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1. [Amps] Re: matching network (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Mon, 26 Jan 2004 07:01:37 -0600; Ray asked, "That's where I'm at, and my question for the experts is: what kind of matching network at the cathodes of the 4CX-350's is recommended??" I'm not expert, but I recommend a pi-net with a w; /archives//html/Amps/2004-01/msg00292.html (6,739 bytes)
2. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 26 Jan 2004 07:34:03 -0800; ** In a grounded-grids, tetrode amplifier, c. 75% of the total grid current flows in the control grid and c. 25% of the current flows in the screen grid. The max control-grid-current rating for the 4; /archives//html/Amps/2004-01/msg00300.html (7,524 bytes)
3. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 27 Jan 2004 10:24:44 +0000; R. Measures wrote: ** In a grounded-grids, tetrode amplifier, c. 75% of the total grid current flows in the control grid and c. 25% of the current flows in the screen grid. We need to be very careful; /archives//html/Amps/2004-01/msg00305.html (8,769 bytes)
4. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 27 Jan 2004 19:27:56 -0800; ** which means? ** True, but g1-g2 amplification is typically 4 to 5. ** Especially above 1GHz. ** The 2mA max grid current rating would seem to preclude grounded grid operation. ___________________; /archives//html/Amps/2004-01/msg00316.html (8,756 bytes)
5. Re: [Amps] Re: matching network (score: 1): Author: TexasRF@aol.com; Date: Wed, 28 Jan 2004 10:38:32 EST; A cathode driven configuration doesn't inherently cause excessive grid current. If proper grid and screen voltages are supplied, the grid current is a function of grid bias voltage and drive level, j; /archives//html/Amps/2004-01/msg00321.html (8,677 bytes)
6. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 28 Jan 2004 09:12:55 -0800; design. ** The thing that makes tetrode RF grounded-grid different from tetrode grid-driven is that in grid-driven, the RF driving signal exists between the RF-grounded screen and the control grid.; /archives//html/Amps/2004-01/msg00324.html (9,780 bytes)
7. Re: [Amps] Re: matching network (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 28 Jan 2004 09:26:11 -0800; < snip > I'm pretty sure Ian means that both grids need to be bypassed to ground, if you're going to drive the cathode. But I think Rich and Ian (and I) agree that doing a "grounded-grid" amplifier u; /archives//html/Amps/2004-01/msg00325.html (8,258 bytes)
8. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 28 Jan 2004 14:41:06 +0000; R. Measures wrote: R. Measures wrote: ** In a grounded-grids, tetrode amplifier, c. 75% of the total grid current flows in the control grid and c. 25% of the current flows in the screen grid. We need; /archives//html/Amps/2004-01/msg00327.html (11,352 bytes)
9. Re: [Amps] Re: matching network (score: 1): Author: TexasRF@aol.com; Date: Wed, 28 Jan 2004 16:48:47 EST; One further clarification, in grid driven configuration: yes, the screen is grounded for r.f. but so is the cathode (less so if a degeneration resistor is used), so the drive is still applied between; /archives//html/Amps/2004-01/msg00328.html (8,169 bytes)
10. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 29 Jan 2004 02:09:34 -0800; ** Ian -- How does one convert this figure into a determination of how grid current divides between the grid and the screen during g-g operation? _______________________________________________ Amps; /archives//html/Amps/2004-01/msg00335.html (9,148 bytes)
11. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 29 Jan 2004 02:27:35 -0800; ** Good point, George. Not only would the conversion be extensive, the 2mA limit on control-grid current would seem to suggest that a 4cx350 could not be driven to 100% of it's emissive capability i; /archives//html/Amps/2004-01/msg00336.html (9,306 bytes)
12. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 29 Jan 2004 03:28:12 -0800; ** When no drive potential exists between the screen and the grid, the tetrode acts as a triode. This is why applying DC screen potential to a g-g tetrode does not increase amplification or reduce t; /archives//html/Amps/2004-01/msg00337.html (8,548 bytes)
13. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 29 Jan 2004 19:46:18 +0000; R. Measures wrote: What Rich says is only true if both grids are connected directly to chassis (and even then, the current division between g1 and g2 will depend on the mu-g1g2 value for that particu; /archives//html/Amps/2004-01/msg00346.html (9,641 bytes)
14. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 30 Jan 2004 03:38:08 -0800; ** So if a tetrode with a g-/g2 amplification of 4 to 5 has c. 25% of total grid current flowing in the screen, a tube with a g/g2 amplification of 13 might have c. 8% of the total grid-current flow; /archives//html/Amps/2004-01/msg00358.html (9,115 bytes)
15. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 31 Jan 2004 07:03:52 +0000; R. Measures wrote: ** Ian -- How does one convert this figure into a determination of how grid current divides between the grid and the screen during g-g operation? Sorry, maybe what I said was misle; /archives//html/Amps/2004-01/msg00364.html (9,428 bytes)
16. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Sun, 1 Feb 2004 07:25:50 -0800; ** Ian -- The sticky wicket is that there are no characteristic curves for 0V on the screen. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes; /archives//html/Amps/2004-02/msg00005.html (7,795 bytes)
17. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 2 Feb 2004 15:16:00 +0000; R. Measures wrote: R. Measures wrote: ** Ian -- How does one convert this figure into a determination of how grid current divides between the grid and the screen during g-g operation? Sorry, maybe wh; /archives//html/Amps/2004-02/msg00015.html (9,015 bytes)
18. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 3 Feb 2004 03:48:47 -0800; ** Indeed. ... getting back to g-g operation for a tube with a max. g1 rating of 2mA, I would not try it. Even with a stripe-cathode and aligned grid, typical grid currents are c. 100mA in g-g triod; /archives//html/Amps/2004-02/msg00023.html (8,579 bytes)
19. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 4 Feb 2004 07:47:02 +0000; R. Measures wrote: ** Indeed. ... getting back to g-g operation for a tube with a max. g1 rating of 2mA, I would not try it. Even with a stripe-cathode and aligned grid, typical grid currents are c.; /archives//html/Amps/2004-02/msg00028.html (9,015 bytes)
20. Re: [Amps] Re: matching network (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 4 Feb 2004 08:20:49 -0800; ** Ian -- Is the power gain with cathode-driven and no g1 current the same as with 'super-cathode' drive -- i.e., c. 5? - If g1 is never to be driven more positive than the cathode potential, why no; /archives//html/Amps/2004-02/msg00031.html (8,907 bytes)

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