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1. Re: [Amps] Dummy Load "Oil" (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 29 Jul 2009 20:11:36 +0000; Hi Dick, When I built my kilowatt-level dummy load, roughly ten years ago, in the style of the venerable Heathkit CanTenna, I filled it with Shell Thermia oil. The Shell distributor in my area would; /archives//html/Amps/2009-07/msg00365.html (8,329 bytes)
2. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 05 Aug 2009 02:12:40 +0000; Hi David, Plate BYPASS capacitor? Is that circuit a cathode follower? Otherwise there shouldn't be a plate bypass capacitor! Perhaps you mean a plate COUPLING capacitor? Most certainly yes. A 0.1uF c; /archives//html/Amps/2009-08/msg00082.html (8,328 bytes)
3. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 05 Aug 2009 19:43:25 +0000; Hi David, I would have called that a power supply bypass capacitor, or to be clearer, a plate supply bypass capacitor. Anyway, now it's clear what you mean. When in doubt, it's best to calculate what; /archives//html/Amps/2009-08/msg00087.html (9,700 bytes)
4. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 06 Aug 2009 20:05:32 +0000; Hi David, Bill, Yes, indeed when the voltage is lower, and the power level is the same, the necessary bypass capacitance gets larger to the square of the voltage ratio. Whether the voltage is obtaine; /archives//html/Amps/2009-08/msg00098.html (9,960 bytes)
5. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 07 Aug 2009 02:00:19 +0000; Bill, Not so...! I just checked datasheets for the 6146 (no suffix), for the 6146A and the 6146B, from RCA and GE. They all agree on the plate voltages: 600V in CCS, and 750V in ICAS! The 400V rating; /archives//html/Amps/2009-08/msg00111.html (9,624 bytes)
6. Re: [Amps] Manganin RF choke? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 09 Aug 2009 18:30:57 +0000; Hi Colin, I haven't heard that idea before, but it is very common to place a resistor in parallel with a choke, to lower its Q and discourage self-oscillations. At least in solid state VHF amplifiers; /archives//html/Amps/2009-08/msg00160.html (7,365 bytes)
7. Re: [Amps] plate bypass capacitor (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 10 Aug 2009 16:55:58 +0000; Hi Gary, and all, I feel an irresistible pull to add my few cents again to this thread! It's correct that the load impedance and not the capacitor impedance is the base, but the 10 times factor is pu; /archives//html/Amps/2009-08/msg00235.html (15,038 bytes)
8. Re: [Amps] SGC-Mini Lini (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 12 Aug 2009 01:55:15 +0000; When I joined this list a few years ago, it was in search of information and perhaps help regarding an envelope-restored amp I was trying to develop. It's funny that only now I learn about the Mini L; /archives//html/Amps/2009-08/msg00271.html (10,684 bytes)
9. Re: [Amps] Class E Distortion Reduction (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 13 Aug 2009 00:04:27 +0000; Marv, Oh yes, I'm watching them closely! Both for their linear and switchmode RF FETs. I believe these are the best at the time. Their fastest ones would already be good enough to work in class D on; /archives//html/Amps/2009-08/msg00294.html (8,471 bytes)
10. Re: [Amps] IC-2KL 80m toroid value (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 29 Oct 2009 12:35:16 +0000; And for a good reason: Iron powder materials span the range of permeability needed to easily build compact, low cost, low loss, temperature-stable, high Q inductors ranging from a fraction of one uH; /archives//html/Amps/2009-10/msg00349.html (9,327 bytes)
11. Re: [Amps] Conservation of Energy! (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 06 Dec 2009 18:56:41 +0000; The dumbness around can be astonishing. In my neck of the woods (Chile), there is a new fashion among hams. They found out that 100 watt radios don't produce a constant 100W output on SSB, but do so; /archives//html/Amps/2009-12/msg00180.html (9,410 bytes)
12. Re: [Amps] transformer duty cycle (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 10 Dec 2009 13:14:32 +0000; Hi Felipe, I would say that for normal SSB and CW work, even 30% would be enough! But if you want to use that kind of speech processor that pegs the needle with background noise, then you need more,; /archives//html/Amps/2009-12/msg00262.html (9,434 bytes)
13. Re: [Amps] What are the drawbacks of using a tube running, relatively low voltage and high current? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 07 Jan 2010 16:00:25 +0000; Roger, I would say that using a lower plate voltage affects these components POSITIVELY! Since the tube's capacitance stays the same, the lower load impedance resulting from the lower voltage and hig; /archives//html/Amps/2010-01/msg00044.html (9,794 bytes)
14. Re: [Amps] KK5DR's ferrite loaded plate chokes. (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 17 Jan 2010 16:02:35 +0000; Jim, Yes. 43 material is an extremely bad choice for that application. This material's best application is actually for absorption purposes, when fighting RFI! It can also be used quite well in low i; /archives//html/Amps/2010-01/msg00241.html (14,137 bytes)
15. Re: [Amps] KK5DR's ferrite loaded (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 19 Jan 2010 15:50:08 +0000; Hi Jim, That's right, but in many cases this capacitance is still irrelevant. Even when it causes a resonance inside the band of interest, which it often does indeed, this is at such a high level of; /archives//html/Amps/2010-01/msg00255.html (13,625 bytes)
16. Re: [Amps] KK5DR's ferrite loaded (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 22 Jan 2010 19:23:35 +0000; Angel, I'm not saying that it won't ever be better. I'm just saying that a ferrite loaded choke might not necessarily be the better solution in every case! It's certainly possible to make plate choke; /archives//html/Amps/2010-01/msg00278.html (12,148 bytes)
17. Re: [Amps] Silk screen alternatives (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 30 Jan 2010 14:32:14 +0000; My approach to front panel labelling is simple and straightforward: I don't! After all, only I will operate that equipment, and after designing and building it, I should know pretty well which knob d; /archives//html/Amps/2010-01/msg00505.html (7,908 bytes)
18. Re: [Amps] Silk screen alternatives (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 31 Jan 2010 13:50:16 +0000; Bill, So you still use MANUAL band switching, in this time and age? A decent 21st century amp should absolutely have automatic bandswitching!!! This nicely circumvents the need for labelling! ;-) Man; /archives//html/Amps/2010-01/msg00567.html (7,683 bytes)
19. Re: [Amps] winding xformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 09 Feb 2010 18:24:04 +0000; Hi Morrie, I just sent you an Excel spreadsheet I use for designing my transformers, by direct e-mail. The purpose of this short message here is just to let you know about it, should my direct messag; /archives//html/Amps/2010-02/msg00282.html (7,807 bytes)
20. [Amps] For Rex Lint (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 15 Feb 2010 01:12:36 +0000; Rex, my direct mail to you with the transformer design spreadsheet bounces back, regardless what I try. Do you have any other e-mail address? All the other recipients seem to be OK. If anyone else wh; /archives//html/Amps/2010-02/msg00391.html (6,571 bytes)

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