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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+8877\s+Grid\s+Connection\s+DC\s+or\s+Not\s*$/: 14 ]

Total 14 documents matching your query.

1. [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Mon, 28 Nov 2016 21:00:21 -0600
Has anyone run the grid of an 8877 not connected to ground as far as DC is concerned? I really need to meter the grid current by bypassing the grid to ground with capacitors and several 10 ohm resist
/archives//html/Amps/2016-11/msg00155.html (6,717 bytes)

2. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: Bill Turner <dezrat@outlook.com>
Date: Tue, 29 Nov 2016 04:26:44 +0000
-- ORIGINAL MESSAGE --(may be snipped) REPLY: You might consider un-grounding the power supply if you can. It's not a safety issue - the difference between true ground and B- is a volt or two at most
/archives//html/Amps/2016-11/msg00156.html (7,646 bytes)

3. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Tue, 29 Nov 2016 17:35:54 +0000 (UTC)
Hi Jim, Why not leave the grid grounded but, just measure the cathode and plate currents then subtract to calculate the grid current? 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ Subject: [Amps]
/archives//html/Amps/2016-11/msg00160.html (8,340 bytes)

4. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Ian White" <gm3sek@ifwtech.co.uk>
Date: Tue, 29 Nov 2016 13:14:53 -0500
This reference, page 3 onwards, may explain what everyone means. http://www.ifwtech.co.uk/g3sek/boards/triode/triode-manual.pdf That is how it's done in the large majority of HF amplifiers, and in al
/archives//html/Amps/2016-11/msg00161.html (9,639 bytes)

5. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 29 Nov 2016 17:37:27 -0600
Marv... Because this will be a single power supply and multiple RF deck (5 or 6 of them) amplifier system for a contest station. I dont want to use vacuum relays as high voltage switches. Metering pl
/archives//html/Amps/2016-11/msg00164.html (9,180 bytes)

6. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 29 Nov 2016 18:38:57 -0600
Thanks Ian.. I'll add it to the several versions of your board info that I already have and use. I know how amplifier metering works. This is a special application. 73 Jim W7RY This reference, page 3
/archives//html/Amps/2016-11/msg00166.html (10,365 bytes)

7. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 29 Nov 2016 22:03:25 -0600
Because it solves nothing. All amplifiers will be running at the same time in a multi-multi contest environment. 73 Jim W7RY Hi W7RY: Marv... Because this will be a single power supply and multiple R
/archives//html/Amps/2016-11/msg00173.html (8,799 bytes)

8. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: Bill Turner <dezrat@outlook.com>
Date: Wed, 30 Nov 2016 05:42:04 +0000
-- ORIGINAL MESSAGE --(may be snipped) REPLY: That must be SOME power supply! 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
/archives//html/Amps/2016-11/msg00175.html (8,458 bytes)

9. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 30 Nov 2016 06:39:58 -0600
25 kva transformer. 73 Jim W7RY -- ORIGINAL MESSAGE --(may be snipped) Because it solves nothing. All amplifiers will be running at the same time in a multi-multi contest environment. 73 Jim W7RY REP
/archives//html/Amps/2016-11/msg00179.html (9,306 bytes)

10. [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 30 Nov 2016 06:20:50 -0800
Marv... Because this will be a single power supply and multiple RF deck (5 or 6 of them) amplifier system for a contest station. I dont want to use vacuum relays as high voltage switches. Metering pl
/archives//html/Amps/2016-11/msg00182.html (9,503 bytes)

11. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Wed, 30 Nov 2016 17:34:40 +0000 (UTC)
Hi Jim, Ah... the unknown factor. You could include an (optically?) isolated plate current sensor and then do the math and metering at low voltage. 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ S
/archives//html/Amps/2016-11/msg00189.html (10,591 bytes)

12. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Wed, 30 Nov 2016 17:15:30 -0500
I have used a non optical scheme at 9KV for a twt power supply. The hv is fed through a 100 ohm resistor, 100w in my case. The current through the resistor is about 500 mA so the voltage drop is 50v.
/archives//html/Amps/2016-11/msg00195.html (12,461 bytes)

13. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: RCM <robrk@nidhog.net>
Date: Wed, 30 Nov 2016 17:32:56 -0500
No need to meter Multi-Multi, one power supply. All the smoke will come out, one hour after start of contest. _______________________________________________ Amps mailing list Amps@contesting.com ht
/archives//html/Amps/2016-11/msg00196.html (8,111 bytes)

14. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Sat, 3 Dec 2016 19:48:12 +0000 (UTC)
Hi Jim, Just for ... fun, I drew up a possible approach to an isolated plate current sense. I didn't complete the receive side as this is just a concept for which I have no personal need. The attachm
/archives//html/Amps/2016-12/msg00033.html (8,368 bytes)

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