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21. Re: [Amps] interesting piece of kit..... (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Thu, 8 Jan 2009 17:11:48 +0000 (GMT); Thanks George. Ah, well. I wasn't too far off guessing at 10 megs then! I seem to remember seeing something like this on the fleamarket at Weinheim UKW Tagung quite some years (10-15+?) ago when th; /archives//html/Amps/2009-01/msg00063.html (10,560 bytes)
22. Re: [Amps] 3CX1500D7 quote (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Thu, 8 Jan 2009 20:58:36 +0000 (GMT); Hi Hsu - yes, most things are made in China these days :-) But the problem is knowing which tubes are good and which ones are no good. In my experience price isn't usually an indicator. Like every; /archives//html/Amps/2009-01/msg00069.html (19,020 bytes)
23. Re: [Amps] 8877 pricing (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Thu, 8 Jan 2009 21:04:42 +0000 (GMT); I think this tube has a slightly different filament voltage? 5.5v versus 5v? I seem to remember this from somewhere in my fading memory (too much RF??). I could be wrong. Clearly it works anyway.; /archives//html/Amps/2009-01/msg00070.html (7,736 bytes)
24. Re: [Amps] 3CPX1500A7 Fil Voltage (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 9 Jan 2009 18:58:44 +0000 (GMT); Thanks to those who pointed this out. I hadn't seen previous discussions. Hey, I learned something today! Thanks folks. cheers Dave G0OIL This issue has been discussed extensively on this and other; /archives//html/Amps/2009-01/msg00072.html (7,391 bytes)
25. Re: [Amps] 3CX1500D7 quote (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Thu, 8 Jan 2009 21:56:37 +0000 (GMT); Hi Hsu - all too true! It's a fine balance - and as ever a balance requires that we lean and correct both ways! 73 OM Dave G0OOIL Hi,Dave Maybe you are right.But maybe you don't know, No manufacture; /archives//html/Amps/2009-01/msg00075.html (20,604 bytes)
26. Re: [Amps] GU81-M on highbands (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sun, 11 Jan 2009 12:03:30 +0000 (GMT); Hi Tom - Somewhere I have a circuit from a Hungarian amateur that uses a single GU81M on 80-15m. I'll try to find it (a major operation in my library, and not one guaranteed of success!!) and scan i; /archives//html/Amps/2009-01/msg00082.html (7,442 bytes)
27. Re: [Amps] GU81-M on highbands (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sun, 11 Jan 2009 18:37:07 +0000 (GMT); Thanks for this, Alex. That really looks like a great amp! No wonder they're loud from EX8A !! cheers Dave there is an EX8A schematic - pair of GU81M with double pi-networks - one of them instead of; /archives//html/Amps/2009-01/msg00085.html (9,141 bytes)
28. Re: [Amps] Silver plated braid (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Wed, 21 Jan 2009 12:22:36 +0000 (GMT); RG214/U usually has a double layer of silver plated braid - at least the stuff I have has. It's German Kamelmetal brand, bought on the fleamarket at Weinheim. cheers Dave G0OIL I think most (all) pt; /archives//html/Amps/2009-01/msg00194.html (8,112 bytes)
29. Re: [Amps] 3-500zs to 8877 (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Wed, 21 Jan 2009 15:48:33 +0000 (GMT); I'd echo this sentiment. You've got a good, tried and tested amp with robust tubes. Why spend the time and money (and run barefoot whilst you're working on it) simply for a lower drive requirement?; /archives//html/Amps/2009-01/msg00201.html (9,833 bytes)
30. Re: [Amps] Power transformer... (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sun, 25 Jan 2009 11:06:20 +0000 (GMT); Hi Bob Whatever you're using now certainly puts a decent signal into Europe on 160! (thanks for the QSL, by the way) Personally I'd put the Yaesu transformer on ebay, get something really big and use; /archives//html/Amps/2009-01/msg00287.html (10,918 bytes)
31. Re: [Amps] Power transformer... (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sun, 25 Jan 2009 11:37:18 +0000 (GMT); Having said that GU81Ms are cheap, I just saw some on ebay for $74 plus shipping from Ukraine. Either they've shot up in price or this seller is a rip-off. They're 45 Euros on this site, which seems; /archives//html/Amps/2009-01/msg00288.html (11,763 bytes)
32. Re: [Amps] Regulated DC heater (score: 1): Author: Dave <mausoptik@btinternet.com>; Date: Mon, 26 Jan 2009 18:46:02 +0000; You took the words from my mouth......but a good question to put in the ham exam question pool don't you think? Cheers Dave G0OIL / K2MOO Charlie It is convention to quote ALL voltages in rms values; /archives//html/Amps/2009-01/msg00303.html (8,767 bytes)
33. Re: [Amps] De-gassing/de-barnacling YC-156 tubes (was Source for YC-156 tubes) (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Wed, 28 Jan 2009 23:14:47 +0000 (GMT); That's fascinating information, Dave. Thanks for that. I always wondered how this was done. Big lads' toys. As for "a responsible amplifier design is one that won't get damaged when an arc occurs"; /archives//html/Amps/2009-01/msg00332.html (10,720 bytes)
34. Re: [Amps] Riley's Replacement (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sat, 31 Jan 2009 08:51:59 +0000 (GMT); Equal opportunities and diversity, remember? It's just the same there as it is here now: http://www.spectator.co.uk/coffeehouse/798356/harriet-harman-unleashes-positive-discrimination.thtml Knowledg; /archives//html/Amps/2009-01/msg00374.html (8,941 bytes)
35. Re: [Amps] Riley's Replacement (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sat, 31 Jan 2009 14:52:42 +0000 (GMT); Just make up an FOC number and bogus reports, and give them to the contesters - ridicule them at their own elitist game. After all, what did Groucho Marx say about clubs? A few years ago, a friend o; /archives//html/Amps/2009-01/msg00376.html (8,980 bytes)
36. Re: [Amps] pole transformer (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sun, 1 Feb 2009 19:28:11 +0000 (GMT); I've been using capacitors full of PCBs for years and it's not done me any harm. See how I look: http://i.treehugger.com/images/2007/10/24/frankenstein-jj-001.jpg cheers Dave G0OIL You are quite en; /archives//html/Amps/2009-02/msg00016.html (11,341 bytes)
37. Re: [Amps] Glitch resistor (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Mon, 2 Feb 2009 23:04:47 +0000 (GMT); I used four 100 ohm resistors in two sets of two in series and parallel - i.e. total glitch resistor of 100 ohms. There's also a 2A HRC fuse in the HT line. Sure, the HT drops a bit under load but; /archives//html/Amps/2009-02/msg00042.html (9,865 bytes)
38. Re: [Amps] bypassing control leads (score: 1): Author: Dave <mausoptik@btinternet.com>; Date: Wed, 4 Feb 2009 11:32:51 +0000; I've always just used feed-thru capacitors for a permanent link and an amphenol-type multiconnector for removable panels and to a separate power supply. If i use a multiconnector I use a .01 bypass c; /archives//html/Amps/2009-02/msg00057.html (8,249 bytes)
39. Re: [Amps] power and db (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Wed, 4 Feb 2009 20:31:46 +0000 (GMT); Probably so - in theory - and a conservatively run amp will run for far longer than one which is being thrashed to death. The amp that's on the bench for repairs or awaiting components when KP1 (the; /archives//html/Amps/2009-02/msg00084.html (9,395 bytes)
40. Re: [Amps] power and db (score: 1): Author: Dave <mausoptik@btinternet.com>; Date: Wed, 4 Feb 2009 22:28:33 +0000; Maybe that's what he meant. As you know, the Great Man had a mischievous mind as well as well as a brilliant one. He certainly seems to have had more of a sense of humour than most academics I worked; /archives//html/Amps/2009-02/msg00096.html (10,095 bytes)

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