- DC bias on heater winding ? - 2 Updates
| Jeff Urban <jurb6006@gmail.com>: Jul 30 12:04AM -0700 I am aware of that. If they use a single triode for a splitter the cathode voltage should be what, a third ? In a hifi amp, if they got a full blown Williamson and I mean with the cathode taps they are going to need a hell of alot of voltage on it. I am not sure the old ECC83 an do it. Most full Williamsons with the cathode taps have another stage, sometimes with a bootstrap to get the drive they need. But that type of amp is rare. Mac made one or two, my Uncle built a pair of monoblocks using Chicago BO-15 transformers. The BO-14s do not have cathode taps. Those were actually popular transformers back then, but the BO-15 was really hard to get. Tubes, I tell you what, those amps my Uncle built sounded better than any tube amps I ever heard till then or since. |
| Phil Allison <pallison49@gmail.com>: Jul 30 02:04AM -0700 Jeff Urban wrote: ================== > I am aware of that. If they use a single triode for a splitter the cathode voltage should be what, a third ? In a hifi amp, if they got a full blown Williamson and I mean with the cathode taps they are going to need a hell of alot of voltage on it. I am not sure the old ECC83 an do it. Most full Williamsons with the cathode taps have another stage, sometimes with a bootstrap to get the drive they need. But that type of amp is rare. ** I have rarely seen a total red herring chased down a rabbit hole so thoroughly before. Quite something. ...... Phil |
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