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21. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 14 Apr 2007 10:14:09 -0400; Hi Tom, switched PA, If we want to be precise, we would have to see in which class the amplifier operates. Hard switched in class C or class E? While the lowest instant voltage depends on the tube sa; /archives//html/Amps/2007-04/msg00117.html (11,592 bytes)
22. Re: [Amps] Tank circuit Q (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 17 Apr 2007 14:54:12 -0400; Hi Gary, It's quite simple, if you look at it analytically, instead of applying cookbook formulas and blindly believing in the results! Unfortunately, many engineering books use the cookbook approach; /archives//html/Amps/2007-04/msg00181.html (12,914 bytes)
23. Re: [Amps] Hertz (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Wed, 18 Apr 2007 10:47:07 -0400; Hi Dana, Rating frequencies in "cycles" is just plain wrong and nonsensical! Rating them in "cycles per second" is correct. "Cycles per minute", or whatever other time unit, would also be correct. By; /archives//html/Amps/2007-04/msg00196.html (8,270 bytes)
24. Re: [Amps] Tank circuit Q (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Wed, 18 Apr 2007 11:41:03 -0400; Hi Peter! The tank coils of real big transmitters are often water cooled! When you already have the water circuit to cool the tubes, it's not that much more effort. I guess you would need some coiled; /archives//html/Amps/2007-04/msg00198.html (8,820 bytes)
25. Re: [Amps] Rehabbing that dusty old (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 23 Apr 2007 02:41:16 +0000; Hi Brian, Sounds like you have a gassy tube. Applying some high voltage through some sort of current limiting device. But it's not simple. You need to apply at least twice the normal high voltage of; /archives//html/Amps/2007-04/msg00227.html (8,833 bytes)
26. Re: [Amps] Rehabbing that dusty old (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 24 Apr 2007 02:14:12 +0000; Hi Steve! Totally different date of manufacture, plate looked different (I don't remember now what exactly was different), and when I tried them, one would take most of the load, the plate getting in; /archives//html/Amps/2007-04/msg00241.html (8,801 bytes)
27. Re: [Amps] rfi (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 01 May 2007 17:29:21 -0400; Hi guys, I'm having a lot of fun reading all those RFI stories. My own experience instead is rather drab! I run legal limit from my apartment, and don't seem to interfere anything at all. I can run t; /archives//html/Amps/2007-05/msg00012.html (8,505 bytes)
28. Re: [Amps] attaching a heat spreader to a heat sink (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 25 May 2007 10:45:55 -0400; Hi guys, with all that talk about heat spreader to heatsink mounting here, I can't help but wonder about how nonsensical it is to make such an copper-to-aluminium sandwich! Why not make the entire he; /archives//html/Amps/2007-05/msg00210.html (10,736 bytes)
29. [Amps] Big transformers? (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 09 Jun 2007 16:29:11 -0400; Hi all, perhaps someone can help me with a purely technical transformer question: I understand that large transformers have to be designed for lower flux density than small ones. Otherwise the core l; /archives//html/Amps/2007-06/msg00045.html (7,240 bytes)
30. Re: [Amps] HV transformer buzzing!! Help Please (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 11 Jun 2007 10:22:27 -0400; Hi Pat, and all! Usually the insulation breaks down from heat degradation. Many of the transformers I have rewound had the paper charred, and the wire insulation flaking off. The laminations will not; /archives//html/Amps/2007-06/msg00069.html (13,123 bytes)
31. Re: [Amps] Big transformers? (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Wed, 13 Jun 2007 18:48:47 -0400; Hi David! Yes, that's right. The problem is that the guys in the store that can sell me transformer laminations have no idea what they are selling. From looking at it, it looks like a decent but not; /archives//html/Amps/2007-06/msg00086.html (10,015 bytes)
32. Re: [Amps] Resistor Types (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 22 Jun 2007 12:29:40 -0400; I agree with Bryan on this. One of the most unreliable type of components is resistors operated at high voltage. In my amp, I discovered bad voltage equalization resistors when the electrolytics sta; /archives//html/Amps/2007-06/msg00111.html (8,725 bytes)
33. Re: [Amps] Resistor Types (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 23 Jun 2007 10:02:43 -0400; Peter, Yes, this is of course a point to keep present. It would never occur to me to make a series string of different diodes, and use them without equalization! But for that matter, I wouldn't use a; /archives//html/Amps/2007-06/msg00122.html (10,466 bytes)
34. Re: [Amps] diodes wanted (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 24 Jun 2007 09:18:13 -0400; Hi Lon, A Google search brings up some sources, but typically they have less than 4 units available, and at a stiff price, 50 to 100 dollars each! These devices seem to be simple five-packs of 1N4007; /archives//html/Amps/2007-06/msg00135.html (7,769 bytes)
35. Re: [Amps] Resistor Types (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 24 Jun 2007 09:38:12 -0400; Hi Peter! Well, I'm not so much a believer in that! I would probably just replace the string with the failed diode, at least if I know a good reason why it failed. If I don't know the reason, I might; /archives//html/Amps/2007-06/msg00136.html (9,730 bytes)
36. Re: [Amps] AL-80A tube glow (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 07 Jul 2007 10:36:45 -0400; Hi Kim! Just an addition to what others have replied: You don't say how much below 2:1 the SWR is. With a PI output, your SWR is probably good enough to be no concern at all, BUT you cannot trust you; /archives//html/Amps/2007-07/msg00068.html (8,533 bytes)
37. Re: [Amps] Amps Digest, Vol 56, Issue 19 (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Wed, 15 Aug 2007 02:16:38 +0000; Hello Sulaiman, John, John has a good point there. I own a NCL-2000, which is working great, but I'm using it on the basis that if I kill the tubes, I will have to build or buy a new amp, because new; /archives//html/Amps/2007-08/msg00099.html (7,760 bytes)
38. Re: [Amps] NCL 2000 Information/Hardware (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Wed, 12 Sep 2007 17:33:07 +0000; Hi Pat, I can send you closeup photos of my NCL-2000 meter faces, if that would be useful to you. Let me know. Manfred. _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2007-09/msg00131.html (6,833 bytes)
39. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 16 Sep 2007 14:52:49 +0000; Hi ye all, I knew about its price and the lack of regulation, but I didn't know that it has such a low efficiency! That's of course unacceptable for a switching power supply. I wouldn't settle for an; /archives//html/Amps/2007-09/msg00166.html (13,305 bytes)
40. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 18 Sep 2007 16:52:31 +0000; Hi David, Sorry for the late reply... My approach to stabilizing power supplies is this: I first design the low pass filter. This starts by deciding the acceptable ripple current in the inductor, whi; /archives//html/Amps/2007-09/msg00199.html (15,666 bytes)

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