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References: [ +from:K8RI@rogerhalstead.com: 562 ]

Total 562 documents matching your query.

141. Re: [Amps] 300 W single band mobile amp needed (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 08 Oct 2012 01:38:21 -0400
Very well could<:-)) OTOH at my age I'll use any excuse I can find. 73 Roger (K8RI) OTOH many of us have hundreds of hours total using the HTs with the antenna right next to our heads. 73 Roger (K8RI
/archives//html/Amps/2012-10/msg00057.html (9,376 bytes)

142. Re: [Amps] 300 W single band mobile amp needed (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 08 Oct 2012 16:23:29 -0400
With the antenna almost making direct contact as most people use them it doesn't have to. Using the inverse square law, making direct contact on 2-meters is probably more RF exposure than 300 watts i
/archives//html/Amps/2012-10/msg00065.html (11,410 bytes)

143. Re: [Amps] HV Insulators (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 15 Oct 2012 14:35:22 -0400
It varies, but I see quite a few ceramic stand offs on e-bay from time to time and a wide range of sizes. PVC will also work. 73 73, George W2GS _______________________________________________ Amps m
/archives//html/Amps/2012-10/msg00094.html (7,817 bytes)

144. Re: [Amps] Question re GU-74B grid current (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 23 Oct 2012 04:00:26 -0400
What a line of.... I bet the 4CX1600 was the best thing going too? Now that they are TOTALLY not available anymore. From what I've read the 4CX1600B really was an excellent tube. I think Carl has exp
/archives//html/Amps/2012-10/msg00123.html (17,237 bytes)

145. Re: [Amps] The GU84B and GU78B tubes / some brief history (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 29 Oct 2012 15:31:52 -0400
I remember two different models from B&W. One was the standard 850A(?) with a "stepped" coil. A lower frequency portion of about #8 wire, (80 and 40m) followed by something on the order of 1/4 " or 5
/archives//html/Amps/2012-10/msg00208.html (12,864 bytes)

146. Re: [Amps] Alpha 76 switches and caps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 30 Oct 2012 00:14:37 -0400
On 10/29/2012 11:09 PM, Bob K6UJ wrote: I need to replace the two side by side switches and the plastic push buttons for ON/OFF on my Alpha 76CA. A number of Alpha amps use the same switches, Alpha 7
/archives//html/Amps/2012-10/msg00212.html (7,424 bytes)

147. Re: [Amps] Mounting Plate for a 3CX3000A7 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 31 Dec 2012 22:02:11 -0500
There are a number available on e-bay for a wide range of prices 73 Roger (K8RI) Ed, KB5GT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti
/archives//html/Amps/2013-01/msg00001.html (7,760 bytes)

148. Re: [Amps] New 4-1000 Tubes ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 07 Jan 2013 10:25:03 -0500
Probably because the manufacturers data sheet de-rates the GU-81 rapidly as you go up in frequency. Few home brewers OTOH run them within their ratings. According to builders in Europe they run 3 KW
/archives//html/Amps/2013-01/msg00059.html (9,342 bytes)

149. Re: [Amps] 50v power supply options for SS amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 03 Feb 2013 20:05:17 -0500
My sense is that you are better of buying a used 50v supply from the telco equipment industry than you are trying to build one. I especially like the Valere rectifiers, like this one: http://www.ebay
/archives//html/Amps/2013-02/msg00025.html (8,662 bytes)

150. Re: [Amps] Peter Dahl Transformers (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 19 Feb 2013 16:36:40 -0500
On 2/16/2013 7:40 AM, Jim Thomson wrote: Date: Thu, 14 Feb 2013 10:59:08 -0600 From: Rob Atkinson <ranchorobbo@gmail.com> To: Bill Turner <dezrat1242@yahoo.com> Cc: Amps <amps@contesting.com> Subject
/archives//html/Amps/2013-02/msg00146.html (11,102 bytes)

151. Re: [Amps] FW: 4CX1000 removal - Disregard (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 19 Feb 2013 16:41:35 -0500
Although you've solved the problem I though I'd throw this out in case some one else might have this problem. Try one of the thin rubber disks used to get a better grip when opening jars with the sc
/archives//html/Amps/2013-02/msg00147.html (8,313 bytes)

152. Re: [Amps] Peter Dahl Transformers (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 21 Feb 2013 13:29:22 -0500
inside the cab should be the same as the room temp. It?s worth it to keep the plate xfmr, hv electrolytics, bleeders, eq resistors, and any glitch resistor cool. I use filters that are like a very f
/archives//html/Amps/2013-02/msg00185.html (10,618 bytes)

153. Re: [Amps] reasonable design (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 23 Feb 2013 01:18:56 -0500
On 2/21/2013 4:04 PM, John Lyles wrote: I have followed recent threads that go back and forth about cooling transformers and use of switch mode technology for HV. I have two practical examples that I
/archives//html/Amps/2013-02/msg00203.html (8,304 bytes)

154. Re: [Amps] Peter Dahl transformers (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 23 Feb 2013 01:04:24 -0500
On 2/21/2013 11:47 AM, Vic K2VCO wrote: This is so true! I am now the local expert in fixing computer monitors that failed because the small capacitors in the switching supply that powers the backlig
/archives//html/Amps/2013-02/msg00210.html (9,345 bytes)

155. Re: [Amps] 813 efficiency (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 23 Feb 2013 15:44:26 -0500
Might be incentive for those remaining to learn at least basic electronics...Nah, this is the entitlement generation. The survivors would expect the electrons to learn their lesson and the family wou
/archives//html/Amps/2013-02/msg00219.html (11,005 bytes)

156. Re: [Amps] 813 efficiency (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 25 Feb 2013 11:31:47 -0500
It absolutely gobsmacks me how some guys in this hobby would rather whip-out the ol' VISA card & spend literally HUNDREDS on power amplifier tubes, when the lowly ol' 813--paired with some twins, of
/archives//html/Amps/2013-02/msg00230.html (10,649 bytes)

157. Re: [Amps] FW:  Power factor correction on tube amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 09 Mar 2013 14:05:02 -0500
Jim wrote: So -- since SPE amps are made in Italy, an EU country, there's a good chance that they are compliant with EU regulations. Or maybe not. :)< The link posted to the site of Bob, G4UJS (http:
/archives//html/Amps/2013-03/msg00113.html (11,148 bytes)

158. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 09 Mar 2013 18:34:36 -0500
That is an indication that the people trying for certification didn't really understand the ISO requirements. It is purely about documentation, nothing more and nothing less. I found that most compan
/archives//html/Amps/2013-03/msg00121.html (9,941 bytes)

159. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 09 Mar 2013 19:21:24 -0500
Strictly, ISO 9000 registartion means that you have the paperwork and the parts should meet the spec. Once you put self -certification to a published Harmonised Standard in the loop, it should, in th
/archives//html/Amps/2013-03/msg00123.html (9,623 bytes)

160. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 10 Mar 2013 00:30:54 -0500
On 3/9/2013 8:01 PM, George wrote: Roger, as ISO9001 goes, if you write it, you follow it! I remember going through the certification process and questioning the legitimacy of a policy that allows fo
/archives//html/Amps/2013-03/msg00130.html (13,122 bytes)

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