Mail Archive Search: <+from:jono@webspun.com>

Results:

References: [ +from:jono@webspun.com: 231 ]

Total 231 documents matching your query.

121. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 10:03:31 -0500; Hmm...read again, Tom. I think my failure WAS a parasitic of some sort. To make a 3 watt, 1 Ohm metal film resistor fail, one would need several amps of current. To make a parallel combination of a; /archives//html/Amps/1998-05/msg00561.html (12,532 bytes)
122. [AMPS] More amplifier experiments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 10:19:02 -0500; Ok, I confess...my lack of tube design experience is becoming real evident to me! I might know something about RF, but the 4-1000A does seem to be an animal..... Yesterday I did some additional exper; /archives//html/Amps/1998-05/msg00562.html (9,921 bytes)
123. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 10:44:01 -0500; Well, given I don't have an MFJ-259, that would be difficult. My thought was to place a cap in parallel with the resistor and then measure the resonance with a dip meter. From there, one can calcula; /archives//html/Amps/1998-05/msg00564.html (9,404 bytes)
124. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 22:40:31 -0500; [snip] Why would a gassy tube cause a resistor combination that should be able to carry several amperes of current to pop like a firecracker? Also, there is no blue glow of any kind whatsoever in th; /archives//html/Amps/1998-05/msg00574.html (14,309 bytes)
125. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 22:45:28 -0500; They fell out of the mainstream because better equipment came along. It's not that they didn't tell an accurate picture. A slotted line can give you a great reading of SWR but a network analyzer wil; /archives//html/Amps/1998-05/msg00575.html (9,594 bytes)
126. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 26 May 98 14:00:53 -0500; Interesting. Why would the tube suddenly arc when I was testing it on 15 meters while it was fine when I had tested it all day on 10 meters? Is the tube still usable or should I send it back to the; /archives//html/Amps/1998-05/msg00581.html (12,132 bytes)
127. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 26 May 98 22:59:49 -0500; What do you call a proper fault protection resistor? I did have two 10 watt 10 Ohm wirewounds in series right after the HV DC bypass caps at the DC entrance point to the RF deck. They opened up duri; /archives//html/Amps/1998-05/msg00583.html (10,292 bytes)
128. [AMPS] Amplifier Layout Techniques: Positioning of Filament xfrmr (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 26 May 98 23:04:25 -0500; Hi all, OK, here's another question for you amp gurus who have built several tube amps. I would like to move my 4-1000 tube farther back into my RF cabinet. The reason for this is that I would then s; /archives//html/Amps/1998-05/msg00584.html (8,037 bytes)
129. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 27 May 98 09:25:45 -0500; So do I feed a small signal into the resistor/diode pair? And how does measuring voltage drop across a resistance help me to calculate impedance? If I have a known resistance and a known voltage, I; /archives//html/Amps/1998-05/msg00587.html (9,583 bytes)
130. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 27 May 98 11:36:57 -0500; Good point. Ur right. Maybe I'll just give them to a buddy of mine who's got access to a network analyzer. That would work a lot more accurately. 73, Jon KE9NA -- Jon Ogden jono@webspun.com www.qsl.; /archives//html/Amps/1998-05/msg00592.html (8,333 bytes)
131. [AMPS] More amplifier experiments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 27 May 98 11:44:19 -0500; Yes, I know. I've been considering ordering some. Are metal oxide and metal film resistors different? I haven't used any carbons for some time. I've been considering looking into getting some fairly; /archives//html/Amps/1998-05/msg00593.html (10,683 bytes)
132. [AMPS] Triode Amp Out/In isolation (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 28 May 98 00:00:46 -0500; Sounds awfully low in general for S12, but I know in a GG amp, part of the driving power shows up at the output. So, I would assume that if part of the input power shows up at the output, then your; /archives//html/Amps/1998-05/msg00598.html (9,123 bytes)
133. [AMPS] Triode Amp Out/In isolation (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 28 May 98 09:05:36 -0500; Not that I know of unless you have a vector voltmeter. You can find them at hamfests, etc. They work pretty well. 73, Jon KE9NA -- Jon Ogden jono@webspun.com www.qsl.net/ke9na "A life lived in fear; /archives//html/Amps/1998-05/msg00606.html (8,911 bytes)
134. [AMPS] More amplifier experiments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 28 May 98 15:54:32 -0500; AG6K recommends this as part of his 4-1000A supressor kit. Got them in mine. 73, Jon KE9NA -- Jon Ogden jono@webspun.com www.qsl.net/ke9na "A life lived in fear is a life half lived." -- FAQ on WWW:; /archives//html/Amps/1998-05/msg00616.html (9,516 bytes)
135. [AMPS] Re: your mail (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 28 May 98 23:46:37 -0500; GE still uses tube amps. I forget who manufactures them for GE. The only assembly done at their MRI facility is final system assembly. So I don't know where tube testing is done. They were looking a; /archives//html/Amps/1998-05/msg00625.html (8,148 bytes)
136. [AMPS] 8877 pulls (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 28 May 98 23:47:43 -0500; The medical manufacturer in Cleveland is Picker. They compete with GE in MRI, so I would assume those would be MRI pulls too. 73, Jon KE9NA -- Jon Ogden KE9NA http://www.qsl.net/ke9na "A life lived; /archives//html/Amps/1998-05/msg00626.html (7,224 bytes)
137. [AMPS] More amplifier experiments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 29 May 98 08:36:08 -0500; I have an SK-510. When you say tube clips, do you mean the clips that contact the tube base and provide ground and tension to hold the tube in place? I have those, yes, but the socket is plastic, so; /archives//html/Amps/1998-05/msg00636.html (9,951 bytes)
138. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 29 May 98 08:55:49 -0500; Of course I could be wrong too. NMR I thought was used more for material research while MRI was more for diagnosis of human patients. Picker is another MRI manufacturer. The strength of the amp depe; /archives//html/Amps/1998-05/msg00637.html (9,367 bytes)
139. [AMPS] More amplifier experiments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 29 May 98 09:43:50 -0500; I would say if 60 nH is accurate, that could have quite an effect on the overall supressor design. The reason is that the supressor coil itself is in the 60 to 100 nH range. So in effect you have 2; /archives//html/Amps/1998-05/msg00639.html (10,130 bytes)
140. [AMPS] More amplifier experiments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 29 May 98 10:07:18 -0500; IMHO, an inductive resistor here does not matter. For one, there should be little to no RF at this point in the circuit. Two, it's in series with an inductor and three I think the transient response; /archives//html/Amps/1998-05/msg00641.html (9,997 bytes)

Current List: 121 - 140
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]