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1. [Amps] 3cx800 flashover ? (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Wed, 21 Aug 2013 18:03:16 +0200; Hi, I need some advice of the group if this 3cx800 is beyond revitalization. Working on an old SSB electronics 70cm PA with a single 3cx800 in grounded grid configuration. Original bias/control circu; /archives//html/Amps/2013-08/msg00116.html (7,650 bytes)
2. Re: [Amps] 3cx800 flashover ? (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 21 Aug 2013 12:29:20 -0400; Try running filament only for at least 24 hours. Then run idle current for several hours at a safe level of no arcing.. Finally inject a little RF at a time and hope the tube has been regettered and; /archives//html/Amps/2013-08/msg00117.html (8,694 bytes)
3. Re: [Amps] 3cx800 flashover ? (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Wed, 21 Aug 2013 19:19:10 +0200; Tnx Peter/Carl/Bill, Tube is now on with heather/blower, let's see what happens next Friday .... 73's Carel, pc5m Try running it with filament volts only for 48 hours - apparently the getters on the; /archives//html/Amps/2013-08/msg00118.html (8,422 bytes)
4. Re: [Amps] 3cx800 flashover ? (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Sat, 24 Aug 2013 17:38:22 +0200; Hi, small report on my 3cx800 project... After more than 24hrs heather on (didnt dear to let it running unattended overnight...) first test did show indeed improved vacuum ! flashovers started at hig; /archives//html/Amps/2013-08/msg00123.html (9,893 bytes)
5. Re: [Amps] 3cx800 flashover ? (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 24 Aug 2013 12:13:26 -0400; Congratulations on the salvage work Carel. I suspect the negative grid current is due to the tube being run above its maximum rated frequency at HF voltages; I seem to remember Steve, K1FO (SK), ment; /archives//html/Amps/2013-08/msg00124.html (12,195 bytes)
6. Re: [Amps] 3cx800 flashover ? (score: 1): Author: TexasRF@aol.com; Date: Sat, 24 Aug 2013 12:58:29 -0400 (EDT); Carel, negative grid current is usually caused by lower than optimum drive power. My understanding of grid dissipation is volts times amperes; either polarity. 73, Gerald K5GW In a message dated 8/24; /archives//html/Amps/2013-08/msg00125.html (10,497 bytes)
7. Re: [Amps] 3cx800 flashover ? (score: 1): Author: Louis Parascondola <gudguyham@aol.com>; Date: Sat, 24 Aug 2013 14:50:31 -0400 (EDT); The negative grid current issue is covered in our 432 amp manual. I will have to consult it to see what Steve claimed was the cause. I remember reading it. Apparently it is only on higher frequency t; /archives//html/Amps/2013-08/msg00126.html (13,427 bytes)

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