Lipo battery driven 3A5 vacuum tube headphone amp

Name: Lipo battery driven 3A5 vacuum tube headphone amp
SKU: 16895
Price: 80.00 USD
Availability: Discontinued
Rating: 4.50 (1 reviews)

(1 Review)

Vacuum tube stereo headphone amplifier with no need for an external power supply!

Designed by microwavemont in Japan

Product Retired

This product is no longer available for sale.

The seller may be offering an improved version or it may be hanging out on the beach, enjoying the retired life.

While you're here, check out these other awesome products for sale!

More "Hackaday" Related Products

Sale

FlippenHeimer -Geiger Counter for the Flipper Zero

Erwin Ried

$22.49 $44.99

Louder ESP32

Sonocotta

$24.00

USB-C for PS4 controller

Marius Heier

$10.00

USB4VC: USB Inputs on Retro Computers!

dekuNukem

$29.99

Lipo battery driven 3A5 vacuum tube headphone amp 1

Lipo battery driven 3A5 vacuum tube headphone amp 2

Lipo battery driven 3A5 vacuum tube headphone amp 3

Lipo battery driven 3A5 vacuum tube headphone amp 4

2019-05-05T13:39:29.120Z-IMG_3949 2..jpeg

On Dec. 15, 2025, my tindie store "micowavemont" trying restarting! Stay tuned!

Vacuum tube stereo headphone amplifier with no need for an external power supply!

What is it? Fully Lipo battery driven headphone amplifier. Input and output are simple 3.5 mm analogue audio. 1950's twin triode will bring you a wonderful vacuum tube experience. Why did you make it…

What is it?

Fully Lipo battery driven headphone amplifier. Input and output are simple 3.5 mm analogue audio. 1950's twin triode will bring you a wonderful vacuum tube experience.

Why did you make it?

I've made several things using Nutube and tubes. As for the audio amplifier, most of them are limited to USB DAC embedded version but a customer asked if I can make a more simple analogue I/O version. I quickly made a prototype of it and confirmed its wonderful performance! No way!

What makes it special?

Fully Lipo battery embedded. On board USB connector is connected to onboard Lipo battery charger. If the battery gets empty, you just need to connect USB cable to PC or AC/DC adaptor.
Lipo has just 3.7V but onboard voltage booster generate more 30V, which is well enough to drive 3A5, twin triode made in 1950's.
Single tube of twin triode 3A5 works as 2ch stereo headphone amplifier.
This item is fully assembled and checked (no kit version). Default is "with Lipo battery" but some countries will not accept parcel with Lipo (for example, Italy and Germany.. The prohibited country list is available only in Japanese at Japan post, so please confirm with me before ordering if you are not sure. If Lipo-prohibited country, please select "without Lipo" version for ordering and get Lipo battery cell from your local reseller.

Review Breakdown

Average Ratings

Product: (5.00)

Documentation: (4.00)

Shipping: (4.00)

Communication: (5.00)

Gregory | Aug. 16, 2019

Far exceeded my expectations

I ordered the Tube Headphone Amplifier because I've always heard there's a warmth to the sound output through tube amps. The price was reasonable and so I gave it a shot. Unfortunately my local post office couldn't find the package after trying to deliver it when I wasn't home because a signature was required. USPS shipped it back to Japan. Toshiro contacted me and he arranged to have it shipped again. Here I am about 6 weeks later and it was worth the wait! The sound is rich, warm and actually sounds like I'm in the room with the band. You'll hear subtleties of instruments that you didn't recall in the songs. I'm shocked at the difference. The quality is excellent and aesthetically pleasing. Get yours now!

With respect to Documentation - It's quite simple:
1. Carefully remove the tube from the box (be careful not to drop it as the tube is glass)
2. Insert it into the tube holder
3. Charge the battery - You'll need a USB Mini-B cable
4. Insert one cable in to the input jack
5. Insert your headphones or output line to the output jack
6. Turn on the power
7. Adjust the volume