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161. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 01 Aug 2006 16:19:07 +0100; The topology is straightforward enough, not so the idea that one topology won't give high dissipation, the other won't give high voltage. Steve _______________________________________________ Amps ma; /archives//html/Amps/2006-08/msg00002.html (9,042 bytes)
162. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 01 Aug 2006 16:52:41 +0100; OK - I'll speculate it's a manufacturing flaw in the envelope, you speculate that it's a parasitic oscillation working on some magic glass, and we'll agree to differ. Steve __________________________; /archives//html/Amps/2006-08/msg00006.html (8,505 bytes)
163. Re: [Amps] Low Pass Filter capacitor ratings for 1.5kw level (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 01 Aug 2006 23:09:33 +0100; Talking of beer coolers, this one should stimulate any real amp builder. http://www.asciimation.co.nz/beer/ Steve _______________________________________________ Amps mailing list Amps@contesting.co; /archives//html/Amps/2006-08/msg00018.html (8,042 bytes)
164. Re: [Amps] Limits of a Power transformer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 02 Aug 2006 07:45:04 +0100; There's a useful tool at http://www.duncanamps.com/psud2/index.html Plug in your values and get predictions of what your PSU will do in practice (accurate predictions in my experience). Run with zero; /archives//html/Amps/2006-08/msg00031.html (8,201 bytes)
165. Re: [Amps] Limits of a Power transformer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 02 Aug 2006 11:07:55 +0100; If you use the PSU simulater, don't forget to use the total 'effective Rs', not just the secondary resistance, with the secondary rms current to get the dissipation in the transformer. In this case,; /archives//html/Amps/2006-08/msg00040.html (8,254 bytes)
166. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 02 Aug 2006 11:36:27 +0100; Unless I've been labouring under a misapprehension, the melting was attributed to a vhf parasitic rather than normal hf operation. I reckon that glass which changes its loss so much between those fre; /archives//html/Amps/2006-08/msg00041.html (10,084 bytes)
167. Re: [Amps] grid resonance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 03 Aug 2006 07:50:07 +0100; I'd be interested - it's valuable info and I'd like to see how someone else's tests compare with what I got last year: http://lists.contesting.com/archives//html/Amps/2005-04/msg00153.html Steve ____; /archives//html/Amps/2006-08/msg00069.html (7,987 bytes)
168. Re: [Amps] What exactly is a GDO ? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 04 Aug 2006 07:24:54 +0100; Ahh - But does it need to monitor the dip in gate current to deserve the name? I have one that uses dual gate MOSFETs, so there's no gate current. The detector monitors the supply current to the osci; /archives//html/Amps/2006-08/msg00132.html (7,804 bytes)
169. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 05 Aug 2006 07:40:21 +0100; Sure, but that's change in frequency of x400,000, not x4. How does nylon do at 200Hz? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2006-08/msg00171.html (8,638 bytes)
170. Re: [Amps] Options (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 06 Aug 2006 08:27:55 +0100; What's minimal - modest power or no frills, or? What are you wanting out of it - a simple amp for minimum effort or some fun experimenting? If it's the former, I think there's incompatibility in the; /archives//html/Amps/2006-08/msg00201.html (8,102 bytes)
171. Re: [Amps] grid resonance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 06 Aug 2006 23:33:02 +0100; In a finite universe I figure there's always going to be some capacitance and/or inductance and/or resistance between the 'open' ends of a series L and C, so everything is a parallel circuit. The iss; /archives//html/Amps/2006-08/msg00235.html (8,072 bytes)
172. Re: [Amps] Ameritron Amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 07 Aug 2006 10:28:06 +0100; RL is the effective or equivalent resistance between the anode and ground? Gain is inversely proprtional to RL? Steve _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2006-08/msg00245.html (9,258 bytes)
173. Re: [Amps] grid resonance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 08 Aug 2006 08:29:16 +0100; Anything you like, as long as it meets the two crucial requirements of a religion. It must lend itself to obfuscation and it must be capable of interpretation in mutually exclusive, dogmatic, ways. A; /archives//html/Amps/2006-08/msg00278.html (9,615 bytes)
174. Re: [Amps] grid resonance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 08 Aug 2006 09:22:01 +0100; Sorry, that's a typo - I meant super species. Come to think of it, maybe they're not mutant at all - after all, their body clocks are aligned to the One True Time. Steve ____________________________; /archives//html/Amps/2006-08/msg00279.html (9,059 bytes)
175. Re: [Amps] Tuned Input - IMD and efficiency (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 08 Aug 2006 22:44:54 +0100; Tom mentioned a point that's been observed before when the topic comes up - a key aspect of the input circuit appears to be the impedance at harmonic frequencies at the cathode. If you have a pi netw; /archives//html/Amps/2006-08/msg00305.html (10,738 bytes)
176. Re: [Amps] Spam from Members of this List ... (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 09 Aug 2006 07:34:25 +0100; Can I highlight one thing in this regard - I get emails intentionally sent to a large list of people from someone's address book. Maybe it's about amps policy, maybe an address change or new mobile n; /archives//html/Amps/2006-08/msg00324.html (8,415 bytes)
177. Re: [Amps] Tuned Input - IMD and efficiency (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 09 Aug 2006 08:04:53 +0100; I agree that's the fundamental problem, but the cathode ends up as part of the oscillator circuit. Mine is a very simplistic view, but capacitance from the cathode to grid acts as a potential divide; /archives//html/Amps/2006-08/msg00325.html (10,571 bytes)
178. Re: [Amps] Spam from Members of this List ... (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 09 Aug 2006 15:23:24 +0100; I'm sure there's a setting in the preferences when you register that removes the multiple copies if someone sends to the list and to the individual. Steve ____________________________________________; /archives//html/Amps/2006-08/msg00334.html (9,927 bytes)
179. Re: [Amps] solid-state amp "suckout" (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 10 Aug 2006 21:34:35 +0100; What are the modules? Resonances in the transformers or feedback networks can cause this, but be prepared for your amplifiers to have unique problems. It might be that the fundamental frequency load; /archives//html/Amps/2006-08/msg00388.html (7,499 bytes)
180. Re: [Amps] Checking for IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 11 Aug 2006 17:25:28 +0100; Single Sideband Principles and Circuits includes a section on calculating IMD from measurements of input vs output voltage. I reckon this will include any effects from power supply sag. For amplifier; /archives//html/Amps/2006-08/msg00401.html (8,745 bytes)

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