All wires were connected back up to the board. Another 20 minutes or so with a Dremel tool and I was ready to start reassembly.Īdapter plates and their new output transformers were bolted down and the circuit board reinstalled. It turned out I had to remove the amp circuit board but that only took about 10 minutes. A trip to buddy Dan’s tool shop and couple of hours thrashing about on his knockoff Taiwanese Bridgeport milling machine, and it was trannie swap time. A root through my scrap metal bits and pieces yielded some usable 1/8” aluminum plate. ![]() ![]() Swapping output transformers would be a piece of cake electrically but more of a challenge mechanically. So, the plan was to try and capture some of the magic Erik’s amp possessed compared to the slightly muzzy sound of my prototype. 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 ![]() Do Transformers Matter? Spoiler Alert, They Do.
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