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221. [AMPS] New 3cx800a7 and 4cx1600b Svetlanas (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 20 Jul 2001 17:05:52 +0100; Also there's no way that a GS35b is an 8877. They are both triodes with 1500W anode dissipation, but *everything* else about them is different! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Pra; /archives//html/Amps/2001-07/msg00241.html (9,382 bytes)
222. [AMPS] New 3cx800a7 and 4cx1600b Svetlanas (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 20 Jul 2001 22:06:58 +0100; To be fair, "equivalent' has always been a rather elastic term. It can range from exactly the same device from the same factory but with a different number, out to as far as you care to stretch it. T; /archives//html/Amps/2001-07/msg00245.html (9,528 bytes)
223. [AMPS] 50~ vs 60~ ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 2 Jun 2001 15:15:52 +0100; Henry amps of the 2 x 8874 vintage had a variety of problems on 50Hz. First was core saturation because the transformer was too small; second, the tuning cap for the smoothing choke was designed for; /archives//html/Amps/2001-06/msg00010.html (8,977 bytes)
224. [AMPS] 4cx250* amp building plans (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Jun 2001 13:25:11 +0100; "Grounded grid" gets a bad name because of the amateur practice of connecting both grids to chassis ground. As Rich says, the control grids of most modern tetrodes won't handle the excessive grid cur; /archives//html/Amps/2001-06/msg00049.html (10,055 bytes)
225. [AMPS] 4cx250* amp building plans (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Jun 2001 13:48:46 +0100; It still fits into the broad classification of grounded grid. After all, when a grid-driven amp has a small amount of cathode resistance, we still call it grounded-cathode. Peter has an unfair advant; /archives//html/Amps/2001-06/msg00051.html (9,374 bytes)
226. [AMPS] Review of Antenna Tuner from Dayton (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 21 Jun 2001 07:48:11 +0100; Actually, there is. In RadCom about a year ago, G3LNP described a very simple add-on rotary switch to short the capacitor completely at maximum. This converts the T-network to an L-network. By shorti; /archives//html/Amps/2001-06/msg00222.html (11,025 bytes)
227. [AMPS] FT1000MP and MLA2500 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 22 Jun 2001 22:43:01 +0100; There is a RF hold-off facility on the accessory socket of both the 1000MP and the 990, intended for use with the Yaesu linear. When the DIN plug is in the socket, it requires a ground on the appropr; /archives//html/Amps/2001-06/msg00263.html (7,688 bytes)
228. [AMPS] vacuum caps (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 23 Jun 2001 08:42:25 +0100; No. If the leak is in one of the glass/metal seals - as seems likely - then that's the end. Because of the way the metal and glass have to be processed and then joined, those seals can only be made c; /archives//html/Amps/2001-06/msg00267.html (7,482 bytes)
229. [AMPS] Drake DL1000 dummy load - ratings? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 3 May 2001 07:35:03 +0100; Do any of you Drake fans have Drake's original ratings for this item? It's just a 10" x 1" diameter Carborundum resistor in a perforated box. There seems to be an option to install a fan, but I'm sur; /archives//html/Amps/2001-05/msg00042.html (7,213 bytes)
230. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 9 May 2001 12:40:34 +0100; For amps that use a significant run of coax between the input picircuits and the socket, the coax must act as a high-impedance quarterwave stub at some VHF frequency, because it's shorted at the othe; /archives//html/Amps/2001-05/msg00133.html (9,816 bytes)
231. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 10 May 2001 07:35:38 +0100; That's surely true! May be worth trying, then... Agreed. Picking up Rich's point, adding or removing the covers is definitely going to make some changes in the current distribution inside the enclosu; /archives//html/Amps/2001-05/msg00154.html (11,973 bytes)
232. [AMPS] PSU Question (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 11 May 2001 23:33:50 +0100; To get the best out of a GS35b you need 3.5kV on-load. 3.2kV is marginal and at 2.8kV it's really fading - the gain drops and it needs a lot of drive. On the other hand, you don't want to go above 4k; /archives//html/Amps/2001-05/msg00195.html (8,326 bytes)
233. [AMPS] Voltage Doublers (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 16 May 2001 12:56:07 +0100; In one word, DON'T. The secondary resistance of the transformer - combined with the effects of primary resistance and diode on-resistance, which you also need to factor in - will ruin the voltage reg; /archives//html/Amps/2001-05/msg00302.html (12,207 bytes)
234. [AMPS] Voltage Doublers (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 16 May 2001 18:37:38 +0100; That's for a significantly higher-voltage transformer (1175V?), and I seem to remember more than 10% droop at full load. For this application Glenn needs every last volt he can get, because even the; /archives//html/Amps/2001-05/msg00313.html (15,884 bytes)
235. [AMPS] Voltage Doublers (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 16 May 2001 19:38:49 +0100; Sorry - what I meant was, "the FW*D* one would be significantly *heavier* because..." 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/; /archives//html/Amps/2001-05/msg00316.html (9,159 bytes)
236. [AMPS] Voltage Doublers (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 17 May 2001 14:59:33 +0100; Not duff at all, Steve. I get the same values as you, so I was wrong about including the resistance contribution of the diode strings. It seems that the diodes should be regarded as only a source of; /archives//html/Amps/2001-05/msg00330.html (9,806 bytes)
237. [AMPS] DJ5RE 2m Amplifier Tuning - Longish (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 20 May 2001 09:28:41 +0100; To: <amps@contesting.com> Sorry I wasn't available to come back to Phil yesterday. Significant grid current in a GS35b at idle current seems very unusual. Assuming there is no deliberate RF drive and; /archives//html/Amps/2001-05/msg00366.html (9,858 bytes)
238. [AMPS] Conjugate Matching and Efficiency (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 13:25:25 +0100; I don't think it's a matter for "correction", but of several equivalent viewpoints. Since they are all analysing the same reality, all of these viewpoints MUST agree. Any one of them can be used to c; /archives//html/Amps/2001-05/msg00454.html (12,161 bytes)
239. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 15:21:19 +0100; Can you remind us where the markings are in those two amps, for each of the tubes, in relation to the 'upstream' side? (Just wondering how much difference that makes.) 73 from Ian G3SEK Editor, 'The; /archives//html/Amps/2001-05/msg00458.html (9,204 bytes)
240. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 21:24:11 +0100; Yes, I'm aware that happens - but what that party trick demonstrates is that at *low* velocities the airflow remains attached to the surface and flows smoothly around it to join up again at the far s; /archives//html/Amps/2001-05/msg00462.html (10,508 bytes)

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