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

Total 418 documents matching your query.

241. Re: [Amps] Surge resistor (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 21 Mar 2007 08:27:50 -0700
The 50 ohm surge resistor is designed to reduce the very high current that would occur if there were an arc in the tube as a result of gas, or a 'whisker' on a metallic structure in the tube, for exa
/archives//html/Amps/2007-03/msg00281.html (9,431 bytes)

242. Re: [Amps] TMC amp toroid tank (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 27 Mar 2007 08:30:35 -0700
This made me think that possibly you could make a very compact tank assembly by simply stacking six individual toroids with maybe 1/4" between them. Since so little flux escapes from the cores, they
/archives//html/Amps/2007-03/msg00362.html (8,101 bytes)

243. Re: [Amps] Inadequate load current (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 12 Apr 2007 15:20:19 -0700
Are you sure there's continuity through the link to the dummy load or antenna? It sounds like the stage is operating without a load. Antenna relay? -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vc
/archives//html/Amps/2007-04/msg00099.html (7,101 bytes)

244. Re: [Amps] (Fwd) Amp tube pin/socket de VY1JA (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 15 Apr 2007 08:26:09 -0700
I have seen this problem myself. The problem is that once the pin and the contact start getting hot, the spring loses its temper, which increases the contact resistance, making the problem worse. Ult
/archives//html/Amps/2007-04/msg00129.html (7,905 bytes)

245. Re: [Amps] OT: TVI (was: ceramic capacitor ratings) (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 15 Apr 2007 09:58:01 -0700
I know this is *very* off-topic, but it's a good story. It happened almost 50 years ago. My dad and I were watching the World Series on TV (for non-US guys, this to us was like the World Cup is today
/archives//html/Amps/2007-04/msg00134.html (8,236 bytes)

246. Re: [Amps] Surface Cleaning Tarnished Aluminum (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 24 Apr 2007 08:49:39 -0700
I've done this by taking the capacitor apart and using 400 and 800-grit sandpaper, such as is used for automobile finishing, followed by polishing on a buffing wheel. Although lye will etch aluminum,
/archives//html/Amps/2007-04/msg00250.html (7,118 bytes)

247. Re: [Amps] Sell: Drake L4B parts (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 25 Apr 2007 20:19:40 -0700
But...if it's a working amplifier, why remove parts? Now it won't work. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Amps mailing list Amps@con
/archives//html/Amps/2007-04/msg00309.html (6,855 bytes)

248. Re: [Amps] An inexpensive choke for a resonant filter (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 16 May 2007 08:10:27 -0700
I have one of these and it looks like one side of the secondary is designed to be grounded. So the insulation may be poor at this point. If this is the case with yours, you might think about using it
/archives//html/Amps/2007-05/msg00141.html (8,217 bytes)

249. Re: [Amps] Jennings and Kilovac vacuum relays for sale (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 09 Jul 2007 08:41:31 -0700
I've been using Matsushita/Aromat RSD-12v reed relays. I've used a lot of them for input relays with no problems, and now I have a solid-state amp which puts out up to 140w using two of them, one for
/archives//html/Amps/2007-07/msg00116.html (9,325 bytes)

250. Re: [Amps] grounding grids (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 25 Sep 2007 09:27:32 -0700
I don't know about smarter or not, but he is certainly right about the grids, the folded monopole, the nichrome, and the balun. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco __________________
/archives//html/Amps/2007-09/msg00283.html (7,361 bytes)

251. Re: [Amps] CB Amps or full spectrum??? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 09 Oct 2007 07:47:25 -0700
These are all CB amps. There are at least two problems which make them unusable on the ham bands. One is that they often do not have biasing circuits that are really appropriate for voice transmissio
/archives//html/Amps/2007-10/msg00086.html (7,810 bytes)

252. Re: [Amps] tuner anomalies (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 30 Oct 2007 16:16:24 -0700
One possibility is that a large amount of RF on the 'grounded' side of the tuner is upsetting the SWR measurement. You say it worked before -- have there been changes in the path from the tuner to gr
/archives//html/Amps/2007-10/msg00279.html (7,591 bytes)

253. Re: [Amps] tuner anomalies (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 30 Oct 2007 17:35:38 -0700
If the chassis of the tuner is hot with RF, there can be a power-dependent error in SWR measurements. I wouldn't expect a 'jump', though, this would be a smooth increase. Also, depending on the diode
/archives//html/Amps/2007-10/msg00281.html (7,830 bytes)

254. Re: [Amps] Output Coupling Capacitors: Failure Mode? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sat, 03 Nov 2007 05:47:21 -0700
You are lucky if you found a large choke that doesn't have any series resonances near the higher ham bands. If it does, it will soon be 'zorched' like the old one! Temporarily short the choke with a
/archives//html/Amps/2007-11/msg00037.html (7,933 bytes)

255. Re: [Amps] [AMPS] Drake L-4 negative grid current reading on meter (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 21 Nov 2007 12:12:54 -0800
It's quite common that these shorts do not appear unless the filament is hot. I've seen this several times just on my own and friends' amps. Substituting a good tube is really the best test. -- 73, V
/archives//html/Amps/2007-11/msg00317.html (8,560 bytes)

256. [Amps] Wanted -- open frame relays (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 28 Nov 2007 09:47:30 -0800
I am in need of one or two open-frame DPDT relays that can be used for RF. The ones I want are about 2" square (similar to the 3PDT one found in the Johnson Matchbox). I can use relays with 12 or 24
/archives//html/Amps/2007-11/msg00386.html (6,541 bytes)

257. Re: [Amps] Wanted -- open frame relays (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 28 Nov 2007 11:30:58 -0800
I have some of these. They are OK for low-impedance lines, but I am switching 600-ohm open lines in this case and the contacts are a little close together for the voltages involved. -- 73, Vic, K2VCO
/archives//html/Amps/2007-11/msg00388.html (6,946 bytes)

258. Re: [Amps] ALS-600S... good news! (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 28 Jan 2008 08:06:07 -0800
Where do they say that there is an automatic bandswitching version? All I see on their website is a mention of 'instant' bandswitching. But the schematic shows a rotary switch directly switching filt
/archives//html/Amps/2008-01/msg00233.html (7,863 bytes)

259. Re: [Amps] ALS-600S... good news! (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 28 Jan 2008 14:30:06 -0800
Is there a description/specs available somewhere? Or did they tell you this on the phone? I can't find it on their website. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________
/archives//html/Amps/2008-01/msg00246.html (7,969 bytes)

260. Re: [Amps] 50 or 60Hz (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 03 Mar 2008 20:17:45 -0800
I discussed this with Peter Dahl when ordering a transformer which I wished to use both here and in a 50-Hz. country. He explained that, especially as transformers get larger, a 50-Hz. rated transfor
/archives//html/Amps/2008-03/msg00038.html (6,966 bytes)

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