• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

best schematics for single ended & push-pull

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Joined 2001
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richt said:
push pull designs in

No quest for PP amps would be complete without looking at the PP-1C Power Amp
near the bottom of this page http://www.vacuumstate.com/schematics.htm .

This is the amp of Allen Wright's that Bernhard mentioned somewhere in another thread.

As far schematics go there are a LOT of them out on the www. I compiled a link list of solid state designs for my web-site, but for every amp on that list i bet there are at least 20, probably more, tube amps.

Go to <http://www.hwsams.com> and order a catalog. They sell service portfolios for most brands sold in the states. For instance you could order a copy of the Marantz 8B and get a schematic, photos, parts list and voltage and resistance readings. The library here in Dallas has most of the Sams Photofacts in the stacks and I can get them pulled and photo copy them. Lots of designs were really good only done on a large scale using cheap parts. There are lots of RCA, Magnavox etc SE designs worth making. Some of those old consoles had nice stuff in them but made with cheap caps and transformers. Good schematics though. Luck!
PP designs

The two best PP designs I have seen are,

The <a href="http://www.vacuumstate.com/images/PP-1C_a.gif">PP-1C</a> by Allen Wright (<a href="http://www.vacuumstate.com/images/PP-1C_b.gif">PSU here</a>),
the <a href="http://www.aloha-audio.com/triode1.html">Amity</a> by Lynn Olsen. However this is NOT a beginner's project. There is a lot of detail in a seemingly simple design.

Dunno much about SETs. I've yet to find one I like, but YMMV.


A friend of mine (Bob Danielak) made an amp using the "Sakuma principle" of transformer coupling and using the same tube for driver and final output.

He called it the "Sakuma Darling" and it used a step-up transformer at the input (4:1) into a 1626, interstage transformer coupled to a 1626.

We listened to several different 1626 amps together and in some ways this was my favorite, this approach clearly has a lot of merit.

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