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Total 9 documents matching your query.

1. [Amps] 8877 Grid Current (score: 1): Author: "Larry P. Greenberg" <wa9mag@ameritech.net>; Date: Tue, 18 Sep 2012 20:39:26 -0500; For a good number of years, I had a Henry 3K Classic export with a single 8877. Peak power (fully tuned) occurred when the grid current was low, around 10 to 20 MA. I recently picked up an Alpha 77DX; /archives//html/Amps/2012-09/msg00250.html (7,060 bytes)
2. Re: [Amps] 8877 Grid Current (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Wed, 19 Sep 2012 12:11:17 -0700; On 9/18/2012 6:39 PM, Larry P. Greenberg wrote: For a good number of years, I had a Henry 3K Classic export with a single 8877. Peak power (fully tuned) occurred when the grid current was low, around; /archives//html/Amps/2012-09/msg00253.html (7,548 bytes)
3. Re: [Amps] 8877 Grid Current (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 19 Sep 2012 16:13:36 -0400; The 77DX tube is likely getting soft (or will be) as 100 ma is considered the absolute safe maximum and at that point you are also likely well over the legal limit. Reduce the drive and grid current; /archives//html/Amps/2012-09/msg00254.html (8,659 bytes)
4. Re: [Amps] 8877 Grid Current (score: 1): Author: Dan Hearn <n5ardxcc@gmail.com>; Date: Wed, 19 Sep 2012 16:17:35 -0700; When I acquired my 77DX I also had a similar high grid current reading. W9AC , as I recall, told me that the grid meter circuit is designed to read 2X actual grid current. It was probably on AMPS ref; /archives//html/Amps/2012-09/msg00256.html (8,841 bytes)
5. Re: [Amps] 8877 Grid Current (score: 1): Author: donroden@hiwaay.net; Date: Wed, 19 Sep 2012 21:29:13 -0500; Metering errors ?? Don W4DNR The 77DX tube is likely getting soft (or will be) as 100 ma is considered the absolute safe maximum and at that point you are also likely well over the legal limit. Reduc; /archives//html/Amps/2012-09/msg00258.html (8,993 bytes)
6. [Amps] 8877 Grid Current (score: 1): Author: wosborne44@gmail.com; Date: Sat, 31 Oct 2015 13:20:46 +0000; Hi All, I have an Alpha 9500 with an interesting issue. The grid current slowly falls to near zero (less than 2-3 ma) with constant carrier input and constant output over a few minutes. The plate cur; /archives//html/Amps/2015-11/msg00003.html (7,205 bytes)
7. Re: [Amps] 8877 Grid Current (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 8 Nov 2015 19:21:47 -0500; As nothing else changes, I'd suspect a metering issue. Resistors, switch, or the meter? 73 Roger (K8RI) I have an Alpha 9500 with an interesting issue. The grid current slowly falls to near zero (les; /archives//html/Amps/2015-11/msg00029.html (8,019 bytes)
8. [Amps] 8877 Grid Current (score: 1): Author: Byron Tatum <bjtatum1@att.net>; Date: Thu, 27 Jan 2022 15:31:54 +0000 (UTC); Hello- I am commissioning a newly built 144 Mhz 8877 amplifier and am seeking advice on grid current. My tube is a known good, low hours Eimac YU-209. The amplifier is the W6PO design. I rebuilt a; /archives//html/Amps/2022-01/msg00103.html (9,165 bytes)
9. Re: [Amps] 8877 Grid Current (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 27 Jan 2022 16:23:38 +0000; Hi Byron, I have a homebrewed 2m W6PO amp built to the dimensions given in the original W6PO article. I run it with an HT of about 3700V under load. The grid current and efficiency is very dependent; /archives//html/Amps/2022-01/msg00105.html (10,855 bytes)

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