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References: [ +from:vic@rakefet.com: 418 ]

Total 418 documents matching your query.

141. Re: [Amps] 5.0V FILAMENT IS ONLY 2.5V (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 06 Jul 2005 15:27:13 -0700
It is obviously wired incorrectly now, or something is seriously wrong. Without knowing the type of amplifier (make/model, homebrew) it's impossible to give you advice about what to do. Even then, yo
/archives//html/Amps/2005-07/msg00038.html (7,920 bytes)

142. Re: [Amps] Tetrodes (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Tue, 12 Jul 2005 09:00:03 -0700
Which seems to imply that when putting a tube in service that has been stored for some time, the way to activate the getter depends on the tube type. Filament voltage alone should work for a ceramic
/archives//html/Amps/2005-07/msg00119.html (8,365 bytes)

143. Re: [Amps] Alpha 86 PIN Diode Fuse (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Thu, 14 Jul 2005 10:49:20 -0700
This is strange. I had an 86 for a couple of years, used it a lot -- always full QSK at at least 1300 watts output on all bands, and NEVER blew the fuse. Yet some guys have continual problems with th
/archives//html/Amps/2005-07/msg00155.html (7,049 bytes)

144. Re: [Amps] Alpha 86 PIN Diode Fuse (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Thu, 14 Jul 2005 13:14:41 -0700
Here in Central CA, we don't have many -- and my antenna and power leads come through a single-point entry with ICE protectors on them. One possibility. Another is that I drove the 86 with either an
/archives//html/Amps/2005-07/msg00159.html (7,784 bytes)

145. Re: [Amps] Wrong Business (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 05 Aug 2005 08:29:10 -0700
I'm going to quote just one bit from this website. I could have chosen almost any part of it, but the absurdity of this one struck me: "The amps rubber feet might be OK on hard surfaces, but they all
/archives//html/Amps/2005-08/msg00174.html (9,327 bytes)

146. Re: [Amps] RF Parts OEM 3-500ZG's (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sun, 07 Aug 2005 22:19:42 -0700
Anecdotal evidence is that these tubes are excellent, and in fact better than later Eimac tubes which had weld problems. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _________________________
/archives//html/Amps/2005-08/msg00278.html (7,445 bytes)

147. Re: [Amps] 2nd grid resistor blow Ameritron AMP 811H (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 15 Aug 2005 10:47:49 -0700
I doubt that this problem is caused by a parasitic. I certainly would not make a categorical statement like 'you are getting a parasitic oscillation...'. It sounds like, more than anything else, a tu
/archives//html/Amps/2005-08/msg00532.html (7,585 bytes)

148. Re: [Amps] Question on Step Start Relays (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 17 Aug 2005 19:54:36 -0700
Yes, they are quite sensitive to RF. In my case, I found that RF tended to turn them off. I added a pi filter to the control circuit, but it didn't help much. Finally, I wrapped some no. 12 wire arou
/archives//html/Amps/2005-08/msg00585.html (7,185 bytes)

149. Re: [Amps] Amp Question (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 22 Aug 2005 07:48:08 -0700
Elecraft is very shortly (a few months) going to release its KPA800 which has that capability. The initial version will be capable of 800 watts SSB and 1KW CW, and some time later they will release a
/archives//html/Amps/2005-08/msg00653.html (8,108 bytes)

150. Re: [Amps] ps caps (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 22 Aug 2005 09:23:55 -0700
Actually, it's quite possible that they are matched. The voltage across series capacitors will divide unequally depending on the capacity and the leakage resistance. If there are 20% tolerances, this
/archives//html/Amps/2005-08/msg00656.html (9,483 bytes)

151. Re: [Amps] Bias or Plate voltage change (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 01 Sep 2005 09:57:47 -0700
If the bias is beyond cutoff, it will tend to sharpen the edges of keying elements. Depending on how high the bias is and how sharp the keying from the exciter (for example an unmodified FT1000MP is
/archives//html/Amps/2005-09/msg00003.html (7,520 bytes)

152. Re: [Amps] RS-232 (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 18 Sep 2005 06:37:38 -0700
Interesting. I tried to use a USB keyboard with my shack computer, not too far from the base of my 80/160m inverted L. I could not keep RF out of it when running a few hundred watts, even with ferrit
/archives//html/Amps/2005-09/msg00206.html (7,143 bytes)

153. Re: [Amps] Ameritron AL-811H-- Again (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 30 Sep 2005 17:09:14 -0700
It's not junk. It's not a bad design and most of the components are acceptable to good quality. It's likely to be more trouble-free (assuming that it has decent tubes in it) than many 'better' amplif
/archives//html/Amps/2005-09/msg00398.html (8,619 bytes)

154. Re: [Amps] Energy stored in capacitor bank ? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 03 Oct 2005 09:24:41 -0700
What is the advantage of using so much capacitance? For CW or SSB, 30 uf would likely reduce ripple enough. As you point out, the amount of energy stored in your capacitor is enormous, and this energ
/archives//html/Amps/2005-10/msg00088.html (7,727 bytes)

155. Re: [Amps] zink primer (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 13 Oct 2005 21:44:30 -0700
I bought some etching primer for aluminum at a Pep Boys auto store recently. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Amps mailing list Amp
/archives//html/Amps/2005-10/msg00347.html (7,770 bytes)

156. Re: [Amps] Alpha 87A and PROII (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 14 Oct 2005 09:29:26 -0700
Not for sure. Try this with the 850 in CW QSK mode: 1) Adjust the power output control to give you about the amount of drive that you need. 2) Back off the carrier control until the output of the 850
/archives//html/Amps/2005-10/msg00380.html (7,464 bytes)

157. Re: [Amps] Antenna Tuner Overheating (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sat, 15 Oct 2005 19:44:33 -0700
I'm not familiar with these tuners, but if they use the doorknob capacitors with N750 temp. coefficients, I am sure that is the problem. I tried to use these capacitors at only 800 watts in a homebre
/archives//html/Amps/2005-10/msg00420.html (7,144 bytes)

158. Re: [Amps] AL-1200 on AM (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 30 Oct 2005 09:18:04 -0800
Keep in mind (I'm sure Rich knows this, but others might not) that just turning up the ALC pot on the 850 without increasing the voltage can also produce 150 or more watts...with a huge increase in I
/archives//html/Amps/2005-10/msg00695.html (8,090 bytes)

159. Re: [Amps] Meaning of "conduction cooled" (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 03 Nov 2005 08:45:31 -0800
I would say that external anode tubes like the 3Cx800, etc. are convection (or more precisely, forced-air) cooled, while glass-envelope internal anode tubes like the 3-500Z are primarily radiation co
/archives//html/Amps/2005-11/msg00050.html (7,813 bytes)

160. Re: [Amps] Ultimate safety for house wiring (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 18 Nov 2005 09:26:43 -0800
A great idea. If they used 14 MHz then all I'd need is a key and an antenna! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Amps mailing list Amp
/archives//html/Amps/2005-11/msg00310.html (7,333 bytes)

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