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81. Re: [Amps] QRO Parts (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Tue, 24 Nov 2009 11:56:41 +0000; Zoli HA4XN is also a good source of Russian tubes etc Dave G0OIL No but I prefer to deal with Dr Alex, UR4LL. His prices are much better and if you have Skype, you can talk to him live on camera and; /archives//html/Amps/2009-11/msg00253.html (7,603 bytes)
82. Re: [Amps] SB-220: 1,800 Watts Output (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Mon, 30 Nov 2009 11:11:13 +0100; The chap selling it must be the same one who quoted the EU-approved fuel consumption figures for most cars on sale here ... Like think of a number and double it Cheers Dave G0OIL There's an SB-220 li; /archives//html/Amps/2009-11/msg00298.html (8,641 bytes)
83. Re: [Amps] High Voltage wire (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Thu, 3 Dec 2009 08:41:37 +0000; Ditto Carl's comments. I've used RG213 for years without issues. I did buy some 20kv ht wire from the fleamarket at Friedrichshafen one year but have no idea where to source some. I tend to fill the; /archives//html/Amps/2009-12/msg00069.html (8,734 bytes)
84. Re: [Amps] (no subject) (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Fri, 4 Dec 2009 11:06:04 +0000; It's the unused-for-30-years bit that would worry me. I've seen too many of these things go *BOOM* when fired up or just suffer from ongoing reliability issues. Cheers Dave G0OIL What did they sell f; /archives//html/Amps/2009-12/msg00106.html (7,294 bytes)
85. Re: [Amps] (no subject) (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Fri, 4 Dec 2009 23:26:32 +0000; Hi Roger It's not so much the tubes I'm worried about as the rest of the amplifier. About 10 years ago I bought four unopened 1961-dated Penta 4-1000As in the JAN boxes with what looks like the origi; /archives//html/Amps/2009-12/msg00118.html (8,129 bytes)
86. Re: [Amps] Russian Power Tubes (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Wed, 16 Dec 2009 12:16:51 +0000 (GMT); A lot of people here in Europe have built amps with the GS35B and I hear reports of reliable operation with 4kv on the anode. As Richard alludes, we're experimenters and if things go *BANG* occasion; /archives//html/Amps/2009-12/msg00370.html (10,773 bytes)
87. Re: [Amps] Russian Power Tubes (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Wed, 16 Dec 2009 16:17:01 +0000; And There I was thinking that cows said 'MOOOOOO'. I never heard one hiss.... Dave G0OIL This might be getting off topic, but how does one "hiss a cow"? ...something about vacuum perhaps? jeff, wa1hc; /archives//html/Amps/2009-12/msg00374.html (8,854 bytes)
88. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Wed, 16 Dec 2009 17:11:42 +0000; I'll second that as a good idea. Also you may wish to mount the blower on rubber bushes to stop the vibrations from using the amp chassis as a soundbox and putting sound-deadening lagging in short pi; /archives//html/Amps/2009-12/msg00379.html (9,335 bytes)
89. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Thu, 17 Dec 2009 20:15:00 +0100; I'm sure I'll have something around somewhere. There was reference to water cooled tubes in some of the old Eimac application bulletins. If I get time at the weekend I'll have a dig around the librar; /archives//html/Amps/2009-12/msg00392.html (8,884 bytes)
90. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Thu, 17 Dec 2009 20:16:34 +0000; Wow, an amp that brews tea. I like the idea. If I build with two tubes do I get a choice of assam or darjeeling? D Add a spigot to the return line for morning coffee or afternoon tea. Don WA4NPL ____; /archives//html/Amps/2009-12/msg00399.html (9,269 bytes)
91. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Thu, 17 Dec 2009 20:16:53 +0000; Colin, can you narrow it down a bit beyond 'the fifties'? I have most QSTs from that era but if you or anyone can narrow it below 120 issues..... Cheers Dave Water Cooling: Jo Jennings, W6EI, install; /archives//html/Amps/2009-12/msg00400.html (9,195 bytes)
92. Re: [Amps] Question about GS-35b efficiency (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Fri, 18 Dec 2009 07:38:16 +0000 (GMT); if you can get hold of VK3ZL I know he's recently built a GS35 amp and did a very professional job of it, so he'll no doubt have some answers cheers Dave G0OIL And I'd like to hear more about expecta; /archives//html/Amps/2009-12/msg00421.html (10,711 bytes)
93. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Thu, 17 Dec 2009 20:26:57 +0000; If my memory serves me correctly the Stanley Steamer was actually a vapour phase tube (a 3CV** or 4CV** as opposed to a 3CW** etc) in a boiler rather than a water cooled tube. Eimac published this as; /archives//html/Amps/2009-12/msg00489.html (10,157 bytes)
94. Re: [Amps] condition 4-1000A tubes? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sat, 23 Jan 2010 08:57:59 +0000; Hi Dennis I've usually just installed them in a socket with the correct chimney and blower and powered up the filament starting at a very low voltage (say half a volt) and over the course of a week b; /archives//html/Amps/2010-01/msg00281.html (7,669 bytes)
95. Re: [Amps] condition 4-1000A tubes? (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Sat, 23 Jan 2010 19:32:36 +0000 (GMT); Lol! I bet that's the best dollar you ever spent, Bob! Dave G0OIL Happy New Year Dennis, I just plug mine in and let it rip. That is one rugged tube. When I first build my 4-1000 just for kicks I; /archives//html/Amps/2010-01/msg00290.html (8,570 bytes)
96. Re: [Amps] Tesla Effect - what the heck is that? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sun, 31 Jan 2010 22:50:54 +0100; 'bunch of idiots' seems a bit strong, as does 'just discovering' :-) Google 'teslathon' and look at some of the pictures. You should find pics of Martin G6ABU creating some rather impressive lightnin; /archives//html/Amps/2010-01/msg00603.html (8,494 bytes)
97. Re: [Amps] HB amps (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Mon, 1 Feb 2010 12:51:35 +0100; Personally I think that half the fun is finding and re-using junk second-hand components and designing an amp around them. I never realised that vacuum capacitors actually cost that much new, but whe; /archives//html/Amps/2010-02/msg00003.html (11,756 bytes)
98. Re: [Amps] POTENTIAL BUILDERS (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Mon, 1 Feb 2010 15:06:34 +0100; You underestimate yourself, Charles! You only need simple tools, some books like the late W6SAI's Radio Handbook, the www and the group of experts on this list. The most complex tool you need is admi; /archives//html/Amps/2010-02/msg00007.html (7,938 bytes)
99. Re: [Amps] why did Heath die? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Mon, 1 Feb 2010 15:06:45 +0100; I also wonder if there are fewer 'elmers' around these days and as such we're slowly losing the culture of building stuff. There should be no excuse for this in the days of this new-fangled interweb; /archives//html/Amps/2010-02/msg00008.html (21,238 bytes)
100. Re: [Amps] I dont accept answers to why did Heath die? (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Mon, 1 Feb 2010 19:48:38 +0100; I know that there's huge interest in using the K2/K3 as the RF side of an SDR but know very little about it. Julian G4ILO and Ron PE8E could advise further. I think that both are experimenting with b; /archives//html/Amps/2010-02/msg00020.html (8,959 bytes)

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