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1. [Amps] Alpha 8100/GU74B Tetrode question (score: 1): Author: Gary K9GS <garyk9gs@wi.rr.com>; Date: Sun, 13 May 2012 14:10:04 -0500; Hello all, I have an Alpha 8100 with a pair of GU74B/4CX-800 Tetrodes. I recently had a problem occur with the amp going into a fault condition as soon as any drive was applied. Through some help fro; /archives//html/Amps/2012-05/msg00278.html (7,151 bytes)
2. Re: [Amps] Alpha 8100/GU74B Tetrode question (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Mon, 14 May 2012 11:23:31 +0930; Hi Gary, The GU74B tube has a rated maximum screen dissipation of 15W, and a typical operating screen current of circa 20 to 30 mA @ 350 Volts, equating to less than 10 Watts. Under normal amplifier; /archives//html/Amps/2012-05/msg00279.html (8,983 bytes)
3. Re: [Amps] Alpha 8100/GU74B Tetrode question (score: 1): Author: Gary K9GS <garyk9gs@wi.rr.com>; Date: Sun, 13 May 2012 22:38:35 -0500; Hello Leigh, I did the same calculation that you did and reached the same conclusions. I don't have the amp up and running yet as I didn't have a replacement part. I'm hoping I have something suitabl; /archives//html/Amps/2012-05/msg00280.html (10,027 bytes)
4. Re: [Amps] Alpha 8100/GU74B Tetrode question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 14 May 2012 10:42:56 -0400; That is there as both a parasitic damper and a fuse in case of a screen short. Likely problem is a blown tube due to a tuning or antenna fault. OTOH you may be lucky. Carl KM1H ______________________; /archives//html/Amps/2012-05/msg00281.html (9,040 bytes)
5. Re: [Amps] Alpha 8100/GU74B Tetrode question (score: 1): Author: Gary K9GS <garyk9gs@wi.rr.com>; Date: Sat, 26 May 2012 17:06:20 -0500; Finally had some time today after Dayton and getting caught up with other stuff. I replaced the series screen resistor and the amp looks like it's working normally. I need to do some additional check; /archives//html/Amps/2012-05/msg00343.html (10,274 bytes)

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