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1. [Amps] Pi network tuning (score: 1): Author: "Mike(W5UC) & Kathy(K5MWH)" <w5uc@cox.net>; Date: Sun, 23 Jul 2006 20:38:40 -0500; Good Evening All: Please try this question on for size. With the pi-network built, and the tubes in the sockets and AC coupled to the pi-network, is it possible to determine that the pi-network value; /archives//html/Amps/2006-07/msg00979.html (6,556 bytes)
2. Re: [Amps] Pi network tuning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 22:10:11 -0400; You won't know the impedance transformation, just resonance. The normal procedure is to terminate the anode to ground with the expected tube operating load impedance and check for 50 ohms at the out; /archives//html/Amps/2006-07/msg00980.html (7,772 bytes)
3. Re: [Amps] Pi network tuning (score: 1): Author: "Mike(W5UC) & Kathy(K5MWH)" <w5uc@cox.net>; Date: Sun, 23 Jul 2006 21:33:55 -0500; Thanks Tom. The next question is; Does it matter which side of the blocking capacitor I attach the termination to ground. This is a 50 mHz amp, and to attach to the anodes would mean long leads. If I; /archives//html/Amps/2006-07/msg00982.html (8,227 bytes)
4. Re: [Amps] Pi network tuning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 07:18:34 -0400; Mike, First thing you should keep in mind is the optimum tube load impedance, loaded Q, and the Q you need are all just approximations. There isn't any need to get over-precise with what amount to a; /archives//html/Amps/2006-07/msg01005.html (9,035 bytes)
5. Re: [Amps] Pi network tuning (score: 1): Author: "Mike(W5UC) & Kathy(K5MWH)" <w5uc@cox.net>; Date: Mon, 24 Jul 2006 06:54:09 -0500; Good Morning: The tubes are Gi-7b's. (output capacitance = 4.6 pf/tube) The grids are tied hard to the chassis. I cut holes in the chassis just big enough for the grids to fit through, and then made; /archives//html/Amps/2006-07/msg01006.html (10,588 bytes)
6. Re: [Amps] Pi network tuning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 10:52:03 -0400; All sounds good. If the tubes have conical grid supports and very low lead length it should be very stable. You probably won't even need a suppressor if the grids are compact with short wide connecti; /archives//html/Amps/2006-07/msg01017.html (9,080 bytes)
7. Re: [Amps] Pi network tuning (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 24 Jul 2006 06:35:12 -0700; IME, resonance in a low-pass Pi-type Z-transforming network with a Q of 10 is typically around 10% lower than the operating frequency. R L MEASURES, AG6K. 805-386-3734 r@somis.org ___________________; /archives//html/Amps/2006-07/msg01036.html (9,202 bytes)
8. Re: [Amps] Pi network tuning (score: 1): Author: "Mike(W5UC) & Kathy(K5MWH)" <w5uc@cox.net>; Date: Mon, 24 Jul 2006 19:23:49 -0500; Thanks to all who responded. I will try to do the testing and see what happens. However, probably not tonight. This afternoon we got something called rain, and I need to try to figure out what it is.; /archives//html/Amps/2006-07/msg01049.html (8,339 bytes)

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