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141. Re: [Amps] Tuned inputs (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Wed, 21 Apr 2010 14:34:39 +0100; And who was it who said 'when all else fails, read the instructions' ? :-) D wierd effect from the un-un.? Both the FT1000 and IC7800 do the same thing but are fine into other non-perfectly-matched l; /archives//html/Amps/2010-04/msg00588.html (8,353 bytes)
142. Re: [Amps] Tuned inputs (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Wed, 21 Apr 2010 15:38:23 +0100; Thanks Phil. I can identify with the tuner whose job is an exercise in never-ending futility....I know how it feels.... Presumably, then, the un-un is just that: an impedence transformer, but one wit; /archives//html/Amps/2010-04/msg00589.html (9,676 bytes)
143. Re: [Amps] How to clean tube fins (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sat, 24 Apr 2010 11:15:10 +0100; I bought an old Heath SB220 from a silent key sale in Liverpool many years ago. The whole amp was orange/brown. I marvelled at what pretty gold anodising Heath must have used. I also thought that the; /archives//html/Amps/2010-04/msg00636.html (8,482 bytes)
144. Re: [Amps] Transformer 50/60hz (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sat, 24 Apr 2010 11:15:19 +0100; I wouldn't bother. There will be very little difference. If you were to runit on aircraft 400hz then things might be a bit different... Dave G0OIL Gentlemen, I would appreciate some advice from the t; /archives//html/Amps/2010-04/msg00637.html (8,474 bytes)
145. Re: [Amps] How to clean tube fins (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sun, 25 Apr 2010 12:38:38 +0100; LOL! I figure that paper capacitors may come off even worse.. I just did a great job of de-gunking a pair of Mercedes V8 cylinder heads, though.. Don't put the transformer in the washer. You will be; /archives//html/Amps/2010-04/msg00645.html (8,257 bytes)
146. Re: [Amps] How to clean tube fins (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sun, 25 Apr 2010 19:50:07 +0200; No, Ron - after so many years she's used to my eccentricities by now. The only time she really yelled at me was when she came home to find a dismantled transmission on the kitchen table (with small p; /archives//html/Amps/2010-04/msg00652.html (9,009 bytes)
147. Re: [Amps] GS-35B optimum B+ for efficiency/power out (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Tue, 27 Apr 2010 23:43:35 +0200; Personally I'd say that 4kv is a little on the high side for a gs35 but I've seen plenty of circuits that use that kind of HT with that tube. Sufficient cooling is the key to success. Look through th; /archives//html/Amps/2010-04/msg00673.html (8,862 bytes)
148. Re: [Amps] Helping a Uruguayan Ham build an Amp. (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Wed, 28 Apr 2010 00:02:44 +0200; The cost differential is very large though - ?100 in Europe for a GS35 compared to heaven-knows-what for a 8877. Sure, GS35Bs are lower mu and lower efficiency than 8877s but they are great examples; /archives//html/Amps/2010-04/msg00677.html (9,289 bytes)
149. Re: [Amps] hi (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 7 May 2010 20:31:23 +0000 (GMT); The answer is always 42 It's nice to see that someone else remembers the work of the late Douglas Adams Dave G0OIL the answer is 42.. Mo, DD9FJ _______________________________________________ Amps ma; /archives//html/Amps/2010-05/msg00103.html (7,968 bytes)
150. Re: [Amps] A word of Caution for my Ham Radio Brethren! (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Tue, 18 May 2010 09:33:18 +0200; Thanks for the heads-up. Why don't you open a couple of ebay accounts and bid it up to a million dollars just before the end.....then let him spend weeks trying to get his final value fee refunded? '; /archives//html/Amps/2010-05/msg00168.html (8,852 bytes)
151. Re: [Amps] Heath copyright (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 21 May 2010 17:27:28 +0000 (GMT); "She then told me the price of $520 for the photocopy. I choked and ungracefully declined the purchase. The company is a military supplier." now guess where your tax dollars go..... Dave G0OIL Well; /archives//html/Amps/2010-05/msg00248.html (10,362 bytes)
152. Re: [Amps] New High Efficiency 3-500Z plate caps (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 2 Jul 2010 09:28:42 +0000 (GMT); I don't want to be branded as a cynic (OK, OK, as any MORE of a cynic...), but let's just say that it's the job of the marketing department to encourage people to think that they need a product that; /archives//html/Amps/2010-07/msg00024.html (13,664 bytes)
153. Re: [Amps] parasitic suppressor voodoo (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Thu, 15 Jul 2010 19:34:19 +0000 (GMT); On a 2 times 4-1000A amp (5.5kv, grounded grid, cathode driven) I used two separate parasitic suppressors, each with 3 paralleled 50 ohm carbon resistors inside a 15mm diamater two-turn coil of 2mm c; /archives//html/Amps/2010-07/msg00126.html (8,655 bytes)
154. Re: [Amps] 2 x 4-1000 supressor. (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 16 Jul 2010 05:40:41 +0000 (GMT); I have no idea if there's supposed to be a specific value of resistor - but 50 ohm carbons was what I had at the time (I bought a boxfull at a hamfest fleamarket!) and they looked a bit weedy - so t; /archives//html/Amps/2010-07/msg00147.html (10,445 bytes)
155. Re: [Amps] Size of Parasitic Chokes (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Fri, 16 Jul 2010 08:29:35 +0100; My current 3CX3000 amp has no parasitic suppressor at all. I originally built one using a coil and a large 50 ohm carbon resistor but found low efficiency. I spoke to Reid Brandon W6MTF at Eimac and; /archives//html/Amps/2010-07/msg00152.html (8,699 bytes)
156. Re: [Amps] Check out my photos on Facebook (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Fri, 16 Jul 2010 11:01:00 +0100; Thanks but I'm too choosy about the company I keep to join Arsebook :-) Dave G0OIL Hi, I set up a Facebook profile where I can post my pictures, videos and events and I want to add you as a friend so; /archives//html/Amps/2010-07/msg00154.html (8,347 bytes)
157. Re: [Amps] parasitic suppressor voodoo (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Fri, 16 Jul 2010 13:20:37 +0100; Maybe another reason that we don't see too many worked-through rigorous calculations is that there are so many variables in play and since parasitics result from positive feedback the smallest variat; /archives//html/Amps/2010-07/msg00158.html (9,360 bytes)
158. Re: [Amps] triode or tetrode (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Fri, 27 Aug 2010 10:09:31 +0100; For me, building is half the fun ... Probably more than half. If anything with building I tend to overengineer and leave more of a component safety margin than lashing things together as a filthy bod; /archives//html/Amps/2010-08/msg00401.html (10,222 bytes)
159. Re: [Amps] triode or tetrode (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 27 Aug 2010 16:37:25 +0000 (GMT); The downside, of course, is that I've spent the last 20 years trawling fleamarkets and amassing useful parts (ok, my wife calls it "junk") that I may need some day. In my case (I think I must be des; /archives//html/Amps/2010-08/msg00406.html (9,562 bytes)
160. Re: [Amps] Tubes, made in the USA, in the olden days; Films? (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Mon, 30 Aug 2010 19:18:43 +0000 (GMT); Yes, the GU81M is somewhat legendary amongst the Eastern European crowd. I'm told that they withstand more abuse than an old Land Rover and keep going long after conventional wisdom indicates that; /archives//html/Amps/2010-08/msg00474.html (11,334 bytes)

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