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In Reply to: RE: Can someone please identify this mechanism? posted by lukedileo2@gmail.com on November 08, 2016 at 18:18:48
An Actual Williamson amp. Not the design but the real thing.
Historically valuable as the Williamson design had vastly reduced distortion over the prior art, by using differential amplifiers (back in those days known as a 'long-tailed pair') as the driver. This reduced distortion as push-pull normally has some distortion cancellation in the load, now you were getting distortion cancellation driving the power tubes as well.
A venerable and very copied design!
Follow Ups:
But, the phase inverter is not a long tailed/differential type. Williamsons used the cathodyne phase splitter, aka: split load phase inverter. The Mullard and some McIntosh amps, as well as other vintage and historically important amps did use the long tailed pair arrangements. The split load inverter was one of the "features" of this long lasting Williamson design.
BTW, DTN Williamson was also the designer of the Ferranti ribbon phono cart pickup/tonearm in the mid-1950s. Why do I mention this, you all ask ? Because, that pickup was the first phono cart to offer an elliptical stylus. DTN Wmson was quite clever...
Actually we're both right on that. The Williamson amp uses both. The cathodyne drives the differential driver circuit.
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