Thank you, Gary! Now I know where I can buy a spare plate choke bypass capacitor for my homebrew dual-833C linear amp. :-)
73, Mike www.w0btu.com On Fri, Dec 28, 2018 at 4:10 PM Gary K9GS <garyk...@wi.rr.com> wrote: > Hi Dave, > Take a look here: > https://www.alpharfsystems.com/?s=75+pF&submit=Search > They have both the individual caps, now 18 kV, and the 5 capacitor > assembly. > Good luck > > > > > > > 73, > Gary K9GS > -------- Original message --------From: daraym...@iowatelecom.net Date: > 12/28/18 3:16 PM (GMT-06:00) To: topband@contesting.com Subject: > Topband: Need for capacitor > Greetings topbanders. . . > > While CQing early this morning I began noticing a faint but troubling > smell in the shack. It smelled like over heated wiring or electrical > components. It continued to get stronger as I realized the odor was coming > from the Alpha 99 amp. Indeed, a few moments later it tripped out. I dug > into it this afternoon and discovered a leaky 75 pF/6 kV cap which is one > of five such caps in a parallel bank that is pulled in on the band switch > to achieve tank resonance only on 160m. I have removed the bad cap making > the amp operational once again with the air variable tuning cap making up > the lost C (and there’s still a little C to spare on the air-variable). > After some searching I cannot find a 75 pF/6 kV cap. Mouser does not have > anything even close in terms of the high voltage rating (hopefully I didn’t > something). The closet thing Newark has is 47 pF which I have ordered. > I’m guessing the 47 pF is probably OK but how important is equal current > distribution across the five caps? Maybe I don’t need to be concerned > about it? If I really do need the correct 75 pF/6 kV cap does anyone have > ideas of a source? Replying privately is fine. See you all in the > Stew. 73. . .Dave, W0FLS > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector