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Erik, the kind patron who commissioned the amp, will weigh in with his impression of its performance later in this report. But the amp shown in the DIY series – using all-new Hammond “iron” – bested the prototype. I’d been moderately impressed with the sound of the prototype, using transformers reclaimed from a five or six decades-old Heathkit.

What you see above is the prototype EL84 Simple Push Pull (SPP) amplifier from my six-part DIY series published in 2020. A lot of YouTube rabbit holes gone down too, more on that later. Two years and counting of near-isolation in a global pandemic can do that. (to varying degrees) By Steve Grahamīored? Take an OK amp, buy two new transformers

Hopefully one of the experienced builders here with proof what I've written and correct me if I am wrong.īest Wishes and Good Luck with the build.Do Transformers Matter? Spoiler Alert, They Do. Getting the wiring correct, with respect to the layout and schematic is essential. Probably both of the 120v primary wires on the PT are black. NO other ground wires of any type should be connected there! That connection should be a short stout wire gauge securely fastened (bolt, very tight) to the chassis near the power socket. On the power socket, the "E" (green wire on the layout) is Earth Ground. Notice where the other side of the MOV (mentioned above) connects to the front panel power switch? That's where the other 120v primary wire of the PT goes. That gets connected from the power socket to the power switch at the point labeled C2 on the layout (again, use color coded wire to keep things organized).

that's the switch lug (left side of switch) the hot side of the PT 120v primary goes to.īack to the layout, the "N" on the power socket is the neutral line (0 volts). See the MOV (metal oxide varistor) on the layout. From the power socket, the live wire goes to the fuse (I suggest using color coded wire here to help keep things properly identified), and then to the front panel power switch (labeled C1 on layout).įrom the power switch the live connection goes to the power transformer primary (120 volt side of HTS-5199 diagram). On your layout, the hot wire from the wall power is labeled L (in red on the layout).