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1. [Amps] Grid resonance (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 07:49:39 +0100; A had a few minutes before leaving the office yesterday, so I fired up the network analyser. I made some rough, not precision, measurements and, as these were done on a cold tube lying on the bench I; /archives//html/Amps/2005-04/msg00153.html (7,358 bytes)
2. Re: [Amps] Grid resonance (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 07:57:29 +0100; Sorry, should have said this was on a 8877. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-04/msg00154.html (7,503 bytes)
3. Re: [Amps] Grid resonance (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 11:36:45 +0100; Tests on a NOS 811 (dated 1944): The filament - grid circuit shows goes through 'short' at about 200MHz, and 'open' at about 500MHz. Feed through (50 ohm source and load) is -40dB or lower up to 100M; /archives//html/Amps/2005-04/msg00159.html (6,778 bytes)
4. Re: [Amps] Grid resonance (score: 1): Author: Richard Measures <r@somis.org>; Date: Fri, 8 Apr 2005 04:07:29 -0700; The 8877 needs to be installed in a socket on a flat metal sheet - with the grid grounded via an Eimac grid-grounding collet. The needed measurement is to find the freq. where grid-Z is maximal. Rich; /archives//html/Amps/2005-04/msg00163.html (8,988 bytes)
5. Re: [Amps] Grid resonance (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 18:00:49 +0100; If someone can provide the fixture, I'll happily measure the impedances. I can report that attaching small and large sheets of metal to the grid ring while measuring the cathode-grid impedance makes; /archives//html/Amps/2005-04/msg00178.html (8,652 bytes)
6. Re: [Amps] Grid resonance (score: 1): Author: "John Vickers" <wa4tt@nlamerica.com>; Date: Fri, 8 Apr 2005 13:31:34 -0400; And my guts tell me that the 'Witch Doctors' maybe needing a bit of Pepto Bismal before long. John WA4TT _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2005-04/msg00180.html (7,757 bytes)
7. Re: [Amps] Grid resonance (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Fri, 8 Apr 2005 14:50:04 -0400; I suspect .5" is a bit conservative (short) for some of the poor grounding examples I've seen - particularly those that use a series resistor for grid metering. Much more than .5" and I suspect you'; /archives//html/Amps/2005-04/msg00182.html (8,051 bytes)
8. Re: [Amps] Grid resonance (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 19:57:34 +0100; Yes - I'm not sure if it's relevant that the impedance goes 'short' at that frequency - I figure it's the feedthrough (feedback if you prefer) figures that matter more. Grid and other 'resonances' al; /archives//html/Amps/2005-04/msg00183.html (8,410 bytes)
9. [Amps] grid resonance (score: 1): Author: "carl s." <carlseye@tampabay.rr.com>; Date: Wed, 02 Aug 2006 19:14:29 -0400; How would one go about checking the resonant frequency of the grid ckt of a tube such as the 572B or the 811A or any similar tube for that matter ??? something I never thought about before !!! I just; /archives//html/Amps/2006-08/msg00057.html (6,434 bytes)
10. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 2 Aug 2006 21:26:49 -0400; It's not too complicated Carl. You have to know what frequency is the parallel resonance. Series resonances, which mean the grid is most effective, will show up on a GDO. You are also measuring outs; /archives//html/Amps/2006-08/msg00060.html (9,277 bytes)
11. Re: [Amps] grid resonance (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Wed, 02 Aug 2006 18:38:13 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- Say what? I thought GDOs only detected parallel resonances. I was taught that to check a series resonance one had to connect the two open ends together, thus m; /archives//html/Amps/2006-08/msg00061.html (6,960 bytes)
12. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 2 Aug 2006 22:13:01 -0400; Say what? I thought GDOs only detected parallel resonances. I was taught that to check a series resonance one had to connect the two open ends together, thus making a parallel resonance.>> Think a li; /archives//html/Amps/2006-08/msg00062.html (7,035 bytes)
13. Re: [Amps] grid resonance (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Wed, 02 Aug 2006 21:04:15 -0600; Pardon my ignorance. What does "leveled source" mean? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00063.html (7,034 bytes)
14. Re: [Amps] grid resonance (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Wed, 02 Aug 2006 20:50:17 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- You missed the point of my question. You stated that a GDO can be used to find a series resonance. My understanding is that's not correct. Is it? Bill, W6WRT _; /archives//html/Amps/2006-08/msg00064.html (7,878 bytes)
15. Re: [Amps] grid resonance (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 02 Aug 2006 23:14:14 -0400; Chris, Generally, a "leveled signal" is a signal that does not vary over its entire bandspread. In other words, it will have the same peak to peak voltage sine wave over the span. They make speacial; /archives//html/Amps/2006-08/msg00066.html (8,062 bytes)
16. Re: [Amps] grid resonance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 03 Aug 2006 07:50:07 +0100; I'd be interested - it's valuable info and I'd like to see how someone else's tests compare with what I got last year: http://lists.contesting.com/archives//html/Amps/2005-04/msg00153.html Steve ____; /archives//html/Amps/2006-08/msg00069.html (7,987 bytes)
17. Re: [Amps] grid resonance (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 3 Aug 2006 09:27:34 +0200 (CEST); to find a series resonance. My understanding is that's not correct.< If you short the component out, doesn't it become a parallel resonance? So if the Q is too low, the frequency will be different. 7; /archives//html/Amps/2006-08/msg00072.html (7,993 bytes)
18. Re: [Amps] grid resonance (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 3 Aug 2006 09:34:53 +0200 (CEST); tell where the antenna connected at the other end is high impedance or low impedance! Why would anyone do that?< I don't see what a GDO would tell you, but an impedance bridge would - although you wo; /archives//html/Amps/2006-08/msg00073.html (8,730 bytes)
19. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 3 Aug 2006 06:04:42 -0400; Constant voltage swept frequency source, and you detect voltage at the anode. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2006-08/msg00079.html (7,958 bytes)
20. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 3 Aug 2006 07:08:44 -0400; You missed the point of my question. You stated that a GDO can be used to find a series resonance. My understanding is that's not You missed my point also. We shouldn't apply a snip of fact to a comp; /archives//html/Amps/2006-08/msg00081.html (9,772 bytes)

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