Audiophilepure

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“That’s quite the trick. We obtain 15—almost 17 watts—from a single-ended KT88 in class A1 but with a triode transfer function due to how the series-parallel connected six amplifiers operate. The taps in our transformers are different, the way they connect to the tubes is different. There is a screen tap which used to be called ultralinear and another winding for the cathode for a type of local feedback. A Stockham paper from the 50s showed how a triode can be modeled as a pentode with feedback by removing the grids. When you take the grids out of a pentode, you get inherent feedback between plate and cathode.”

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“The Munich show would be in May. This meant working overtime. At first we thought we could show final Swiss production units but that proved flatly unrealistic. By mid April however, we had built up our targeted five Brazilian pairs. My chassis fabricator was literally working night shifts and weekends to make it happen. Now it transpired that a very wealthy individual whom I know very well and who had sponsored this project from the very beginning had unexpected personal issues as things progressed. He had to pull out. Of course I understood perfectly. But now I was faced with how else to satisfy all the commitments I’d already undertaken. We quickly put our five pairs of amps in the car and visited audiophiles all over Brazil who were rich enough to afford anything in hifi that takes their fancy and who in general are deeply invested in and passionate about this hobby.”