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21. [AMPS] Re: PA Measurments (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Thu, 14 May 1998 12:01:28 +0000; A recent post implied, incorrectly, that measurements of a HF PA are difficult to make. There is no basis for such claims. These aren't GHz band measurements of complex systems. They don't require SM; /archives//html/Amps/1998-05/msg00229.html (8,722 bytes)
22. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 18 May 1998 16:40:37 +0000; To: <amps@contesting.com> I assume you mean the time varying resistance of the anode as modified by stray reactances. The tubes anode system, so far as that time-varying resistance, does not come int; /archives//html/Amps/1998-05/msg00324.html (11,803 bytes)
23. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 07:24:49 +0000; To: <amps@contesting.com> Rich replied: There seem to be a few flaws in that method. The most evident is that GDO's "pull" quite a bit. If you do use a GDO and see a dip, it still tells you nothing a; /archives//html/Amps/1998-05/msg00337.html (9,864 bytes)
24. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 07:24:49 +0000; To: <amps@contesting.com> Hi Jon, Can you explain how lower Rp in the suppressor produces less VHF gain? If lower Rp means LESS gain, why use a suppressor Jon? What is the Rp of a dead short? There i; /archives//html/Amps/1998-05/msg00338.html (10,740 bytes)
25. [AMPS] Gassy Tubes and Gas Arcs (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 07:24:49 +0000; To: <amps@contesting.com> Not only that, a gassy tube can also have no observable glow between the elements and still arc! Outgassing from elements is common (especially with graphite anode tubes), s; /archives//html/Amps/1998-05/msg00339.html (9,359 bytes)
26. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 07:24:50 +0000; To: <amps@contesting.com> Just got home to the unfriendly reflector. Hopefully I won't miss anything by deleting MOST of the 198 messages from this and one other reflector without reading them! No on; /archives//html/Amps/1998-05/msg00340.html (9,847 bytes)
27. [AMPS] Resonances (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 07:24:49 +0000; To: <amps@contesting.com> Bolt it to a groundplane, and measure the connection with the shortest lead possible. In my test, I measured the actual component used in its operating location. If you meas; /archives//html/Amps/1998-05/msg00341.html (8,520 bytes)
28. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 09:37:46 +0000; To: <amps@contesting.com> Hi Larry, That is a much better (although longer) way of saying what I meant. Being "crystal clear" is difficult without peer review. I appreciate your insight. In fairness,; /archives//html/Amps/1998-05/msg00345.html (11,860 bytes)
29. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 19 May 1998 09:37:47 +0000; To: <amps@contesting.com> Hi Jim, You replied: Hold on there Jon. There is enough of this personal attack BS on this reflector. My general policy is when I see such insulting dribble, I delete the po; /archives//html/Amps/1998-05/msg00346.html (12,680 bytes)
30. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 07:13:04 +0000; To: <amps@contesting.com> Hi Jon, I assume you are talking about voltage gain, and not power gain. When the tube is delivering power and consuming power from the driver, more plate load resistance ca; /archives//html/Amps/1998-05/msg00375.html (12,010 bytes)
31. [AMPS] Technical Question #1 (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 07:13:04 +0000; To: <amps@contesting.com> Unless you have details of the second hand report and are absolutely sure of the source, we have to dismiss it. Carl, consider the large conclusion you are leaping to here i; /archives//html/Amps/1998-05/msg00376.html (9,200 bytes)
32. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 07:13:04 +0000; To: <amps@contesting.com> Right, that's why I gave them as examples. A pair of 572B's, such as used in the Yaesu amp, will oscillate at the operating frequency if load is removed from the input and o; /archives//html/Amps/1998-05/msg00377.html (12,029 bytes)
33. [AMPS] Technical Question #1 (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 08:40:09 +0000; To: <amps@contesting.com> Rich, I'll speak for myself, since I am here. I never told you I saw damage from *VHF* oscillations in SB-220's. By far the largest sources of damage were equipment abuse an; /archives//html/Amps/1998-05/msg00378.html (8,534 bytes)
34. [AMPS] 3CX800s in MLA-2500 (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 08:40:09 +0000; To: <amps@contesting.com> Hi Dave, Another thing to consider is two tubes require less airflow than a single tube, for a given output power in a given circuit. I doubt people are going to have enough; /archives//html/Amps/1998-05/msg00379.html (7,948 bytes)
35. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 08:40:09 +0000; To: <amps@contesting.com> But you can easily build the necessary barbaric equipment. The source does not need to be swept or accurately leveled if you plot points and look for coupling maximums. For; /archives//html/Amps/1998-05/msg00380.html (11,495 bytes)
36. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 10:58:11 +0000; To: <amps@contesting.com> Hi Bill, The suggestion is that a resistor be used to provide current limiting for faults, and to provide overcurrent protection in operation. The most harmful part of that; /archives//html/Amps/1998-05/msg00382.html (10,748 bytes)
37. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 23:01:29 +0000; To: <amps@contesting.com> Hi Carl, You miss my point. My point is you are using assumptions to set up an unbendable scenario, and demanding an answer without giving the facts I requested. Do you know; /archives//html/Amps/1998-05/msg00407.html (9,444 bytes)
38. [AMPS] Re: Parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 23:01:30 +0000; To: <amps@contesting.com> Hi Carl, I caught that after I posted it, of course it was not a linear amp. I forgot the nit picking that goes on in the "friendly reflector", I should spend another half h; /archives//html/Amps/1998-05/msg00408.html (9,257 bytes)
39. [AMPS] parasitics (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 23:01:30 +0000; To: <amps@contesting.com> Anything that causes excess grid current can damage the grid. That includes oscillations as well as fundamental frequency drive...or even dc. Once the failure happens and th; /archives//html/Amps/1998-05/msg00409.html (12,068 bytes)
40. [AMPS] Generic: low out on 10m (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 20 May 1998 23:01:30 +0000; To: <amps@contesting.com> Hi Scott. I'll give you the top five, in order of likelihood. 1.) The tank does not hit resonance. 2.) The choke is series resonant 3.) The input circuit is placed remotely; /archives//html/Amps/1998-05/msg00410.html (8,044 bytes)

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