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References: [ +from:k8ri@rogerhalstead.com: 562 ]

Total 562 documents matching your query.

161. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 10 Mar 2013 14:43:25 -0400
This confuses me a bit. Any medical device, including computer systems used for testing and data collection, plus equipment in the network is rigidly controlled by FDA "validation" which is far more
/archives//html/Amps/2013-03/msg00149.html (10,696 bytes)

162. Re: [Amps] Freescale LDMOS devices / load mismatch survival (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 10 Mar 2013 23:17:43 -0400
Yes I do concur here George; that's an impressive device survivability capability all right! Nevertheless, as an amplifier designer using this device I'd still build-in the aforementioned ancillary s
/archives//html/Amps/2013-03/msg00163.html (13,287 bytes)

163. Re: [Amps] Unique Henry Classic VHF console amps on QTH (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 11 Mar 2013 01:18:47 -0400
Tempo 3002A Output Filter, and Tempo 3006A Output Filter Are those the coiled up coax stubs? If so, I believe they were used with the table top 2002 and 2006 amps that used a single 3CX800. 73 Roger
/archives//html/Amps/2013-03/msg00165.html (9,641 bytes)

164. Re: [Amps] What Old Amp to Buy? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 12 Mar 2013 15:52:46 -0400
Dentron is a nice choice. Others would be Ameritron AL-82, Kenwood TL-922, and Drake L-7. I am currently running a Kenwood TL-922, Alpha 91B, and an Ameritron ALS-600. I am trading the Ameritron for
/archives//html/Amps/2013-03/msg00190.html (8,933 bytes)

165. Re: [Amps] Coupling a blower to an air system socket (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 15 Mar 2013 22:36:40 -0400
On 3/15/2013 10:09 PM, Bill Fuqua wrote: I believe the air system socket connected to a duct is especially useful when you can't have a pressurized cabinet. There are situations where large cabinets
/archives//html/Amps/2013-03/msg00216.html (11,091 bytes)

166. Re: [Amps] Coupling a blower to an air system socket (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 17 Mar 2013 02:03:07 -0400
On 3/16/2013 11:10 PM, Paul Hewitt wrote: Greetings Ian Besides the lower back pressure advantage of blowing into the anode compartment, this method also cools the tank components. This helps reduce
/archives//html/Amps/2013-03/msg00230.html (21,717 bytes)

167. Re: [Amps] Coupling a blower to an air system socket (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 17 Mar 2013 15:37:50 -0400
On 3/17/2013 4:05 AM, Ian White wrote: On 3/16/2013 11:10 PM, Paul Hewitt wrote: Greetings Ian Besides the lower back pressure advantage of blowing into the anode compartment, this method also cools
/archives//html/Amps/2013-03/msg00237.html (15,194 bytes)

168. Re: [Amps] Coupling a blower to an air system socket (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 18 Mar 2013 11:51:24 -0400
One thing to remember about external anode tubes. They often have cooling requirements listed as so many cfm at a given back pressure, I do not know of any way to achieve the required air flow at a
/archives//html/Amps/2013-03/msg00247.html (12,726 bytes)

169. Re: [Amps] SB-230 Power Question (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 19 Mar 2013 11:21:09 -0400
Its been a very long time since I owned an SB230 (bout 30-35 years, but IIRC this is pretty much typical. 73 Roger (K8RI) I recently acquired a SB-230 thinking the tube was probably bad with an idea
/archives//html/Amps/2013-03/msg00254.html (8,145 bytes)

170. Re: [Amps] BURNING IN A TUBE (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 23 Mar 2013 19:14:09 -0400
Anything beyond three hours and it's a gamble. Isn't that why you carry spares? Or is that due to optimism? Imagination? 73 Roger (K8RI) Don W4DNR _______________________________________________ Amps
/archives//html/Amps/2013-03/msg00315.html (9,013 bytes)

171. Re: [Amps] 8650AS Grounded Grid (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 25 Mar 2013 16:14:17 -0400
If you have the BeO2 block, it's easy to machine a solid anode block to match for the GI-7B 73 Roger (K8RI) The Russian GI-7b and GI-7bT tubes work well in the SB-230. However, they do require a fan
/archives//html/Amps/2013-03/msg00330.html (8,703 bytes)

172. Re: [Amps] 8650AS Grounded Grid (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 25 Mar 2013 19:18:54 -0400
On 3/25/2013 4:52 PM, Glen Zook wrote: The cooler on the GI-7b and GI-7bT come off easily. A metal cooling block could also be made that corresponds with the size of the one on the 8873. Just don't f
/archives//html/Amps/2013-03/msg00332.html (9,305 bytes)

173. Re: [Amps] Getting a blower out of the shack (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 09 Apr 2013 18:19:22 -0400
On 4/9/2013 5:14 PM, Rick Stealey wrote: I have a homebrew amp with a blower mounted on the back of the chassis. The blower has a flat flange, and the chassis has a rectangular hole cut in it to matc
/archives//html/Amps/2013-04/msg00038.html (8,640 bytes)

174. Re: [Amps] Need help with switch nomenclature (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 25 Apr 2013 15:28:53 -0700
Way back in my foggy memory somewhere, I remember using and amplifier made by B & W. I think it was a "Model 1500", but I'm not sure. It used a pair of 813's. What I remember as unique about this amp
/archives//html/Amps/2013-04/msg00214.html (8,695 bytes)

175. Re: [Amps] 572b (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 02 May 2013 19:14:16 -0700
On 5/2/2013 3:32 PM, MU 4CX250B wrote: I'm afraid I don't understand why the plate dissipation would affect longevity, provided the tubes have adequate cooling. Exceeding rated grid current or plate
/archives//html/Amps/2013-05/msg00026.html (9,504 bytes)

176. Re: [Amps] Pre-Distortion Linearizer (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 04 May 2013 02:05:02 -0700
Tom W0IVJ On 5/3/2013 8:39 PM, Leigh Turner wrote: That's right Bob, complex indeed. Such linearization and intermodulation distortion correction techniques are not the panacea they might first seem;
/archives//html/Amps/2013-05/msg00059.html (13,216 bytes)

177. Re: [Amps] chassis maker? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 04 May 2013 02:40:20 -0700
On 5/3/2013 8:39 PM, pulsarxp@embarqmail.com wrote: I think what Dick had in mind was a company similar to the one Charles Byers owned and ran. That is, a small metal shop where one could have a thic
/archives//html/Amps/2013-05/msg00060.html (12,559 bytes)

178. Re: [Amps] Pre-Distortion Linearizer (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 04 May 2013 12:11:09 -0700
It seems to me that many of the newer transceivers have receiver sections that are getting pretty good. If their less than 20 over and you hear splatter you can be pretty sure it's them and not your
/archives//html/Amps/2013-05/msg00074.html (8,850 bytes)

179. Re: [Amps] chassis maker? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 04 May 2013 13:04:36 -0700
On 5/4/2013 7:02 AM, Colin Lamb wrote: It is not too difficult to build your own chassis. Laying out the metal (with all the required ears) is the most demanding part. A shear is not necessary. Cutti
/archives//html/Amps/2013-05/msg00075.html (11,584 bytes)

180. Re: [Amps] chassis maker? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 04 May 2013 13:08:43 -0700
Colin, The aeroplane is likely to be less forgiving of poor riveting than a chassis, though! There are a number of kits on the market that use pop rivets now...Cherry pop rivers.<:-)) These are typic
/archives//html/Amps/2013-05/msg00076.html (9,988 bytes)

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