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1. [Amps] Removing grid shorts (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 11 Sep 2009 11:24:14 -0400; Ive salvaged several power tubes using 120VAC and a 200W light bulb in series as a current limiter. A bigger bulb would be better but I used what I have. Carl KM1H ___________________________________; /archives//html/Amps/2009-09/msg00152.html (9,008 bytes)
2. [Amps] Removing grid shorts (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 11 Sep 2009 18:31:32 +0000 (UTC); That makes sense. There doesn't appear to be any shorts between filament and grid or plate. It might also make sense to put a shorting bar on the filament pins as well as the grid. I suppose it; /archives//html/Amps/2009-09/msg00155.html (7,673 bytes)
3. [Amps] Removing grid shorts (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 11 Sep 2009 14:35:50 -0400; Ive salvaged several power tubes using 120VAC and a 200W light bulb in series as a current limiter. A bigger bulb would be better but I used what I have. Carl KM1H ___________________________________; /archives//html/Amps/2009-09/msg00156.html (6,399 bytes)
4. Re: [Amps] Removing grid shorts (score: 1): Author: K8MLM@aol.com; Date: Sat, 12 Sep 2009 08:38:03 EDT; Ive salvaged several power tubes using 120VAC and a 200W light bulb in series as a current limiter. A bigger bulb would be better but I used what I have. Carl KM1H ___________________________________; /archives//html/Amps/2009-09/msg00164.html (7,093 bytes)
5. [Amps] Removing grid shorts (score: 1): Author: "Doug Renwick" <ve5ra@sasktel.net>; Date: Fri, 24 May 2019 10:38:25 -0600; I have a GU-78B that has developed a grid short. I have determined the grid short initiates about 2 minutes after power on and ends after about 5 minutes. I have tried unsuccessfully to 'burn' the sh; /archives//html/Amps/2019-05/msg00065.html (6,999 bytes)
6. Re: [Amps] Removing grid shorts (score: 1): Author: Roman Ganovych <us5wdx@gmail.com>; Date: Tue, 28 May 2019 13:45:31 +0300; Hello Doug, you should talk to OM Power people to get the most comprehensive answer, based on their huge practical experience. They gave up long ago, and swithched to chinese FU-728F type, but still; /archives//html/Amps/2019-05/msg00070.html (9,764 bytes)
7. [Amps] Removing grid shorts (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 28 May 2019 09:46:01 -0700; <I have a GU-78B that has developed a grid short. I have determined the grid <short initiates about 2 minutes after power on and ends after about 5 <minutes. <I have tried unsuccessfully to 'burn' th; /archives//html/Amps/2019-05/msg00071.html (8,337 bytes)
8. Re: [Amps] Removing grid shorts (score: 1): Author: "Doug Renwick" <ve5ra@sasktel.net>; Date: Thu, 30 May 2019 19:27:49 -0600; Let's see if this e-mail goes through at Amps. It didn't go through at Ham_Amplifiers. Jim, I am not sure what to try next. Others have said not to use a 12v car battery for this tube. So I am at a p; /archives//html/Amps/2019-05/msg00076.html (9,093 bytes)
9. Re: [Amps] Removing grid shorts (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Fri, 31 May 2019 06:46:31 -0600; I am the "proud" owner of two Alpha 3CX800's with grid-cathode shorts that start 2 minutes into warm up. I would be thrilled if they cleared themselves after 6 minutes of warm up. 73, Steve, N2IC Jim; /archives//html/Amps/2019-06/msg00000.html (9,409 bytes)
10. Re: [Amps] Removing grid shorts (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sun, 02 Jun 2019 15:29:40 +0800; Yeah, my local club has a GU84B with the same condition. No short when she's cold but a couple of minutes into the warmup, the belly ache starts and stays. The tube is a display piece. Cheers, Alek.; /archives//html/Amps/2019-06/msg00006.html (11,471 bytes)
11. Re: [Amps] Removing grid shorts (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Thu, 13 Jun 2019 10:28:24 +0930; Hi Alek, Although I've not tried it, a less dramatic technique here might work: If the tungsten / molybdenum wire welded into a basket forming the 572B's grid structure is sufficiently ferromagnetic; /archives//html/Amps/2019-06/msg00036.html (11,174 bytes)
12. Re: [Amps] Removing grid shorts (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Fri, 14 Jun 2019 09:48:18 +0930; Hi Ron, I tried a magnet on some old 811A broken internal electrode parts including the grid basket and they stick to the magnet....so there might well be scope for correcting the electrode misalignm; /archives//html/Amps/2019-06/msg00038.html (10,333 bytes)

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