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1. [AMPS] 8877 bias curve? (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 02 Nov 2001 03:40:50 -0800; Hi folks, Doing some tinkering here, I worked out a polynomial based on Eimac's GG constant current curves for the 8877 to calculate static plate current based on a given bias voltage. Does anyone ha; /archives//html/Amps/2001-11/msg00010.html (8,099 bytes)
2. [AMPS] 8877 bias curve? (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 02 Nov 2001 06:10:41 -0800; Thanks! It's just a tinker-project anyway, but I thought it would be closer than that. Some day down the road I'd like to work out a real model, so that I could watch things spin around in SPICE. No; /archives//html/Amps/2001-11/msg00013.html (8,112 bytes)
3. [AMPS] 8877 bias curve? (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 02 Nov 2001 09:06:59 -0800; Thanks, Phil. I penciled in a 12V 50W zener for use at 3900V, but haven't gotten anything off paper yet. I'm also fiddling with a silicon bias switch and regulator combo, but have a ways to go. I lik; /archives//html/Amps/2001-11/msg00019.html (8,149 bytes)
4. [AMPS] SB200 Filament Voltage (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Wed, 07 Nov 2001 05:58:26 -0800; That brings a question to mind. Has anyone come up with a really nifty low-resistance, long-life method to terminate nichrome wire for high current applications? The only thing that comes to mind at; /archives//html/Amps/2001-11/msg00126.html (8,446 bytes)
5. [AMPS] Alpha 76A (two-hole) question (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 09 Nov 2001 07:01:16 -0800; Hi folks, I finished restoring a two-hole 76A a few months ago, and it seems to be running fine. (nice little amp) My question: With the original attenuator, (resistor pack) I get roughly 650-700 wat; /archives//html/Amps/2001-11/msg00157.html (7,041 bytes)
6. [AMPS] alpha input swamp circuit (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Mon, 12 Nov 2001 06:52:31 -0800; Rich and Skipp, For whatever it's worth, the highest VSWR I've seen at the radio is 1.6:1 . I can't tell you what it is at this half-cycle versus that one, of course, only what the digital metering o; /archives//html/Amps/2001-11/msg00193.html (8,178 bytes)
7. [AMPS] 8877 rectifier board considerations (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Sat, 17 Nov 2001 09:25:08 -0800; Hi folks, I'm at the point where I'm laying out the B+ rectifier board for my 8877 project, and it occurs to me I don't know much about component spacing for high-voltage (2800 VRMS, 3900VDC typical); /archives//html/Amps/2001-11/msg00311.html (8,581 bytes)
8. [AMPS] 8877 rectifier board considerations (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Mon, 19 Nov 2001 09:35:11 -0800; Steve, John, and others that replied off the reflector: Thanks for the replies. I agree that it's much easier to buy pre-built modules, certainly cheaper when you consider the cost of having prototyp; /archives//html/Amps/2001-11/msg00336.html (8,761 bytes)
9. [AMPS] 8877 rectifier board considerations (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Mon, 19 Nov 2001 15:26:26 -0800; Since this beastie will only see an ampere on the rare and unintended peak, I suspect that either diode strings or modules will last a long time, unless It Happens. There's a 50-ohm, 100-watt resisto; /archives//html/Amps/2001-11/msg00353.html (9,390 bytes)
10. [AMPS] 8877 rectifier board considerations (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Tue, 20 Nov 2001 04:07:19 -0800; And Rich answered: Ah. Then the tales of heating the tubes for a period after extended storage are just that. I have no reason to believe any seal is leaky, but I had heard that the potential for a s; /archives//html/Amps/2001-11/msg00369.html (9,155 bytes)
11. [AMPS] 8877 rectifier board considerations (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Tue, 20 Nov 2001 08:48:28 -0800; Ian, Ok, that makes sense. I suppose an inverted way of looking at it is that if the tube -didn't- emit any gas internally, there would be no need for a getter. One of the reasons I asked was based o; /archives//html/Amps/2001-11/msg00381.html (9,962 bytes)
12. [AMPS] CW/SSB Tune Up (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Mon, 08 Oct 2001 20:53:42 -0700; Only half kidding here - Try "four, four, four, four" (enunciate) and watch the meter. Out of all the silliness tried, it seems to kick the hardest, at least with my voice, mics, and meters. Jim, N7; /archives//html/Amps/2001-10/msg00208.html (8,261 bytes)
13. [AMPS] RE: Beer (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Tue, 09 Oct 2001 09:33:03 -0700; <html> <br> Deeply wounded, sir.<br> If you ever happen to land in the eastern Washington desert,<br> try a little micro-brewery called "Grant's", in Yakima. They<br> have a tan&tar tha; /archives//html/Amps/2001-10/msg00234.html (7,714 bytes)
14. [AMPS] LDG DWM-4 and high power? (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Wed, 24 Oct 2001 14:47:05 -0700; Hi folks, Does anyone have any good or bad stories to tell about using an LDG Electronics DWM-4 wattmeter at high power? They recently added a 2KW coupler to their product line, but I'm a little nerv; /archives//html/Amps/2001-10/msg00474.html (6,761 bytes)
15. [AMPS] True Or Not True #2 (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 07 Sep 2001 02:47:37 -0700; [snip] Another related problem is keeping the receiver gain flat from 1.8 to 30mhz. You could keep a separate correction table for each band, but that takes a lot of memory space. It would also have; /archives//html/Amps/2001-09/msg00097.html (9,541 bytes)
16. [AMPS] Gound fault (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 10 Aug 2001 05:52:34 -0700; If it's a common-ground problem, try flipping the non-polarized (horrible design) relay plug over on the back of the amp. Not than anyone asked, but many L4-B's also do not have a back-burp diode acr; /archives//html/Amps/2001-08/msg00118.html (7,484 bytes)
17. [AMPS] Alert (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Sat, 21 Jul 2001 11:59:46 -0700; Yep.. I've received 4 copies of a mail worm in the last couple of days, all from the same address. The header could always be spoofed, but CQ W9UC?? Jim, N7CXI -- FAQ on WWW: http://www.contesting.c; /archives//html/Amps/2001-07/msg00257.html (6,781 bytes)
18. [AMPS] continued Alpha work (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Sat, 02 Jun 2001 18:20:34 -0700; Skipp, Tom's analysis brought up an excellent point. If the amp is an original PA-77, there should be 5 megohms resistance between B- and ground. Easy test. Selected bits: Regards, Jim, N7CXI -- FAQ; /archives//html/Amps/2001-06/msg00021.html (8,195 bytes)
19. [AMPS] PA-77 retrofit questions (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Fri, 08 Jun 2001 09:01:16 -0700; Hi folks, Thanks to all that responded to my original "PA-77 musings" query. I'm back, though, with a few other questions for the panel. :-) I've decided to move the B+ supply and mains/step-start co; /archives//html/Amps/2001-06/msg00073.html (8,505 bytes)
20. [AMPS] PS cabinet (score: 1): Author: N7CXI@SiliconPixels.com (Jim Barber); Date: Tue, 19 Jun 2001 17:43:54 -0700; First, I have to confess.. I have eaten sliced white Wonder Bread, and liked it. Now.. Back to my PA-77 retrofit, I'm looking for a suitable cabinet for the external power supply. So far, a Bud "Econ; /archives//html/Amps/2001-06/msg00170.html (6,932 bytes)

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