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

Total 418 documents matching your query.

301. Re: [Amps] Sleeve Baluns FS (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sat, 25 Apr 2009 23:07:49 -0700
They may be made out of a material that's inappropriate for the job. But you said and I disagreed, because the number of cores is irrelevant -- it's the total length of the cores that counts, not the
/archives//html/Amps/2009-04/msg00366.html (7,997 bytes)

302. Re: [Amps] SB-220 Bias Question (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 10 Jun 2009 21:00:11 -0700
If the zero-signal plate current is close to what the book says it should be (I've forgotten exactly but someone will know) then it will be OK. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco __
/archives//html/Amps/2009-06/msg00049.html (6,897 bytes)

303. Re: [Amps] Commander HF-1250 problems (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 16 Jul 2009 07:59:01 -0700
This wasn't the most popular amp they made! But why don't you contact the manufacturer? Info is at <http://www.command1.com/contact.html> -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ________
/archives//html/Amps/2009-07/msg00200.html (7,595 bytes)

304. Re: [Amps] spray painting metal (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 31 Jul 2009 08:06:56 -0700
Another spray can tip: they tell you to shake it for a minute after the agitator ball is free. That's not enough! Five minutes is better. It's also helpful to warm it it bit in some warm water first,
/archives//html/Amps/2009-07/msg00435.html (7,693 bytes)

305. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 05 Aug 2009 07:50:32 -0700
This is generally called a 'blocking' capacitor. As this is a high-impedance part of the circuit there is no reason for such a large value, and 0.001 uf would be fine unless the amplifier covers 160
/archives//html/Amps/2009-08/msg00085.html (8,477 bytes)

306. Re: [Amps] Plate Bypass Capacitor (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Wed, 05 Aug 2009 07:55:38 -0700
Ooops, mistake. It IS the bypass capacitor, not the blocking capacitor. Here 0.001 is probably too little -- I recommend at least 0.01 and if the amp covers 160 meters even 0.05 wouldn't be a bad cho
/archives//html/Amps/2009-08/msg00086.html (7,619 bytes)

307. Re: [Amps] LK500-ZB (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 11 Sep 2009 07:50:23 -0700
Between ONE of the filament pins and the grid! Across the filament would of course destroy it. My experience with these tubes has been that it's common to see a short that develops only after the fil
/archives//html/Amps/2009-09/msg00151.html (7,773 bytes)

308. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 13 Oct 2009 09:53:00 -0700
Using a GDO, you SHORT the choke to check for SERIES resonances. I don't see how a parallel resonance would hurt, since it would create a very high impedance, which is desirable. -- 73, Vic, K2VCO Fr
/archives//html/Amps/2009-10/msg00197.html (8,669 bytes)

309. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 30 Nov 2009 09:30:17 -0800
Well, my SB-1000 with ONE 3-500z will produce 1100 watts output, if I forget to turn down the drive from my exciter. The question is "for how long will it do this?" My guess is "not too long!" -- 73,
/archives//html/Amps/2009-11/msg00308.html (8,899 bytes)

310. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 30 Nov 2009 11:59:56 -0800
I load mine to 400ma plate current and get about 750 watts (slightly less on 10m, more on 80/40). Interestingly, I get less power on 160 than 80/40, and I think this is because the tank coil is close
/archives//html/Amps/2009-11/msg00312.html (8,899 bytes)

311. Re: [Amps] Chinese DIN connectors (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 10 Dec 2009 13:26:10 -0800
Somebody recently said that you could 'plug' them into a potato before soldering. I tried this and it actually works. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ____________________________
/archives//html/Amps/2009-12/msg00276.html (8,130 bytes)

312. Re: [Amps] "Stacking" power supplies?? how? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Mon, 14 Dec 2009 08:31:20 -0800
Some regulated supplies have 'sense' terminals which, when connected together, assure that the output voltages will track. I had two Astron RS-70 12 volt supplies that I used to power a solid-state a
/archives//html/Amps/2009-12/msg00321.html (9,283 bytes)

313. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 18 Dec 2009 10:51:19 -0800
That's what I did with my SB-1000. Here's a comment I posted at the time: -- In my quest for a quiet SB-1000, I replaced the fan. The original is a Nidac TA450AC, which is rated at 68 cfm and operate
/archives//html/Amps/2009-12/msg00446.html (9,588 bytes)

314. Re: [Amps] Fleamarkets (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 02 Feb 2010 08:33:03 -0800
I'm afraid this is off-topic, but I live in an agricultural area and as a result of water and environmental issues and loss of farmland to build Yet Another Walmart, soon we'll be importing all of ou
/archives//html/Amps/2010-02/msg00081.html (8,270 bytes)

315. Re: [Amps] 120 cycle hum from Henry 2K-4 (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Thu, 18 Feb 2010 17:20:14 -0800
Be careful if you fix this. It's not tuned to *exactly* 120 Hz because that would cause a very high voltage to appear across the choke. Use the specified values if you replace anything. Also -- if it
/archives//html/Amps/2010-02/msg00534.html (9,050 bytes)

316. Re: [Amps] Step Start circuit - needed or not? (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Tue, 23 Feb 2010 08:18:40 -0800
The SB-1000 does not require a step-start. The transformer is designed so that the secondaries have enough impedance to protect the diodes and tube filament at startup. It also has a relay to protect
/archives//html/Amps/2010-02/msg00694.html (8,997 bytes)

317. [Amps] Utilization of old TV transformer (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 19 Mar 2010 12:32:56 -0700
I have an old TV power transformer that I am thinking about using as a plate transformer for a medium-power amplifier (2 x 813). It weighs between 15 and 20 pounds and the stack is 3.25" x 4.5" x 4".
/archives//html/Amps/2010-03/msg00376.html (7,414 bytes)

318. Re: [Amps] placement of RF choke bypass cap. (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 19 Mar 2010 14:04:03 -0700
The tube socket holes are the natural path. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2010-03/msg00379.html (8,519 bytes)

319. Re: [Amps] Utilization of old TV transformer (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 19 Mar 2010 14:49:52 -0700
I'm replying to this particular message, but I want to thank everyone else who responded to my query, on and off list. The consensus of opinion is: 1) Forget the tripler circuit unless I want to use
/archives//html/Amps/2010-03/msg00380.html (7,915 bytes)

320. Re: [Amps] Utilization of old TV transformer (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Fri, 19 Mar 2010 17:45:46 -0700
Yes, you're right about doubling the current. I was definitely exaggerating! Trying to talk myself into it. You are right about shipping something that heavy by air! It would probably cost less to bu
/archives//html/Amps/2010-03/msg00391.html (9,084 bytes)

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