Tube Based Audio Amplifier Kits

There are a surprising array of tube amp kits on Ebay.

• Ebay: Tube Amp Kit
• Aliexpress: Douk audio amplifier

The audiophiles are nuts for tubes and kits have been created that combine silicon with vacuum tubes.  An example is shown in the following:

Nobsound MS-10D MKII Bluetooth Tube Integrated Amplifier HiFi Stereo Power Amp Home Audio USB Headphone 110~240V Black

Related Work

• Electronic tubes on Alibaba