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101. [AMPS] Dem' Blues (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 15 Sep 1997 10:35:47 +0000; If the blue glow is between the elements of the tube, that's a bad sign (gas). If the glass alone is glowing blue, it's unimportant (phosphorus in glass). If the tube has sat idle for a very long tim; /archives//html/Amps/1997-09/msg00299.html (7,426 bytes)
102. [AMPS] graphite anodes (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 15 Sep 1997 10:35:47 +0000; To: <amps@contesting.com> Hi Peter, Eimac used to do that, now Triton is. They use some tantalum and zirconium (that's the dull gray coating on the anode). That's why the anode has to run at the poi; /archives//html/Amps/1997-09/msg00300.html (7,426 bytes)
103. [AMPS] impedance of nichrome lower (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 15 Sep 1997 10:35:47 +0000; Not all that difficult, since I measured several nichrome suppressors here over the years Rich. When all the BS is sorted out, the end result is there is VERY little difference between the "magic cu; /archives//html/Amps/1997-09/msg00301.html (9,543 bytes)
104. [AMPS] impedance of nichrome lower (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 15 Sep 1997 10:35:47 +0000; To: <amps@contesting.com> Hi Carl, That was my understanding of what he did. About four turns over a 1/2 watt carbon composition type resistor. Yes. That must have been a 220 or something with longe; /archives//html/Amps/1997-09/msg00302.html (15,589 bytes)
105. [AMPS] 3-500z Cooling air (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 16 Sep 1997 22:28:00 +0000; To: <amps@contesting.com> Hi Jussi, The tube temperature is the main concern, not the exhaust air temperature (unless you worry about damaging the cabinet or something next to the cabinet). No, but; /archives//html/Amps/1997-09/msg00310.html (7,700 bytes)
106. [AMPS] More SB-220 amusement(!) (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 18 Sep 1997 10:47:35 +0000; To: <amps@contesting.com> How long did the less than perfectly designed Heath parts work? IMHO, many of these home remedy mods are a waste of money and time. It's kind of like me selling you car wax; /archives//html/Amps/1997-09/msg00320.html (9,767 bytes)
107. [AMPS] Re: TopBand: Followup Beverage Box (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 18 Sep 1997 10:47:35 +0000; To: <amps@contesting.com> My experience agrees with Carls. I'd like to add something I have observed building post amps and pre amps in broad band systems. The MAR series of amps are VERY IMD prone; /archives//html/Amps/1997-09/msg00321.html (9,744 bytes)
108. [AMPS] My SB-220 smoked today too! (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 23 Sep 1997 06:01:23 +0000; Hi Gary, Tubes sometimes just fail. That simple fact of life used to keep TV repairman quite busy. All the chants to the photon Gods and voo doo science in the world won't change the facts. ;-) I'd a; /archives//html/Amps/1997-09/msg00355.html (7,749 bytes)
109. [AMPS] L-4B grid ckt shorts (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 23 Sep 1997 07:38:10 +0000; To: <amps@contesting.com> That's a good question Ian, since even 2000 volts of positive grid and anode voltage wouldn't drive that much current through the tube. The peak emission current of an idea; /archives//html/Amps/1997-09/msg00356.html (9,113 bytes)
110. [AMPS] CENTURION FIXED TNX ALL (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 24 Sep 1997 11:15:02 +0000; To: <amps@contesting.com> Nonsense. Every bit of energy making it to the electrolytics very LOW impedance must go through the diodes. The dodes are much less able to absorb transient energy than the; /archives//html/Amps/1997-09/msg00358.html (8,362 bytes)
111. [AMPS] Alpha 77 amps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 2 Aug 1997 20:13:19 +0000; To: <amps@contesting.com> <SNIP> Strange. I just looked at a bone stock tank two tube Alpha conversion and it worked just fine. Power output was good (about 4 kW) and harmonics were within reason. A; /archives//html/Amps/1997-08/msg00015.html (9,076 bytes)
112. [AMPS] Alpha 77 amps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 3 Aug 1997 11:04:42 +0000; To: <amps@contesting.com> Only your use of it in defining "coherent", and calling square waves "incoherent". I measured it here and it was about 4 kW. It tuned properly and had -47dB second harmonic; /archives//html/Amps/1997-08/msg00020.html (11,608 bytes)
113. [AMPS] Alpha 77 amps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 3 Aug 1997 20:12:10 +0000; To: <amps@contesting.com> Tank current relates only the the fundamental frequency RF current driving the tank and the Q. If the operating anode impedance (done by Chaffe analysis) is 2000 ohms, and; /archives//html/Amps/1997-08/msg00024.html (12,919 bytes)
114. [AMPS] Re: doorknobs (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 4 Aug 1997 10:36:20 +0000; To: <amps@contesting.com> The price of "surplus" doorknobs offered by some vendors is often over three times the wholesale NEW cost of the same component. If you want doorknobs, try Fair Radio or ha; /archives//html/Amps/1997-08/msg00031.html (8,707 bytes)
115. [AMPS] Re: Heath sb200/201 amplifiers (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 5 Aug 1997 00:47:33 +0000; To: <amps@contesting.com> That was suggested as a method of adding negative feedback to the tube. It was done without proper measurement, and proved to be a bad idea. Your gut instinct is correct, it; /archives//html/Amps/1997-08/msg00040.html (8,806 bytes)
116. [AMPS] Grid current question (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 7 Aug 1997 14:05:37 +0000; To: <amps@contesting.com> Probably because in a cathode driven PA the grid is the best single indicator of proper tuning, and the grid is the easiest element of the tube to damage by mis-tuning. It'; /archives//html/Amps/1997-08/msg00058.html (8,042 bytes)
117. [AMPS] Grid current question (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 7 Aug 1997 12:09:12 +0000; To: <amps@contesting.com> Great. That's the way they work Bill. I hope you have a fast electronic overload system that samples grid current. You can trash the grid pretty fast if the load even momen; /archives//html/Amps/1997-08/msg00060.html (8,847 bytes)
118. [AMPS] Re: 8877 grid disp. (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 7 Aug 1997 18:09:54 +0000; To: <amps@contesting.com> Eimac's 8877 data sheet 2206, dated 3/91, plainly says 20 watts in three places. Older data sheets say the same thing. The quick reference, which may be the source of your; /archives//html/Amps/1997-08/msg00063.html (7,596 bytes)
119. [AMPS] Grid dissipation (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 7 Aug 1997 21:40:50 +0000; To: <amps@contesting.com> I'll trust your word, hi. I have some older sheets but nothing that old for the 8877. The data sheets I have indicate 20 watts, although the Quick Reference Selection Guide; /archives//html/Amps/1997-08/msg00065.html (9,002 bytes)
120. [AMPS] Grid dissipation (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 8 Aug 1997 10:38:13 +0000; To: <amps@contesting.com> Rich, You really should not give false advice like this to people trying to learn. Twisted statements like you made above give people the totally wrong idea about grid diss; /archives//html/Amps/1997-08/msg00075.html (9,562 bytes)

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