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1. [Amps] Arcing 8877 (score: 1): Author: "Les" <Listwa@comcast.net>; Date: Wed, 23 Nov 2011 16:21:46 -0500; Hi All, I have a 2nd hand 8877 based 144 Mhz amp, built like a rock. Has worked fine for over a year, then bang. I saw a flash and of course the fuse did its job. The tube in it was maybe 20 years ol; /archives//html/Amps/2011-11/msg00122.html (7,542 bytes)
2. Re: [Amps] Arcing 8877 (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Fri, 25 Nov 2011 01:32:23 +0000; Les, Is there anything in the tank circuit that could be breaking down? And do you have big diodes from B- to chassis at the power supply. My understanding is the purpose of them is to prevent damage; /archives//html/Amps/2011-11/msg00131.html (7,483 bytes)
3. Re: [Amps] Arcing 8877 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 24 Nov 2011 21:27:32 -0500; The tube is likely OK but the hardware needs a good examination and cleaning...all the way from the tube to the N connector and dont dismiss relays or coax. Is this being tested on a dummy load? Carl; /archives//html/Amps/2011-11/msg00132.html (8,936 bytes)
4. Re: [Amps] Arcing 8877 (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Fri, 25 Nov 2011 18:35:33 +0000; I had arcing a bit like that fixing a friend's W6PO 2m 8877 amp. It didn't have the big bang take out the fuses side but we could see arcing somewhere around the fins when the power was wound up. It; /archives//html/Amps/2011-11/msg00134.html (8,774 bytes)
5. [Amps] Arcing 8877 (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 25 Nov 2011 21:45:21 -0800; Hi All, I have a 2nd hand 8877 based 144 Mhz amp, built like a rock. Has worked fine for over a year, then bang. I saw a flash and of course the fuse did its job. The tube in it was maybe 20 years ol; /archives//html/Amps/2011-11/msg00141.html (8,804 bytes)
6. Re: [Amps] Arcing 8877 (score: 1): Author: TexasRF@aol.com; Date: Wed, 30 Nov 2011 21:01:27 -0500 (EST); Hi Les, I just went through the same experience with my 2m 8877 amplifier. The amp worked very well over the eme contest but did the big BOOM thing the next time I fired it up, only a couple of days; /archives//html/Amps/2011-12/msg00005.html (9,578 bytes)
7. Re: [Amps] Arcing 8877 (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 1 Dec 2011 13:40:39 +0900; hi Les, Jim and all I agree with Jim's answer. I am also using 50-ohm 100-watt resistor on HV+ line to avoid any failure of meters, tubes, diodes etc. It works fine - it will make a big explosion to; /archives//html/Amps/2011-12/msg00011.html (10,027 bytes)

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