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Total 216 documents matching your query.

161. Re: [Amps] Tubes, made in the USA, in the olden days; Films? (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Tue, 31 Aug 2010 18:22:01 +0000 (GMT)
Thanks Mike.  FWIW that book came courtesy of the Weinheim VHF fleamarket meeting in Germany about 10 years ago.  For once I'm glad I'm a squirrel!  Hope it's useful. cheersDave G0OIL The 6 files are
/archives//html/Amps/2010-08/msg00493.html (9,958 bytes)

162. Re: [Amps] vacuum variable caps (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Mon, 6 Sep 2010 18:43:21 +0000 (GMT)
Hi Mike - just a case of convenience versus complexity really.   If you ground the shaft side you just have to isolate from ground and design for RF 'live" around one simple connection.  If you groun
/archives//html/Amps/2010-09/msg00030.html (7,703 bytes)

163. Re: [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Mon, 13 Sep 2010 16:46:28 +0000 (GMT)
"The Engineering Council in the UK would I expect strip someone of  their CEng status if an individual proposed such silly things." But let's face it, the UK is becoming just about the most laughable
/archives//html/Amps/2010-09/msg00144.html (10,861 bytes)

164. Re: [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Mon, 13 Sep 2010 18:46:46 +0000 (GMT)
Well, Bill ..... what I build for myself and my design philosophy here at home, armed as I am with (a) my belief in my own capability, (b) my attitude to risk to myself and (c) a sensible and proport
/archives//html/Amps/2010-09/msg00150.html (10,990 bytes)

165. Re: [Amps] Sourcing Sheet Aluminum (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Wed, 15 Sep 2010 18:19:50 +0000 (GMT)
For those in England, A.S.C. Metals in Lincoln are a good source of cheap-ish offcuts. They have sheet materials and aluminium angle and tubing.  It's possible to get things a lot cheaper cash in han
/archives//html/Amps/2010-09/msg00190.html (11,770 bytes)

166. Re: [Amps] What aluminum alloy to use for making PSU and RF deck (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Thu, 16 Sep 2010 06:11:50 +0000 (GMT)
Dave, you describe the well-known phenomenon of "Rip-off Britain".  It exists because most Brits are stupid enough to just pay up rather than shop around, hence both the government and businesses get
/archives//html/Amps/2010-09/msg00200.html (10,619 bytes)

167. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Mon, 27 Sep 2010 08:04:07 +0000 (GMT)
The GU81Ms do indeed have a good reputation here in Europe as being a tube that can withstand fearful abuse.  They keep on working long after they should have melted.  I bought a load of these things
/archives//html/Amps/2010-09/msg00318.html (11,028 bytes)

168. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Mon, 27 Sep 2010 09:36:56 +0000 (GMT)
Hi Alek - yes, I think that for the "real radio that glows in the dark" the GU81M would take some beating.  I did toy with the idea of using the 'glass'-plus-screen from a microwave oven door as part
/archives//html/Amps/2010-09/msg00320.html (14,107 bytes)

169. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Mon, 27 Sep 2010 14:06:34 +0000 (GMT)
Who's on first, Whats on second, etc. You ever hear that routine by Abbott and Costello Dave? Carl Hi Carl, yes, absolute classic - I'd not heard it in years, but found it here:  http://www.youtube.c
/archives//html/Amps/2010-09/msg00324.html (8,295 bytes)

170. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Tue, 28 Sep 2010 08:13:09 +0000 (GMT)
Well I'm just delighted to see that potentially someone ELSE is keeping up consumer spending to help us out of the downturn .... because I'm certainly not Dave G0OIL $10,500 for a 5-input passive att
/archives//html/Amps/2010-09/msg00339.html (9,053 bytes)

171. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Thu, 30 Sep 2010 18:31:39 +0000 (GMT)
Lets hope he doesn't develop any feline incontinence .... <zap> .. MRRROOOWL! That is one handsome puddytat Dave G0OIL Watch out for that cat-in-the-lap. It can be painful.  My old "used to be" tomca
/archives//html/Amps/2010-09/msg00367.html (11,243 bytes)

172. Re: [Amps] Any experiences with "powergridtube"? (YC156 hunt) (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Thu, 30 Sep 2010 19:00:26 +0000 (GMT)
I've not come across that seller before.  Does he mean $550 per tube?  Also he's stated that you may not get the one in the advertisement, so although the picture is of a new looking one, you may get
/archives//html/Amps/2010-09/msg00368.html (9,829 bytes)

173. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Tue, 26 Oct 2010 07:39:23 +0100 (BST)
Interesting.  So I guess the question is "why?" Why would powdered metal work better?  Is it more lossy at HF? cheers Dave G0OIL For what it's worth - I have found ferrites to be all but useless at H
/archives//html/Amps/2010-10/msg00372.html (8,445 bytes)

174. Re: [Amps] Transformers (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Fri, 29 Oct 2010 17:38:52 +0100 (BST)
I think I've heard good reports about those guys. This bunch are pretty reasonable too http://www.jmsonline.co.uk/index.php?cPath=22&sort=2a&page=1 I collected a 20kva transformer for a friend from J
/archives//html/Amps/2010-10/msg00429.html (7,799 bytes)

175. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Tue, 9 Nov 2010 06:42:44 +0000 (GMT)
it all sounds a little QRP to me.  Ever seen some of the Russian contest stations? Dave G0OIL You are right Jim. But as I know, the most  buyers of  Emtron DX2-5, OM2500/3500 and THP HL5KFX are  cont
/archives//html/Amps/2010-11/msg00073.html (13,313 bytes)

176. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Dave White <mausoptik@btinternet.com>
Date: Tue, 9 Nov 2010 08:24:00 +0000
Yes, I remember once speaking to one of the Russian gang after one of the major contests and told him how loud they were. He explained that the main PA had failed and that they'd had to run the remai
/archives//html/Amps/2010-11/msg00076.html (8,874 bytes)

177. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Dave White <mausoptik@btinternet.com>
Date: Tue, 9 Nov 2010 14:48:03 +0000
That sounds a bit like handing out speeding tickets at the Indy 500 to me... Dave G0OIL Not following the rules. 73 Jim W7RY _______________________________________________ Amps mailing list Amps@con
/archives//html/Amps/2010-11/msg00085.html (8,948 bytes)

178. Re: [Amps] Tube Cooling.. (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Tue, 23 Nov 2010 20:28:52 +0000 (GMT)
As Bob VK3ZL stated, the coolers don't look like the many thin fins of the Eimac tubes but they seem to work well if you blow forced air (25cfm+) onto/through them vertically (assuming a vertical tub
/archives//html/Amps/2010-11/msg00404.html (12,425 bytes)

179. Re: [Amps] 5CX1500 socket ( changed subject ) (score: 1)
Author: DAVE WHITE <mausoptik@btinternet.com>
Date: Wed, 15 Dec 2010 21:42:11 +0000 (GMT)
My memory may fail me here (RF damage, perhaps) but I seem to remember Bob G4UJS tried building an amp with a 5CX1500 some years ago, but had problems with stability.  I'm not sure if he ever got to
/archives//html/Amps/2010-12/msg00168.html (9,730 bytes)

180. Re: [Amps] 4-1000 Bias (score: 1)
Author: Dave White <mausoptik@btinternet.com>
Date: Thu, 3 Mar 2011 08:04:50 +0000
Cheers Dave G0OIL I have a 4-1000 g-g homebrew amp. It was designed 4000 volts on the plate. My new supply is 5500 volts under load. With the grid at ground potential and at 4000 volts on the plate
/archives//html/Amps/2011-03/msg00034.html (8,665 bytes)

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