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1. [Amps] Grounding the grids (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 23 Jul 2007 22:58:07 -0400; Let me inject a little factual history of WHY Heath and others used that asinine idea of floating the grids with a choke. Collins came up with a very good idea in the 30S1. That amp used a cathode dr; /archives//html/Amps/2007-07/msg00397.html (12,836 bytes)
2. Re: [Amps] Grounding the grids (score: 1): Author: "Robert Bonner" <rbonner@qro.com>; Date: Tue, 24 Jul 2007 00:04:03 -0500; I totally agree with Tom about increased stability of the amplifier. One of my teenaged amplifiers was a 3-500 amp. This was before I found the 3-1000 and had a love affair with that tube. The 3-500; /archives//html/Amps/2007-07/msg00399.html (14,003 bytes)
3. Re: [Amps] Grounding the grids (score: 1): Author: Gudguyham@aol.com; Date: Tue, 24 Jul 2007 06:56:06 EDT; I just want to clarify one thing, The poster that said he was going to ground his grids on his L4B and then report differences in "what I was led to believe" power output differences. I don't think y; /archives//html/Amps/2007-07/msg00400.html (7,281 bytes)
4. Re: [Amps] Grounding the grids (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 24 Jul 2007 10:45:23 -0400; Interesting story thats been repeated many times over the years on the reflector. Sort of a continuation of the Bill Orr obsession with an idea. However Ive never seen a simultaneous blown choke and; /archives//html/Amps/2007-07/msg00402.html (16,146 bytes)
5. Re: [Amps] Grounding the grids (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 24 Jul 2007 12:28:36 -0400; I certainly have. ....and you know it is age and moisture, and not an arc? I've got boxes of 50 year old micas here of the same style that aren't split from moisture. ...and you somehow know the arc; /archives//html/Amps/2007-07/msg00404.html (11,485 bytes)
6. Re: [Amps] Grounding the grids (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 24 Jul 2007 12:09:58 -0500; Why do you suppose that Collins put those little 47 ohm resistors in each grid on the 30L1 amplifier? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2007-07/msg00405.html (14,870 bytes)
7. Re: [Amps] Grounding the grids (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 24 Jul 2007 14:13:50 -0400; The same way you know its an arc. Neither of us was watching when it happened. In my cases there was absolutely no other damage and the case was split at the seam, the weak link. I also have replace; /archives//html/Amps/2007-07/msg00406.html (15,645 bytes)
8. Re: [Amps] Grounding the grids (score: 1): Author: Gudguyham@aol.com; Date: Tue, 24 Jul 2007 16:26:12 EDT; Why do you suppose that Collins put those little 47 ohm resistors in each grid on the 30L1 amplifier? 73 Gary K4FMX So they can go POP when you cook em' Lou ** Get a sneak peek of the all-new AOL at; /archives//html/Amps/2007-07/msg00409.html (6,869 bytes)
9. Re: [Amps] Grounding the grids (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 24 Jul 2007 18:28:39 -0400; The same reason Heath used 33 Ohms on the SB-200/201. They are an attempt to stabilize and also act as current limiters in case of nasty things trying to happen. They often blow open during a run awa; /archives//html/Amps/2007-07/msg00412.html (8,244 bytes)
10. Re: [Amps] Grounding the grids (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 24 Jul 2007 20:58:31 -0400; I can't speak for Collins since I wasn't there and have no first hand knowledge, but in the AL811H and AL572 I put the resistors there to equalize drive. The resistors eliminated the need to match c; /archives//html/Amps/2007-07/msg00415.html (8,944 bytes)
11. Re: [Amps] Grounding the grids (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 25 Jul 2007 08:58:37 +0200 (CEST); The big professional txs that used a GG output stage tended either to have a tube with a grid flange bolted to the chassis, or a collet arrangement that clamped the grid electrically pretty firmly to; /archives//html/Amps/2007-07/msg00425.html (7,346 bytes)

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