- 121. Re: [Amps] SB220 "A" mods (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 31 Mar 2008 14:49:34 -0400
- I don't go quite that cheap, but with a pair of active speakers on three of the computers in the house, Two computers are with in 4' of my station including the not gold plated, old, used Alpha 76 an
- /archives//html/Amps/2008-03/msg00389.html (12,352 bytes)
- 122. Re: [Amps] SB220 "A" Mods (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 31 Mar 2008 22:45:40 -0400
- I thought you were talking about the "Gold" Bencher presentation model. It was only about half the price of that "Mercury" model as was the Vibroplex Gold Presentation. <:-)) 73 Roger (K8RI) ________
- /archives//html/Amps/2008-03/msg00397.html (9,383 bytes)
- 123. Re: [Amps] Relays (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Wed, 02 Apr 2008 13:46:27 -0400
- My first transmitter was a pair of 6L6s stuck in the corner of one of a huge, steel TV chassis. It eventually ended up with either a 12AT7 or 12AX7 as a TR switch. (Novice running QSK<g>) When I move
- /archives//html/Amps/2008-04/msg00039.html (9,540 bytes)
- 124. Re: [Amps] Replacing 811A with 572B (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Wed, 09 Apr 2008 22:35:53 -0400
- Waste? When compared to most tubes in the 1KW to legal limit either the 811 or 572s are down right inexpensive. OTOH the 572s are much more rugged and tolerant. They should run until they die of old
- /archives//html/Amps/2008-04/msg00127.html (10,515 bytes)
- 125. Re: [Amps] 3CX3000A7 input impedance (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 21 Apr 2008 13:49:37 -0400
- I don't get the PW request, but the image is corrupted. I only see about the top 1/2" of the tube image. I've tried a number of times over the past few days using a LINUX based machine. It downloaded
- /archives//html/Amps/2008-04/msg00254.html (9,720 bytes)
- 126. Re: [Amps] Dentron DTR 2000L Linear (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Wed, 23 Apr 2008 14:28:20 -0400
- I had one back when they first came out. It worked well. I only had one problem with it. A low voltage cap exploded. The jacket blew off in one piece and hit the top of the cabinet. It looked like a
- /archives//html/Amps/2008-04/msg00274.html (8,075 bytes)
- 127. Re: [Amps] Chimney for GS-31B (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Thu, 01 May 2008 13:46:51 -0400
- Try using some silicone caulk such as clear bathtub or the stuff they used to seal glass aquariums. Silicone rubber works great. Alpha uses it in their big amps. Cut a sheet, roll up to fit the outsi
- /archives//html/Amps/2008-05/msg00003.html (8,287 bytes)
- 128. Re: [Amps] Chimney for GS-31B (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Thu, 01 May 2008 22:45:48 -0400
- Other wise the silicone rubber might be available through automotive stores. It is available through aviation parts suppliers. It's the same stuff they use for engine heat baffles. Might be a tad exp
- /archives//html/Amps/2008-05/msg00006.html (9,220 bytes)
- 129. Re: [Amps] Chimney for GS-31B (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Fri, 02 May 2008 14:03:20 -0400
- Don't forget to take into account the mounting of the tube and whether it needs cooling or not. I looked but couldn't find a data sheet on the GS-31B, but looking at the photo of the tube I wonder if
- /archives//html/Amps/2008-05/msg00009.html (12,997 bytes)
- 130. Re: [Amps] transformer in series......... (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Tue, 13 May 2008 14:30:46 -0400
- You're right. I didn't catch the "autotransformer part. Auto transformers should not be connected in series. Roger (K8RI) _______________________________________________ Amps mailing list Amps@contes
- /archives//html/Amps/2008-05/msg00094.html (8,538 bytes)
- 131. Re: [Amps] liquid cooled Amplifier coolant recommendations (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Fri, 16 May 2008 15:17:41 -0400
- I used and have worked with water cooled amps and oscillators for years. We used De Ionized (DI) water for years with systems up to multi-hundred KW. Either DI or distilled water should work fine. Mo
- /archives//html/Amps/2008-05/msg00112.html (10,845 bytes)
- 132. Re: [Amps] liquid cooled Amplifier coolant recommendations (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Fri, 16 May 2008 20:53:27 -0400
- Some how this ended up in my "Drafts" folder after I started it early today and I just got back to it so I'll address a couple other posts. True, but just sticking in probes is only going to give a r
- /archives//html/Amps/2008-05/msg00116.html (15,475 bytes)
- 133. Re: [Amps] New Amps at Dayton (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Tue, 20 May 2008 18:03:08 -0400
- The same 4CX-1000A used in the 30-S1? The one with zero grid dissipation? That's the tube I've always said I'd never use in anything because it's so fragile or have I missed something? Isn't that qui
- /archives//html/Amps/2008-05/msg00137.html (10,435 bytes)
- 134. Re: [Amps] New Amps at Dayton (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Tue, 20 May 2008 19:29:52 -0400
- That makes sense. The ones I had must have been the A version as they used a conventional type socket. It's been almost 20 years which is a good memory test. Now if we could still get the 4CX1600B wh
- /archives//html/Amps/2008-05/msg00141.html (9,395 bytes)
- 135. Re: [Amps] Alpha 8410 (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Wed, 21 May 2008 02:32:33 -0400
- Actually, I purchased a brand new Bonneville convertible in late 61 (62 model) for $3,600. Real leather interior along with all the bells and whistles. Weighed nearly three tons. (a tad shy of 6000#)
- /archives//html/Amps/2008-05/msg00150.html (9,485 bytes)
- 136. Re: [Amps] Higher power transmitting tubes for "portable" amps. (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Wed, 21 May 2008 18:55:05 -0400
- I believe there was an article a few years back about a complete portable amp using the 8877. The PS was a built in switching unit. IIRC the whole thing weighed less than 30#. I like the 8877. They a
- /archives//html/Amps/2008-05/msg00157.html (8,175 bytes)
- 137. Re: [Amps] AMP TUBES (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Wed, 21 May 2008 22:16:06 -0400
- Basically Eimac has dropped the 3CX 400 and 800 series although they do have a 3CPX800 which Henry Radio used in one of their VHF amps although I can no longer find a listing of it. http://www.cpii.c
- /archives//html/Amps/2008-05/msg00160.html (8,332 bytes)
- 138. Re: [Amps] AMP TUBES (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Thu, 22 May 2008 02:12:48 -0400
- The tubes are apparently still available in quantity, but whether they are still being manufactured or not? I like the 3CX and 4CX 800's, as they are a known quantity when it comes to parting with an
- /archives//html/Amps/2008-05/msg00162.html (9,423 bytes)
- 139. Re: [Amps] Tokyo Hy-Power HL-2.5K (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 26 May 2008 01:23:03 -0400
- Which was the only reason I opted for the 1.5K-fx instead of waiting a couple of months for the 2.5. Unfortunately the 7L Yagi at 115 feet has been ailing (boom truss broke and dropped down onto the
- /archives//html/Amps/2008-05/msg00186.html (9,913 bytes)
- 140. Re: [Amps] 3-500 availability (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 26 May 2008 03:11:58 -0400
- As widely used, it's basically the top selling tube, it relatively inexpensive for the power level, and has a well established market I'd expect to see it around for a while. OTOH I was wrong one oth
- /archives//html/Amps/2008-05/msg00188.html (7,148 bytes)
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