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1. [Amps] Grounded grid 8122's (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Tue, 21 Jul 2009 21:00:00 -0400; I dont believe there is any way to run a 4CX250 style tube in GG without destruction. Very few tetrodes have the necessary grid dissipation required. == When our tube vendor became difficult, we hung; /archives//html/Amps/2009-07/msg00256.html (7,004 bytes)
2. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 21 Jul 2009 19:38:08 -0700; ORIGINAL MESSAGE: REPLY: GG does not require any more grid dissipation than grounded cathode. GG does require more driving power, but not for the grid. The extra driving power "modulates" the cathode; /archives//html/Amps/2009-07/msg00259.html (7,980 bytes)
3. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 21 Jul 2009 21:55:21 -0500; Well, no they are not the same. There is a difference in what we all call "grounded grid" and "cathode driven". With a tetrode in grounded grid mode you are driving the grid and the screen. In order; /archives//html/Amps/2009-07/msg00262.html (9,240 bytes)
4. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 21 Jul 2009 23:13:34 -0700; ORIGINAL MESSAGE: REPLY: The difference is mostly semantics. A grounded grid amp where the grid(s) are connected directly to ground is definitely cathode driven. By comparison, a cathode driven amp m; /archives//html/Amps/2009-07/msg00270.html (8,069 bytes)
5. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 22 Jul 2009 20:01:52 -0400; It is not semantics when you are discussing 2 very different amplifier designs. You appear to be the only one trying to combine them as one. Grounded grid where the grids are at DC and RF ground is n; /archives//html/Amps/2009-07/msg00287.html (9,557 bytes)
6. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 22 Jul 2009 20:05:46 -0400; Very good replies Gary and thanks for jumping in. Im up at the cottage in Maine for a few days and just got the blankety blank dial up working. However the line is noisy so my replies will probably b; /archives//html/Amps/2009-07/msg00288.html (11,090 bytes)
7. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 22 Jul 2009 17:16:35 -0700; ORIGINAL MESSAGE: REPLY: I guess we will have to agree to disagree. In both circuits the drive is applied to the cathode (or filament). As long as the grid and screen are maintained at a steady DC le; /archives//html/Amps/2009-07/msg00290.html (8,736 bytes)
8. Re: [Amps] Grounded grid 8122's (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 22 Jul 2009 22:03:34 -0500; How would you propose to run a tetrode in class AB1 with the grid and screen directly grounded? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2009-07/msg00297.html (9,461 bytes)

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