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1. [Amps] AL-82 Zener problems (score: 1): Author: Joe Musto <joe@jtme.com>; Date: Mon, 28 May 2007 14:43:15 -0400; I have an AL-82 that periodically blows the zener diodes in the biasing circuit. When it happens, I hear a pop, after which the plate current increases and the tubes run hot. I generally operate on t; /archives//html/Amps/2007-05/msg00235.html (7,047 bytes)
2. Re: [Amps] AL-82 Zener problems (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 28 May 2007 18:06:20 -0400; It's a tube Joe. It can't be anything but a tube, and what you see is typical of a marginal vacuum in a tube. Once the tube "pops" it probably getters itself (arcs can clear the gas) just enough to; /archives//html/Amps/2007-05/msg00237.html (7,139 bytes)
3. Re: [Amps] AL-82 Zener problems (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Mon, 28 May 2007 21:51:18 -0400; Hello Joe: The Zener diode doesn't handle spikes very well, even a small current spike can easily destroy your bias supply. Since you seem to return to normal operation after replacing the diode, it; /archives//html/Amps/2007-05/msg00239.html (10,112 bytes)

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