Carl: "There is an ample front to rear aluminum shield that is more than adequate to dissipate the 8W or so in normal use." All heat gets dissipated eventually. The question is: what is the junction
ORIGINAL MESSAGE: REPLY: If not overtemp, it's almost certainly arcing inside the tube. Even good tubes arc occasionally with no harm to the tube, but there can be harm to components in the HV- to HV
Thermal compound can be highly conductive if you buy the right kind. Hal Carl: "There is an ample front to rear aluminum shield that is more than adequate to dissipate the 8W or so in normal use."
Actually you *can* know something about the arc. 1. The peak current. The main function of a surge limiting resistor in the B+ line is to limit the peak current to a known value, so that Ipk = Vb/R.
Good info Ian. I was looking around trying to learn more about the various bias circuits in use. maybe people can provide historical views on some things I was curious about: -This 1971 Eimac paper o
My comment was directed to using a 50W zener. Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Hi Kevin, Bob, W6PO, spent many years in the development lab at Eimac/Varian and we enjoy the benefits of his work even today. No doubt he learned early on about zener bias and failures; hence the us
with 10 w zeners back in the 70's is..they are the 1st component to short out come glitch time. The problem with both a 10 w and a 50 w zener's is they won't handle a surge worth a damn. If you use a
Jim, in using the string of diodes for bias, do you notice any drift in the idle current as they warm up? Purchased in quantity these big diodes are way less expensive than a big zener diode and woul
ORIGINAL MESSAGE: REPLY: Excellent article. Thanks, Ian 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
ORIGINAL MESSAGE: REPLY: Not really, especially in the circuits we are talking about. The reason for using a 50 watt unit is for surge resistance, not continuous heat dissipation. A major surge is ov