A Dozen Tubes Make An Educational Amplifier

If you asked [Hans_Daniel] what he learned by building a tube audio amplifier with a dozen tubes that he found, the answer might just be, “don’t wind your own transformers.” We were impressed, though, that he went from not knowing much about tubes to a good looking amplifier build. We also like the name — NASS II-12 which apparently stands for “not a single semiconductor.”

Even the chassis looked really good. We didn’t know textolite was still a thing, but apparently, the retro laminate is still around somewhere. It looks like a high-end audio component and with the tubes proudly on display on the top, it should be a lot of fun to use.

Of course, there were issues to work out. You can read his story about his transformer problems and there is a ground problem generating some noise. The amp can deliver 15 watts without noticeable distortion, according to [Hans]. We were a little sad though that there wasn’t an audio clip or a YouTube video so we could hear for ourselves.

We’ve certainly seen quite a few tube amps over the years. If you want a 1963-vintage education on how they work, you only have to watch the Army video below that we covered some time back.

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