OTOMON Laboratory　(音門ラボ) / 71A SE tube amplifier (pre amp) Walnut wooden board, Western Electric OPT, output 1W

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71A SE tube amplifier (pre amp) Walnut wooden board, Western Electric OPT, output 1W

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 !!!

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71A SE tube amplifier (pre amp) Walnut wooden board, Western Electric OPT, output 1W

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 Audio amplifier » Preamplifiers

71A tube preamplifier with drive tube is Western 717A. Output transformer is Western electric KS-8714. Dark vintage sound. 6DJ8, 6V6 was used as voltage regulator, rectifier is 80 tube. Input 230V.

This can be used as power amp as well as preamp, just change the switch to change from power mode to preamp mode. No NFB is adopted to prevent the fresh sound of 71A.

Input 230V, if you want to change to 117V or 100v, you need to pay for new power transformer.

Perfect amplifier with power tube 71A and drive tube 717A.
Voltage regulator

The wooden board is unique, it is walnut and I can not get the same, so it is impossible to order the quite same one. Walnut board is out of stock now.

Output is only 1W but it is really imazing sound. Sound is dark, rich , plenty of musical and beautiful.

I will include 717A tube, other tubes are not included.

Specification:

Hum level : 0.05mV
Total harmonic distortion: 5% 1W

Auto bias, you dont need to care any thing every time changing tube.

71A work standalone as power amp

71A work standalone as preamp