemet core input transformer with attenuator

Sales price: $ 800(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
Passive preamp transformer finemet core input transformer with attenuator. Attenuator is 12 step attenuator. You can choose bypass attenuator to use transformer directly.
  • Recommendation

2A3/300B SE tube amplifier mono block pure class A1, No NFB, driver tube is DHT tubes (O.U.D.D.C)

2A3/300B SE tube amplifier. Working in pure class A, driver tube is 71A. No NFB, output 9W for 300B and 4.5W for 2A3.
This product is currently sold out.
  • NEW
  • Recommendation

71A/45/2A3 compactible PP tube amplifier class A * No NFB

71A/45/2A3 compactible PP tube amplifier class A * No NFB. You can use 3 type of tube on this amplifier. Pure class A, no NFB.