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21. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 05 Oct 2013 11:44:02 -0700; Thanks to every one on their suggestions. It seems that multiple T200-2 cores are the most common. - Paul _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2013-10/msg00056.html (7,875 bytes)
22. [Amps] GS35B Idle Current drifting up. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 18 Dec 2013 11:48:07 -0800; I've been running a GS35B for a year or so. Initially with B+ at 4KV I had the bias voltage set at 30V and an idle current of 200mA. The idle current has been slowly drifting up over time. Now it tak; /archives//html/Amps/2013-12/msg00133.html (7,814 bytes)
23. Re: [Amps] GS35B Idle Current drifting up. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 19 Dec 2013 08:37:03 -0800; It's a real 50V - Paul Carl KM1H I've been running a GS35B for a year or so. Initially with B+ at 4KV I had the bias voltage set at 30V and an idle current of 200mA. The idle current has been slowly; /archives//html/Amps/2013-12/msg00137.html (9,562 bytes)
24. Re: [Amps] GS35B Idle Current drifting up. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 20 Dec 2013 12:58:22 -0800; I don't know much about the inside of tubes, but it seems to me that if the grid was getting smaller then it would take a large negative voltage to stop those electrons getting to the plate. The real; /archives//html/Amps/2013-12/msg00143.html (7,518 bytes)
25. Re: [Amps] Runaway Plate Current (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 30 Dec 2013 07:35:04 -0800; Can you bias a Tetrode off like a Triode with a large resistor in the Cathode? - Paul Because of negative screen current, an active (rather than VR tubes or zeners) shunt regulator is best, and not d; /archives//html/Amps/2013-12/msg00183.html (7,929 bytes)
26. Re: [Amps] Fake and Counterfeit Chinese Transistors 2SC3133 (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 31 Dec 2013 12:35:38 -0800; I purchased some IC's from Hong Kong that were fake. I complained to the seller and he immediately sent me some more, which were also fake. Based on that I'm pretty sure he didn't know they were fake; /archives//html/Amps/2013-12/msg00245.html (9,870 bytes)
27. [Amps] High Voltage Transformer(s) wanted (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 01 Jan 2014 14:51:54 -0800; High Voltage Transformer wanted: I am looking for a transformer that when rectified and cap filtered will provide about 2KV at .8A or two transformers where one will provide 2KV at .5A and the second; /archives//html/Amps/2014-01/msg00001.html (6,642 bytes)
28. Re: [Amps] High Voltage Transformer(s) wanted (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 01 Jan 2014 18:24:04 -0800; According to the American Website that trany is 1500V @ .5A, so the 1500V should give 2KV DC, but I need about .8A for this AM project. You are right, the price is very good. - Paul Carl KM1H High Vo; /archives//html/Amps/2014-01/msg00003.html (9,038 bytes)
29. Re: [Amps] High Voltage Transformer(s) wanted (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 01 Jan 2014 18:38:58 -0800; The manual for the AL811 says the supply is 1500V at .7A, which doesn't agree well with the Ameritron trany spec. If it was 2KV at .7A it would be perfect. - Paul You are right, the price is very goo; /archives//html/Amps/2014-01/msg00004.html (9,290 bytes)
30. Re: [Amps] Electrolytic Substitutions (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 16 Jan 2014 20:35:23 -0800; K4POZ sells 390uF/450V 105deg on QTH.COM. I've bought many for amps and never had an issue. His are 2.50 each. - Paul At 07:47 PM 1/16/2014, you wrote: I am repairing an Alpha 87A and need 7 HV filte; /archives//html/Amps/2014-01/msg00082.html (7,999 bytes)
31. Re: [Amps] MOVs (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 23 Jan 2014 07:18:46 -0800; If the amp is running off 240V where in the USA this is symmetrical about ground and then the MOV is placed between the two phases, it seems to me that there would not be a surge current to ground. -; /archives//html/Amps/2014-01/msg00224.html (9,355 bytes)
32. [Amps] Non-linear linear (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 30 Jan 2014 16:42:50 -0800; I have a problem with my home brew HF linear being non linear on one band. On 80, 40, 20, 12 and 10 with 75W drive my linear will give about 1500W output. If I reduce the input power by 9.5dB the out; /archives//html/Amps/2014-01/msg00327.html (8,110 bytes)
33. Re: [Amps] Non-linear linear (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 31 Jan 2014 11:51:36 -0800; Well ignore everything I said. It's a measurement error. I was assuming the input SWR was relatively constant with power levels and basing my input power variation on a voltage measurement on the sco; /archives//html/Amps/2014-01/msg00350.html (9,496 bytes)
34. Re: [Amps] Plate Voltage Not Stable (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 15 Feb 2014 15:00:56 -0800; First thing would be to read the high voltage on some other device. The problem could be the dropping resistor(s) on the meter. If it is low and does wiggle, then next measure the AC. Very unlikely t; /archives//html/Amps/2014-02/msg00137.html (8,572 bytes)
35. Re: [Amps] L4B supply (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 16 Feb 2014 14:16:28 -0800; I run my L4-B at 800V (no load) above the original design. 3100V key down at .7A.1600W PEP out. It's been handling it fine for about 6 months now. I think the cooling is probably inadequate but I lik; /archives//html/Amps/2014-02/msg00156.html (8,824 bytes)
36. Re: [Amps] L4B supply (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 16 Feb 2014 18:58:31 -0800; I replaced the original with the Ameritron one. It's a little tall so I added an insulator at the top otherwise a little pressure on the case would short it out. No arcs or sparks on any band includi; /archives//html/Amps/2014-02/msg00159.html (7,444 bytes)
37. Re: [Amps] Drake (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 20 Feb 2014 07:12:54 -0800; As in most Grounded Grid Amplifiers the Drake requires that B- is allowed to float from ground. If your B- is connected directly to ground (chassis) the metering system will not work. You need to che; /archives//html/Amps/2014-02/msg00180.html (8,056 bytes)
38. Re: [Amps] ACOM2000a problem (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 07 May 2014 16:19:28 -0700; Email Stan at ACOM. acom@mail.orbitel.bg He will tell you what to do. - Paul At 08:44 AM 5/3/2014, Andrius Ignotas wrote: Hello Need suggestions. Got ACOM 2000A. During startup at 139 sec message ape; /archives//html/Amps/2014-05/msg00019.html (7,811 bytes)
39. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 30 Oct 2014 09:48:17 -0700; One nice thing about home brewing a grid driven tetrode amp with the GU74B is that you don't need a tuned input, just a 50 Ohm resistor. With 2 tubes, 50-60W drive gives you 1500W out. With suitable; /archives//html/Amps/2014-10/msg00257.html (10,767 bytes)
40. Re: [Amps] L4B biasing (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 24 Dec 2014 13:23:12 -0800; Yes you should add bias. I added 11 diodes in the center tap of the filament trany. So that would be about 7 volts. - Paul .At 12:52 PM 12/24/2014, you wrote: I just finished me Drake power supply. I; /archives//html/Amps/2014-12/msg00097.html (8,047 bytes)

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