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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: SE 6CB5 : @ 23 watts anode triode mode , LSES exp. update posted by deathtube 667 on December 7, 2016 at 19:48:55:
Something to consider: all rectifiers have a small amount of "dead time" during each AC cycle. When that occurs the input choke will produce a high voltage spike caused by its collapsing magnetic field. With repetition (120 times/sec.) this can breakdown the insulation in the choke and cause failure. Much of the literature from the "Golden Age" shows that designers applied snubbing circuits to the choke to control this phenomenon. M. Jones 4th ed. shows a variation of this usage. A small cap before the choke will help maintain voltage though the rectifiers "dead time" and prevent this.
In the old days of automotive Battery/Coil ignition systems when the points opened the collapsing magnetic field of the primary winding in the ign. coil would generate an inductive "kick" in the same manner and would quickly burn-up the points through arcing if not for the condenser. Back in the day I had a Honda motorcycle that had a penchant for trashing condensers. When the cap failed the points soon followed. A PITA when out on the highway touring.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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- RE: SE 6CB5 : @ 23 watts anode triode mode , LSES exp. update - JKT 12/8/1613:23:47 12/8/16 (0)
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