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1. [Amps] Power supply design considerations (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Tue Jul 1 09:49:16 2003; Jim, et. al., For HV insulated wire go to a neon sign company. They typically have rolls of very wiring in 14 gauge with 15KV insulation or better. I was given some 3 foot scraps from a field install; /archives//html/Amps/2003-07/msg00173.html (9,900 bytes)
2. [Amps] Sb-200 plate current (again) (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sun Jun 15 09:21:08 2003; Hi Jeff, etc., I lost one of those resistors many years ago. I would say old age. Maybe some stray current, but I replaced the 33 ohm 1W with 33 ohm 2 Watt resistors. One of my tubes was not working; /archives//html/Amps/2003-06/msg00099.html (8,682 bytes)
3. [Amps] transformer rating (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Wed Jun 18 08:12:35 2003; Dear Ken, etc., I think there are three ways to do the project: 1. add a dropping resistor to get the primary from about 120 volts down to 100 volts. Since 9 volts @ 50 amps is 450 watts and 7.5 volt; /archives//html/Amps/2003-06/msg00121.html (8,189 bytes)
4. [Amps] 3CX400A7/8874 ??? (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Thu Jun 19 08:31:43 2003; Hi Art: Yes an 8874 requires warm up time. I think it is 60 seconds, but could be 90 seconds, not more. Alpha 76 and 78 owners will know. 73 George K8GG question.; /archives//html/Amps/2003-06/msg00132.html (7,453 bytes)
5. [Amps] Heathkit SB-230 manual?? (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Mon May 19 08:41:15 2003; Hello Mark, etc. Emtron did not have a booth at Dayton this year. The only "big" amp I saw was a commercial Italian one marked "not for sale" or something to that effect. 73 George K8GG; /archives//html/Amps/2003-05/msg00133.html (7,768 bytes)
6. [Amps] 2:1 Transformer (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Tue May 27 08:40:30 2003; Dear Yuri, etc: We have been using 240-61 cores for KW transformers on 160 meters. So, I would use something like a one inch core, 61 material for 200 watts or so. Trifilar winding, with 5 to 7 turns; /archives//html/Amps/2003-05/msg00200.html (8,453 bytes)
7. [Amps] SB-200 HV meter problem (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sat Apr 5 08:28:04 2003; Dear Sam, et. al., The high voltage is read from a voltage divider R3 and R4 which go from the high voltage wiring to ground. The connection between R3 and R4 is wired to terminal 11 on the meter swi; /archives//html/Amps/2003-04/msg00036.html (8,564 bytes)
8. [Amps] SB-200 Question (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sat Apr 5 23:28:38 2003; Sam: If you have one open and a second one with too much resistance, then replace all three. The third one can't be very much better. Rich commented on what type resistor is best. 73 George K8GG; /archives//html/Amps/2003-04/msg00051.html (8,018 bytes)
9. [Amps] Question about ampifiers (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Mon Apr 14 08:20:54 2003; Gentlemen: The Y connection is probably designed for 220 across two poles with a single leg to ground of 127 VAC, similar to Curacao. It works fine on amplifiers, and some of the locals and contester; /archives//html/Amps/2003-04/msg00135.html (9,787 bytes)
10. [Amps] B&W 850A Plate Tank (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sun Mar 23 08:59:08 2003; Hi All, I have a B&W 850A plate tank/switch assembly for sale. Very good/clean. Previous owner moved 40 meter tap two turns in toward 20. Will ship CONUS via USPS or UPS for $90. Digital pictures ava; /archives//html/Amps/2003-03/msg00788.html (6,342 bytes)
11. [Amps] SB200 tuned input (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Wed Mar 26 14:52:28 2003; Dear Bruce, et. al., I looked up my SB-200 notes and found the following. The input circuits are L-networks on 80, 15 & 10, The input circuits are Pi-networks on 20 & 40. For all the input circuits I; /archives//html/Amps/2003-03/msg00850.html (9,860 bytes)
12. [Amps] Re: National R-175 Choke (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sat Mar 29 08:19:57 2003; Gentlemen: I thought the reason National went to R-175A was to avoid a 15 meter resonance in the R-175. I think they are both 1950s vintage, although the R-175 might have been made in the late 1940s.; /archives//html/Amps/2003-03/msg00919.html (8,030 bytes)
13. [Amps] Heathkit SB-220/221 HV Transformer (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sat Aug 2 17:17:52 2003; Jim, et. al. A Heathkit amplifier Power Supply is a voltage doubler. The winding is rated for 1170 VAC at 1 amp CCS with 234 VAC on the primary windings. Using a voltage doubler, it gives about 3250; /archives//html/Amps/2002-09/msg00292.html (8,873 bytes)
14. [Amps] Alpha 78 For Sale (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sat Aug 2 17:17:54 2003; Very nice Alpha 78 amplifier, full power output, S/N 8003, full QSK, new front panel. Broadband tuning 80 - 15 meters, manual tuning 160 - 10 meters, including 30 & 17. $1500.00 Shipping negociable.; /archives//html/Amps/2002-09/msg00295.html (6,377 bytes)
15. [Amps] Difference between Heathkit SB-200 and SB-201? (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Sun Aug 17 09:06:20 2003; Hi Dave, et al, The major difference between an SB-200 & SB-201 is the blocking of 10 meters on the "201". The kit came with either no 10 meter input components or a low pass filter in the cathode ci; /archives//html/Amps/2002-09/msg00383.html (8,199 bytes)
16. [Amps] Need info on 8874's (score: 203): Author: gmguerin at voyager.net (George & Marijke Guerin); Date: Mon Aug 18 08:19:27 2003; Hi Bob, I guess I would call or e-mail Eimac and see what they recommend for a cleaner. I am sure you can find them if you do a Google search. As to the date codes, I believe the first part is a plan; /archives//html/Amps/2002-09/msg00394.html (8,657 bytes)

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