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21. [AMPS] Question - Using 3 phase Xfmr on single phase power? (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Tue, 13 Nov 2001 12:27:58 -0500; I am trying to breathe life into an old HF amp (details below). It used 220 3 phase power originally and I am wondering what use I can get from it's combined screen grid and bias power supply transfo; /archives//html/Amps/2001-11/msg00231.html (10,893 bytes)
22. [AMPS] Question - Using 3 phase Xfmr on single phase power? (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Wed, 14 Nov 2001 00:17:08 -0500; All the connections to the primary windings are brought out separately, and not connected to each other inside the case. I actually have six separate primary windings in there, two independent 220V o; /archives//html/Amps/2001-11/msg00242.html (10,064 bytes)
23. [AMPS] Reverse-engineering design plate HV (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Wed, 14 Nov 2001 00:26:34 -0500; In an old 5CX3000A 1.6-32MHz amp I am working on, the plate blocking caps are rated at 8KV. Can I guesstimate from this what plate voltage was intended? It was made by TMC, presumably to commercial o; /archives//html/Amps/2001-11/msg00243.html (9,222 bytes)
24. [AMPS] Question - Using 3 phase Xfmr on single phasepower? RESOLVED (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Wed, 14 Nov 2001 22:35:19 -0500; Looks like your recommendation is going to work AOK, Bob. With 110 on primary leg A, I wired in primary leg B through a light bulb (to limit current if necessary). Even though I can measure about 31; /archives//html/Amps/2001-11/msg00250.html (10,750 bytes)
25. [AMPS] Reverse-engineering design plate HV (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Thu, 15 Nov 2001 09:21:44 -0500; In an old 5CX3000A 1.6-32MHz amp I am working on, the plate blocking caps are rated at 8KV. Can I guesstimate from this what plate voltage was intended? It was made by TMC, presumably to commercial o; /archives//html/Amps/2001-11/msg00259.html (7,382 bytes)
26. [AMPS] Reverse-engineering design plate HV (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Thu, 15 Nov 2001 13:12:35 -0500; Thanks. ARRL handbook indicated that blocking capacitor voltage rating should be about 2x the plate supply, but I didn't know if commercial specs would agree. It must have been about 4KV. I have to c; /archives//html/Amps/2001-11/msg00263.html (9,096 bytes)
27. [AMPS] Checking out old amp (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Fri, 16 Nov 2001 12:59:07 -0500; Should I worry about damaging the output tube? I need to power up this old 5CX3000A pentode amp in a limited way to proceed with my checkout. I am nowhere near to applying HV and drive yet, but think; /archives//html/Amps/2001-11/msg00284.html (8,025 bytes)
28. [AMPS] Checking out old amp (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Fri, 16 Nov 2001 14:04:36 -0500; Thanks I can easily apply around 1KV to the big tube's plate by jumper from the driver amp's plate power supply. Would that protect it OK? Jerry W4UK -- FAQ on WWW: http://www.contesting.com/FAQ/amps; /archives//html/Amps/2001-11/msg00287.html (9,113 bytes)
29. [AMPS] 5cx1500a information (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Sat, 17 Nov 2001 11:49:14 -0500; Thanks, Skipp. I have full docs on the tube, including the data curves. I also have the EIMAC "care and feeding" book, and their "tube performance computer" is on the way now to me. I also have the m; /archives//html/Amps/2001-11/msg00308.html (10,934 bytes)
30. [AMPS] bright light (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Sat, 17 Nov 2001 20:55:56 -0500; I have powered up this 5cx3000a's filament at full voltage with the blower running to let it age a few hours. I am surprised to see a bright yellow glow down there below the cooling fins. Funny. I as; /archives//html/Amps/2001-11/msg00314.html (9,351 bytes)
31. [AMPS] bright light (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Sat, 17 Nov 2001 22:19:11 -0500; Apparently they use a translucent ceramic. Jerry W4UK -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems:; /archives//html/Amps/2001-11/msg00316.html (8,580 bytes)
32. [AMPS] bright light (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Sun, 18 Nov 2001 10:50:09 -0500; Must be from some kind of corona discharge from the HV. It cannot be from tube/element heat if it is blue. Is ordinary corona blue? Jerry W4UK -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submis; /archives//html/Amps/2001-11/msg00323.html (7,963 bytes)
33. [AMPS] Need HV connectors (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Mon, 19 Nov 2001 11:23:54 -0500; What kind of socket/plug connectors are available for HV these days? I remember years ago guys just used common stuff like the "UHF" coax series, and also Millen made a commercial one. I need to run; /archives//html/Amps/2001-11/msg00330.html (8,040 bytes)
34. [AMPS] Need HV connectors (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Mon, 19 Nov 2001 14:00:08 -0500; My memory on these is hazy - these are color-coded single conductor connectors, right, so the safety of the system is not assured by the + lead alone ? Some connection between chassis to make the neg; /archives//html/Amps/2001-11/msg00339.html (8,174 bytes)
35. [AMPS] Need HV connectors (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Mon, 19 Nov 2001 17:54:38 -0500; Interesting.... Can you get the spark plug wire with a braided shield? Seems like years ago I saw some shielded wire meant to reduce ignition noise in communications vehicles. Maybe shielded spark pl; /archives//html/Amps/2001-11/msg00350.html (8,306 bytes)
36. [AMPS] Special power-up on old unused AL-1200? (score: 1): Author: jflanders2@home.com (Jerry Flanders); Date: Mon, 01 Oct 2001 15:51:33 -0400; My 14 year old AL-1200 (w/internal QSK, bought new from Ameritron back then) has not been powered up for 6-8 years. I was about to power it up to get it working with my new IC-756PRO and it occurred; /archives//html/Amps/2001-10/msg00002.html (7,363 bytes)

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