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1. [Amps] Measurements GDO (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu Jul 3 09:09:37 2003; Jim Sounds like a Measurements model 59. Does it have a rotary switch to select three functions on the main power/meter unit? Also, the 'head" (RF unit) is round, not octagonal like a stop sign? They; /archives//html/Amps/2003-07/msg00018.html (6,368 bytes)
2. [Amps] particle beam from microwave oven??? (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Tue Jul 29 23:01:50 2003; This didn't make sense; what does microwave energy in a waveguide have to do with particle beam weapons? Particle beams are made with particles like protons, neutrons or electrons which are typically; /archives//html/Amps/2003-07/msg00154.html (6,849 bytes)
3. [Amps] longevity of oxide cathode tube (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Tue Jun 24 08:56:43 2003; A comrade at another national laboratory uses 4CX350A by the dozens. They have 4 driving 4 in a class A high level feedback preamp circuit at 2-4 MHz. And many installations of this setup. This month; /archives//html/Amps/2003-06/msg00197.html (9,371 bytes)
4. [Amps] 160 output problem (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Wed May 21 09:15:17 2003; Sounds like output coupling is not happening, if grid current is higher on 160 and output is lower. Calculate the reactance of your blocker capacitor, for one thing. I get about 49 ohms at 1.8 MHz, w; /archives//html/Amps/2003-05/msg00151.html (7,335 bytes)
5. [Amps] 160 output problem (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu May 22 09:49:49 2003; Sorry about that, last amplifier in this freq range I built had the pi network for 500 ohms at the anode, so I remembered using 20,000 pF or something in that range. Rich is correct that for a 2K-3K; /archives//html/Amps/2003-05/msg00166.html (7,390 bytes)
6. [Amps] 160 padders (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu May 22 09:49:55 2003; With that tempco, it will drift with RF power. You'd be better off with N750 or even better with NPO. You can buy NPOs in values under about 75 or 100 pF in 5kV rating I think. Would take a lot of th; /archives//html/Amps/2003-05/msg00167.html (6,963 bytes)
7. [Amps] ferrite transformers (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu May 29 09:34:39 2003; The designs in Sevick's book and prior transmission line transformer design papers and books work well, as long as you pay attention to details such as winding the turns as tightly coupled transmissi; /archives//html/Amps/2003-05/msg00219.html (8,139 bytes)
8. [Amps] ferrite cores (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Sat May 31 08:12:09 2003; W8NF's reply expresses the basic descriptions of how the various modern ferrite transformers work. I hadn't heard it said as concisely! And Mr. Sevik jumps too quickly into many dozens of examples -; /archives//html/Amps/2003-05/msg00238.html (6,241 bytes)
9. [Amps] T'bolt (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Tue Apr 1 12:09:56 2003; I recommend a good read of the archives of this list, past years worth, as there has been a bit of Thunderbolt work here. And it is monster, but consider that it can only output < 1 kW, as a matter o; /archives//html/Amps/2003-04/msg00007.html (6,596 bytes)
10. [Amps] hear hear about the toobs (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Mon Mar 3 09:51:44 2003; I wholeheartedly agree with John and Tom's points about transmitting tubes and how manufacturers can easily loose the formula, sometimes they do regain it. In my own 25 years experience in the end us; /archives//html/Amps/2003-03/msg00048.html (10,662 bytes)
11. [Amps] info on the GE MRI contract settled (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Tue Mar 4 12:23:35 2003; Thanks Dave H., for your candid view and possibly explanation of the GE/ETO dealings. Erbtec also made some nice looking equipment, as I was a potential customer in those days, working in industrial; /archives//html/Amps/2003-03/msg00109.html (12,595 bytes)
12. [Amps] test hv diodes (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Fri Mar 14 12:20:25 2003; To test HV diodes, you can do two independent tests with different setups. Check forward drop, conduction mode, with a normal 24-48 VDC power supply, and a series resistor to limit I. You might assum; /archives//html/Amps/2003-03/msg00552.html (7,238 bytes)
13. [Amps] fil inrush (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Wed Mar 26 10:16:29 2003; In large tubes, that require a hoist to pull them from the socket, we either us DC on the filament or use a specially shunted transformer as has been discussed before. The manufacturers have been kee; /archives//html/Amps/2003-03/msg00843.html (6,686 bytes)
14. [Amps] smoking oscillations (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu Mar 27 10:24:27 2003; K5PC - Phil Clements is right on the button about our most popular subject here. (see excerpt below) Amen! I have found myself in the #3 category in my designs over the past 25yrs. Have spent months; /archives//html/Amps/2003-03/msg00869.html (11,678 bytes)
15. [Amps] vac relay in Heathkit amp (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu Mar 27 11:25:23 2003; Paul I have a SB220 with vac relay on the output switch. I will try and photo it soon for you, as I have a basket case -220 which I am restoring for a co-worker, who will trade me a Collins 51J4 RX f; /archives//html/Amps/2003-03/msg00872.html (6,744 bytes)
16. [Amps] candles (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Thu Mar 27 12:54:38 2003; I learned last summer in France that the Thomson (now Thales) company calls them candles, in French. They had two 47 Ohm Resistors sticking up in the HV compartment of this Th628 test set, to dampen; /archives//html/Amps/2003-03/msg00877.html (6,869 bytes)
17. [Amps] injected SPAM (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Sun Mar 30 12:58:34 2003; WC6W, As I was downloading an AMPS mailer today on my lowly 26K modem (all Qwest can provide in the rural NM desert at this home QTH), I noted that 1/3 of the articles, and about 75% of the text was; /archives//html/Amps/2003-03/msg00938.html (7,387 bytes)
18. [Amps] OK i understand (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Sun Mar 30 16:41:38 2003; In America we do allow freedom of speech (not like a certain Mid Eastern country on the news right now) , and the words here seems to be suggesting that Marv's sales of amp parts are not such a nuisa; /archives//html/Amps/2003-03/msg00947.html (6,452 bytes)
19. [Amps] sat transformer for filament (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Tue Feb 4 10:04:11 2003; Its done sort of this way in larger rigs, usually an off the shelf unit for 120/240 VAC is used, a ferroresonant type with 3 windings and a capacitor. Then a standard filament transformer or special; /archives//html/Amps/2003-02/msg00063.html (7,669 bytes)
20. [Amps] 100 Watt WW resistor Voltages (score: 188): Author: jtml at lanl.gov (John T. M. Lyles); Date: Tue Feb 4 10:24:05 2003; What is the maximum safe end to end DC voltage you can reliabily use a 100 Watt wirewound resistor for? In a bleeder application. It dawned on me that I remember seeing one flash over and self destru; /archives//html/Amps/2003-02/msg00064.html (6,751 bytes)

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