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We can provide power transformer which use for 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 !!!

YouTube channel > Otomon Lab YouTube Channel

Tube amplifiers


Total 421 Items.
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EXRARE 70s year Input transformer in NHK device, input transformer 1:3

Sales price: $ 285(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
Very very rare line CD tranformer、using in NHK device. Step up ratio is 1:3 . Wiring is Western Electric 70' year.
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[PROTOTYPE SALE] 101D(71A) drive 300B tube amplifier class A * 10W output

Sales price: $ 2,900(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
THIS IS PROTOTYPE SALE product. 300B tube amplifier with drive tube is 101D, prestage tube 396A. Input volt 100V, if you want to change to 117V or 230V let me know.
  • Limited edition

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

Sales price: $ 3,850(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
New old stock FULL set transformer for 211/845 tube OPT FW-150-10S, MS-UVD.
  • NEW

[SALE PRODUCT] VT-62/801 SE tube amplifier with 9W of output * ALL TANGO transformer

Sales price: $ 1,950(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
Original price if you order the same one is 2500USD. VT62/801A SE stereo tube amplifier. VT-62 is working in single end with output power is 9W. Perfect sound. Tubes are not included.
This product is currently sold out.
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[SALE] 71A PP tube amplifier class A * ALL transformer are TANGO * output 2.5W

Sales price: $ 1,500(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
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.
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45SE tube amplifier * Pure class A 2W with Western German OPT Sacksenwerk

Pure class A 45 tube amplifier using 417A(5842) tube as driver tube. Only 2W of output, no NFB adopted. Output is 40s year Western Germany Sachsenwerk.
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Passive preamp transformer finemet core attenuator 48 steps * Full balanced input and output

Special order made attenuator, transformer type with 48 steps, each step is -1.5 db. Sound is great, no signal lost, very musical. Transformer core is made from finemet meterial.
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Special order made 300B PSE tube amplifier monoblock 20W power

Special order made amplifier, working as para single end, power tube 300B, driver tube VT-62/CT-25A or 10Y. Output is 20W.
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101D drive 300B stereo tube amplifier class A1, no NFB 10W output

Sales price: $ 4,250(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
It is stereo SE amplifie using 300B tube as power tube. Driver tube is 101D. Pure class A1.
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10Y/VT-62 tube SE preamp, buffer amplifier

Special order made preamp, can be use both VT-62 and VT-25A, 10Y and 801A. No prestage tube was used, only VT62 to get pure sound of VT62.

[ORDER MADE] STC 4212 drive by PX4 tube amplifier mono block x 2

The power monster 4212 tube amplifier, drive tube is PX4, input tube is C3g(can be used with AC2). All transformer are special order made, orient cut core. Price for this pair is 15000USD.
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45 DAC tube amplifier using Philips TDA1541A on Wooden board

DAC decoder using Philips TDA1541A chip, output tube 45, using oil con, all best part ever.
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[ONLY ONE LIMITED] Balanced SE 45 tube amplifier * 5W with Western German OPT Sacksenwerk

Sales price: $ 2,000(Listing price is for payment via Paypal, discount 2% if payment via bank transfer)
Balanced SE 45 tube amplifier using 396A tube as driver tube. Output is 5W pure class A. Output transformer is 40s year Western Germany Sachsenwerk. Input transformer is 50s year Thordarson ones.
This product is currently sold out.
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  • Recommendation

417A-71A tube pre-amplifier, Walnut wood case, voltage regulator 6DJ8-6V6

71A tube preamplifier with drive tube is C3g. Output tube can be changed to VT-25, VT-52, 45, 50 tube. Luxury Wenger wooden case.
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101D drive 71A PSE stereo tube amp No NFB special order made

This is the best musical amp which has output under 2W that I have ever made. Using 71A tube, para single end amplifier. Driver tube is 101D, rectifier tube is 83. Regulator tube are 6V6. No NFB !
  • Recommendation

45/2A3 PP tube amplifier pure class A1 * Order made

2A3/45 tube amplifier . All transformers was put inside Wooden box. This is prototype version, all transformers are LUX. Amplifier has 3 blocks with separated power supply.