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1. [Amps] al80a (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Thu, 1 Aug 2002 16:45:14 -0700; Or there's a grid to filament short, while hot or cold. With an elevated B- rail and grid metering between B- and ground, plate current will flow through the grid meter shunt and can't be cut-off. T; /archives//html/Amps/2002-08/msg00013.html (8,471 bytes)
2. [Amps] ALPHA 77 (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sun, 4 Aug 2002 19:35:43 -0700; This "clean" isn't limited to the IMD performance of the amp. Harmonics/spurs are also reduced by this slight antenna overloading, usually by 5-15dbm. Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW; /archives//html/Amps/2002-08/msg00066.html (8,615 bytes)
3. [Amps] ALPHA 77 (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Mon, 5 Aug 2002 16:21:39 -0700; Yes, this is what I observe on my analyzer. Lighter loading runs up IG and doesn't have much effect on the harmonics or spurs. Paul; /archives//html/Amps/2002-08/msg00074.html (8,170 bytes)
4. [Amps] ALPHA 77 (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Mon, 5 Aug 2002 20:33:40 -0700; No, lighter antenna loading (more load C after max out reached ) had a minor effect. Heavier antenna loading (less load C) had a pronounced effect on harmonics and spurs. Paul; /archives//html/Amps/2002-08/msg00077.html (7,869 bytes)
5. [Amps] Input impedance needed (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Wed, 3 Jul 2002 16:03:00 -0700; Single 8877, 4KV @ 45-55 watts drive, ~50 ohms at the socket pins. Single 3cx800a7, 2.2KV @ 25-30 watts drive, ~50 ohms at the socket pins. Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS h; /archives//html/Amps/2002-07/msg00055.html (6,691 bytes)
6. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Thu, 18 Jul 2002 18:03:47 -0700; Adjustable yes, but you don't have to change taps, just apply current through the string and it's voltage drop wanders all over the place. For voltage stability this is the worst way to provide bias.; /archives//html/Amps/2002-07/msg00300.html (9,190 bytes)
7. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Fri, 19 Jul 2002 16:17:14 -0700; Barely but still not adjustable. I can't imagine the trying to obtain the ~25-30 volts of bias for the gs-35b (or yc-156/179) with >40 diodes in series, looney tunes. Later, Paul; /archives//html/Amps/2002-07/msg00342.html (8,946 bytes)
8. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Fri, 19 Jul 2002 19:59:32 -0700; 200, given as an approximation on the Eimac YC-156/3CPX5000 data sheets. Given as 200 on the 3CX3000A7 data sheet. Paul; /archives//html/Amps/2002-07/msg00348.html (8,693 bytes)
9. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sat, 20 Jul 2002 07:58:51 -0700; It take's ~26 volts with 4200vdc EP for ZSAC of 300ma. Paul; /archives//html/Amps/2002-07/msg00353.html (8,428 bytes)
10. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sat, 20 Jul 2002 07:58:58 -0700; Doesn't your proposed opto controlled bias switching transistor have the same torpedo problem during a parasitic?? Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net; /archives//html/Amps/2002-07/msg00354.html (8,519 bytes)
11. [Amps] re: CTI screen regulator, tubes vs solid state (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sat, 22 Jun 2002 08:28:11 -0700; Hi Paul Three weeks ago at the Sea-Pac convention, the HF amp was FCC type accepted but the six meter amp was not. It seems to be for sale on their website though. Paul PAUL HEWITT WD7S PRODUCTIONS; /archives//html/Amps/2002-06/msg00188.html (8,700 bytes)
12. [Amps] Rectifier diode strings (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sun, 5 May 2002 10:22:33 -0700; Precisely why MOV's or transient suppressors should be mandatory in all HV psu's. Living in a rural area with many farms using large water pumps will teach you this, HI! Paul; /archives//html/Amps/2002-05/msg00033.html (8,128 bytes)
13. [Amps] Rectifier diode strings (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sun, 5 May 2002 12:14:27 -0700; What's protecting the primary winding insulation?? Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net; /archives//html/Amps/2002-05/msg00035.html (9,884 bytes)
14. [Amps] Rectifier diode strings (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sun, 5 May 2002 14:39:57 -0700; The primary/secondary waveshape at 60 hertz may be close to the same but a transient may have a rise time faster than the core can saturate, (absorb it), voltage leads current lags. Paul PAUL HEWITT; /archives//html/Amps/2002-05/msg00039.html (8,556 bytes)
15. [Amps] Rectifier diode strings (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Sun, 5 May 2002 14:47:49 -0700; Big iron, means slow saturation. Is it worth the gamble for a 50 cent MOV even if it's for the primary only?? Not here. Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.; /archives//html/Amps/2002-05/msg00040.html (8,661 bytes)
16. [Amps] 8874 by Svetlana? (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Wed, 8 May 2002 06:07:13 -0700; Hi Jim Had some early release Svetlana 8874's here a couple of years ago. Worked fine, idling current was a little lower than the Eimac tubes. Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENT; /archives//html/Amps/2002-05/msg00082.html (6,715 bytes)
17. [Amps] resistors (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Mon, 20 May 2002 17:51:50 -0700; Hi Carl Really no reason for 3-watt resistors in a metering string for 1ma or less meter movements. Have a look at the Vishay/Dale CMF series resistors. 500v working with 900v withstanding. 3/4 watt; /archives//html/Amps/2002-05/msg00320.html (8,840 bytes)
18. [Amps] hv resistors (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Tue, 21 May 2002 17:32:26 -0700; Hosfelt Electronics did sell a 100meg 15kv resistor (< $3), not sure if they still do. Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net; /archives//html/Amps/2002-05/msg00341.html (9,922 bytes)
19. [Amps] 8122 sockets (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Wed, 29 May 2002 17:14:27 -0700; Do you need built-in coaxial screen by-pass? Ceramic or ??? Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net ilman/listinfo/amps; /archives//html/Amps/2002-05/msg00467.html (7,336 bytes)
20. [Amps] RE: Solid State HF amps and kits (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Fri, 19 Apr 2002 09:37:11 -0700; Michael You might also try this link for small quantity boards. http://www.apcircuits.com/ Their P1 service (two sided FR4) is very reasonable if you stick to their "free" drill sizes. Does not inclu; /archives//html/Amps/2002-04/msg00481.html (9,174 bytes)

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