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1. Re: [Amps] 572Bs (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 19 Jan 2011 10:26:47 -0500; In any realistic parallel application. matching is not important. You match tubes for gain in a push-pull configuration to ensure linearity as each tube only conducts for half a cycle. Al AB2ZY Thank; /archives//html/Amps/2011-01/msg00187.html (7,463 bytes)
2. Re: [Amps] 572Bs (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 19 Jan 2011 18:01:56 -0500; I thought the Svetlana tubes were long out of production? Al AB2ZY My pleasure Mitch I get mine from a supplier in China but you can get them from the guy below at exactly the same prices. I have bou; /archives//html/Amps/2011-01/msg00191.html (17,688 bytes)
3. Re: [Amps] What to buy? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Thu, 27 Jan 2011 12:22:55 -0500; CQ recently waxed eloquent about the Dishtronix Prometheus, a 1500W+ solid state amplifier. http://www.dishtronix.com/prometheus.html#fragment-8 For $10,000+, it better be good! I've got to admit tha; /archives//html/Amps/2011-01/msg00365.html (8,945 bytes)
4. Re: [Amps] looking for idea on switching arrangment (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Mon, 31 Jan 2011 13:31:41 -0500; I would do all switching with relays. You can then use any old single pole rotary switch with diodes to implement the switching logic. Added benefit is that it's easy to implement computer control if; /archives//html/Amps/2011-01/msg00466.html (10,317 bytes)
5. Re: [Amps] Good Lord! for a pair of 12AT7s? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sun, 6 Feb 2011 11:48:59 -0500; When I was in high school I worked for a TV station. In exchange for coiling up a bunch of cables that were "stored" outside, I was given as much 50's era station equipment as I could fit in my paren; /archives//html/Amps/2011-02/msg00037.html (7,969 bytes)
6. Re: [Amps] T/R delay mod for AL-811? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Thu, 10 Feb 2011 17:36:40 -0500; Doesn't your rig support semi-break-in? Al AB2ZY Hello all, I'm looking for a way to adjust the T/R delay of my AL-811 and wondering if anyone knows of an online source of info...so far, I haven't be; /archives//html/Amps/2011-02/msg00091.html (8,728 bytes)
7. Re: [Amps] copper vs steel /SS /brass conductors in a HF tank circuit (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 23 Mar 2011 12:10:59 -0400; All stainless steels are ferrous and I would think that they'd thus all be subject to RF heating. The 300 series alloys have, in general, a higher percentage of chromium and nickel and are not magnet; /archives//html/Amps/2011-03/msg00175.html (9,560 bytes)
8. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sun, 3 Apr 2011 15:08:22 -0400; The "extra" ground wire is needed only when a 240V appliance includes 120V devices. A range is a classic example - the oven elements are 240V and the stove stop elements and lighting is 120V. For saf; /archives//html/Amps/2011-04/msg00036.html (12,073 bytes)
9. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sun, 3 Apr 2011 15:15:49 -0400; What the hell, I knew what I meant! ;^) Al AB2ZY AB2ZY: Replace the word "neutral" and substitute with "ground". Paul, W9AC _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2011-04/msg00038.html (10,158 bytes)
10. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sun, 3 Apr 2011 16:38:24 -0400; I already corrected myself - "neutral" should be "ground". Al AB2ZY This is bass akwards. A power that runs on 240V MUST draw power between the two sides of 240 volts. NO NEUTRAL CONNECTION IS NEEDED; /archives//html/Amps/2011-04/msg00047.html (11,121 bytes)
11. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sun, 3 Apr 2011 22:56:12 -0400; That finally explains the odd (by my American standard) placement of light switches I've observed in my European and other travels to former British colonies where the mains voltage is 240V. Al AB2Z; /archives//html/Amps/2011-04/msg00063.html (8,336 bytes)
12. Re: [Amps] 4 wire 240VAC service? What to do now? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Mon, 4 Apr 2011 15:24:22 -0400; Yes, the neutral bus bar is insulated and separate from from grounding bus bar. You don't bond the neutral and safety ground from the outlet or other device together in the subpanel like you would in; /archives//html/Amps/2011-04/msg00122.html (15,246 bytes)
13. Re: [Amps] Alpha vs Henry (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 6 Apr 2011 17:05:00 -0400; Can anyone tell me how much power an AL-1500 is rated to produce at a 100% duty cycle? During RTTY contests and outputting about 1000 watts, the tube side of the cabinet gets mighty warm. The power s; /archives//html/Amps/2011-04/msg00253.html (10,032 bytes)
14. Re: [Amps] Alpha vs Henry (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 6 Apr 2011 20:35:30 -0400; 1500 watts continuous for 30 minutes; 2500 for 30 seconds. Even if I do nothing but call CQ every 2 seconds, that's probably "only" about a 60% duty cycle. I'm just trying to get a feel for how much; /archives//html/Amps/2011-04/msg00262.html (11,299 bytes)
15. Re: [Amps] Alpha vs Henry (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 6 Apr 2011 20:38:39 -0400; Thanks. You've reminded me that there is a blower speed selector in the cabinet and I should definitely make sure that it's running at the max for RTTY contests. 73 Al AB2ZY It should. Running 100% d; /archives//html/Amps/2011-04/msg00263.html (12,486 bytes)
16. Re: [Amps] 3-1000 Amplifiers (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 11 May 2011 11:14:59 -0400; Absolutely. However, the weight of a structure that size that could withstand the forces of a vacuum would well exceed the forces of buoyancy! Al AB2ZY So, since the Hindenburg had a rigid structure,; /archives//html/Amps/2011-05/msg00052.html (11,643 bytes)
17. Re: [Amps] 3-1000 Amplifiers (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 11 May 2011 16:22:44 -0400; The amount of lift available from the air displaced by the Hindenburg (using the gas volume only as an approximation of displacement) would be roughtly 525,000 lbs at 60 degrees F. The total pressure; /archives//html/Amps/2011-05/msg00060.html (12,044 bytes)
18. Re: [Amps] Imported 8877 Tube Source (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Mon, 23 May 2011 21:03:38 -0400; I purchased one from Henry Radio about a year and half ago. The amp it sits in is located at our lake house, so it only sees summer weekend duty and all the winter contests, including the RTTY contes; /archives//html/Amps/2011-05/msg00206.html (8,054 bytes)
19. Re: [Amps] 4-1000A Pi-Output-Load-Control & RTTY (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 25 May 2011 16:50:00 -0400; If running a tube (or any component) within its design rating is emotionally distressing, that's a psychological problem, not technical! Al AB2ZY Isn't that nice red comforting if you want to keep th; /archives//html/Amps/2011-05/msg00219.html (12,581 bytes)
20. [Amps] Dummy load varying R (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Wed, 8 Jun 2011 11:22:11 -0400; Maybe not quite amps related, but this is the best forum I know of for RF expertise ... Without belaboring irrelevant details, I'm calibrating an LP-100A wattmeter I just built. With a brand new MFJ; /archives//html/Amps/2011-06/msg00103.html (7,910 bytes)

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