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1. [Amps] grounding grids (score: 1): Author: Gudguyham@aol.com; Date: Tue, 25 Sep 2007 09:17:17 EDT; The subject has come up in the other thread about good amplifier design, attention to what is "right" and "wrong" etc. I would like to know HOW....if....grounding grids through caps like Heath SB-220; /archives//html/Amps/2007-09/msg00259.html (7,021 bytes)
2. Re: [Amps] grounding grids (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 25 Sep 2007 11:12:29 -0400; I've explained that dozens of times. Bill Orr copied that idea from Collins. He totally misunderstood and misapplied a great idea Collins had for the AB1 tetrode with grounded screen in the 30S1, an; /archives//html/Amps/2007-09/msg00270.html (9,432 bytes)
3. Re: [Amps] grounding grids (score: 1): Author: "RICHARD GEORGE" <k6kwq@msn.com>; Date: Tue, 25 Sep 2007 08:23:26 -0700; What would we do with out Tom! Now he is smarter then the much published Bill Orr. -- Original Message -- From: Tom Rauch<mailto:w8ji@contesting.com> To: amps@contesting.com<mailto:amps@contesting.co; /archives//html/Amps/2007-09/msg00271.html (10,312 bytes)
4. Re: [Amps] grounding grids (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 25 Sep 2007 09:27:32 -0700; I don't know about smarter or not, but he is certainly right about the grids, the folded monopole, the nichrome, and the balun. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco __________________; /archives//html/Amps/2007-09/msg00283.html (7,361 bytes)
5. Re: [Amps] grounding grids (score: 1): Author: "Administrator" <amps@myrealbox.com>; Date: Tue, 25 Sep 2007 12:36:44 -0400; The SB-200, 6 Meter and "grounding grids" threads are finished. the have all degenerated into name calling and have lost any technical value. Administrator, amps@contesting.com When one "owns" the pr; /archives//html/Amps/2007-09/msg00285.html (7,705 bytes)
6. Re: [Amps] grounding grids (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 26 Sep 2007 07:50:19 +0200 (CEST); Shielded ground leads can be very useful - but you must not connect the shield at both ends. They're used like that a lot in TEMPEST work. But because the s parameters (or y or z) vary with frequency; /archives//html/Amps/2007-09/msg00315.html (7,602 bytes)
7. [Amps] grounding grids (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Mon, 27 Jul 2009 20:35:19 -0400; RE: > >Hi. REPLY: I'm curious - what would be the reason for using resistors and decoupling caps? 73, Bill W6WRT == Herzog proffers a reason, to be able to measure the grid current. _________________; /archives//html/Amps/2009-07/msg00345.html (6,789 bytes)
8. Re: [Amps] grounding grids (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 29 Jul 2009 09:28:05 -0400; Maybe to measure individual grid currents? That would be the only reason I can think of. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2009-07/msg00350.html (7,833 bytes)
9. Re: [Amps] grounding grids (score: 1): Author: "Steven Grant, W4IIV" <stevengrant98@yahoo.com>; Date: Wed, 29 Jul 2009 07:44:35 -0700 (PDT); This was used on newer tubes (3-500Z - ect) to raise the resonance of the grid to control parasitics. It is not needed for older tubes STEVEN GRANT W4IIV Maybe to measure individual grid currents? Th; /archives//html/Amps/2009-07/msg00351.html (9,016 bytes)
10. Re: [Amps] grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 29 Jul 2009 12:22:22 -0400; The grid resonance of the 3-500Z and similar tubes has been measured well above 100 MHz. There is no need to "float" the grid. In fact, floating the grid will lower the grid resonance by increasing; /archives//html/Amps/2009-07/msg00357.html (11,808 bytes)
11. Re: [Amps] grounding grids (score: 1): Author: "Bill W5WVO" <w5wvo@cybermesa.net>; Date: Wed, 29 Jul 2009 10:57:59 -0600; How would you characterize, then, the design of the SB-220, where the 3-500Z grids are grounded through RFCs and bypassed by dsk ceramic caps? Particularly since this particular amplifier has been co; /archives//html/Amps/2009-07/msg00360.html (11,826 bytes)
12. Re: [Amps] grounding grids (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Wed, 29 Jul 2009 20:28:33 +0300; ...the key to the stability is the capacitors! From an RF point of view, the grid is grounded and well, since capacitors work well at 6 meters. Alex 4Z5KS How would you characterize, then, the design; /archives//html/Amps/2009-07/msg00361.html (12,490 bytes)
13. Re: [Amps] grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 29 Jul 2009 17:49:20 -0400; The Grid is far from "well grounded." With 220 pF in series, the grids are above ground by 25 Ohms (Xc) at 28 MHz and 206 Ohms (Xc) at 3.5 MHz (the design operating range of the SB-220) ignoring the; /archives//html/Amps/2009-07/msg00367.html (15,073 bytes)
14. Re: [Amps] grounding grids (score: 1): Author: audioguy@charter.net; Date: Wed, 29 Jul 2009 22:10:39 +0000; So why did Heath do it then? (Chokes et al) Inquiring minds want to know 73, --jim Sent from my BlackBerry® wireless device from U.S. Cellular The Grid is far from "well grounded." With 220 pF in ser; /archives//html/Amps/2009-07/msg00369.html (16,278 bytes)
15. Re: [Amps] grounding grids (score: 1): Author: TexasRF@aol.com; Date: Wed, 29 Jul 2009 18:18:50 EDT; Didn't Heath use the ungrounded grids as a way to apply cutoff bias during standby? Seems the internal antenna relays were connected between a -130vdc supply and the grids. The connection to the grid; /archives//html/Amps/2009-07/msg00370.html (16,928 bytes)
16. Re: [Amps] grounding grids (score: 1): Author: RICHARD SOLOMON <w1ksz@q.com>; Date: Wed, 29 Jul 2009 22:54:01 +0000; The answer is in the Heath Manual, if I could figure out how to cut and paste from a pdf file I would have included it. It's on page 83. Now if you agree or don't agree that's another thread !! 73, D; /archives//html/Amps/2009-07/msg00372.html (17,608 bytes)
17. Re: [Amps] grounding grids (score: 1): Author: Jim Barber <audioguy@charter.net>; Date: Wed, 29 Jul 2009 17:20:13 -0700; Oh the torture... For usn's that don't have the SB-220 manual, anyway. Or, come to think of it... do I? This might require a romp through the stacks. That usually turns something up, although rarely; /archives//html/Amps/2009-07/msg00374.html (19,229 bytes)
18. Re: [Amps] grounding grids (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 29 Jul 2009 18:07:37 -0400; Yes, that is what I did in a circuit to protect 8122's from drive without any plate voltage. We came up with a circuit fast enough to protect the grid from burning up; which removed the drive. It als; /archives//html/Amps/2009-07/msg00376.html (11,575 bytes)
19. Re: [Amps] grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 29 Jul 2009 21:35:47 -0400; Pin 2, 3 and 4 of each tube are connected together internally. Each of the three grid pins is bypassed to ground. This combination of RF chokes and capacitors provides a predetermined level of negat; /archives//html/Amps/2009-07/msg00377.html (18,724 bytes)
20. Re: [Amps] grounding grids (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Wed, 29 Jul 2009 21:45:52 -0400; Not in the SB-220, the grid circuit is a 1 mH RF choke bypassed with three 200 pF disk ceramic capacitors. The SB-200 used a single 200 pF capacitor to bypass the grids of the 572B with a single 33; /archives//html/Amps/2009-07/msg00378.html (19,359 bytes)

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