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Total 28 documents matching your query.

1. [Amps] CW and High Voltage (score: 1): Author: "Steven Cook" <sccook1@cox.net>; Date: Fri, 2 Sep 2005 22:50:13 -0700; Team, I've acquired an older Henry 2K-4, which only has one High Voltage setting ~ 3500V no load. It runs a pair of 3-500z triodes and will be driven with ~100W My question concerns running the amp a; /archives//html/Amps/2005-09/msg00014.html (7,567 bytes)
2. Re: [Amps] CW and High Voltage (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 3 Sep 2005 02:19:21 -0400; Your latter is best because as you reduce drive, you reduce plate I, which increases the PLI, which needs to see different C1 and C2, assuming that you don't have a roller inductor. Seems to me that; /archives//html/Amps/2005-09/msg00015.html (8,962 bytes)
3. Re: [Amps] CW and High Voltage (score: 1): Author: "Steven Grant, W4IIV" <stevengrant98@yahoo.com>; Date: Sat, 3 Sep 2005 01:09:42 -0700 (PDT); just reduce the exciter drive, the other method is hard on the tubes (excessive plate, and grid current) plus can genorate harmonics Steven I've acquired an older Henry 2K-4, which only has one High; /archives//html/Amps/2005-09/msg00017.html (8,832 bytes)
4. Re: [Amps] CW and High Voltage (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 03 Sep 2005 09:55:35 +0100; Very simplistically, 1 (correctly adjusted) gives you highest efficiency at the expense of gain and linearity. I think 3-500s were designed for class C and continuous operation, so there should be no; /archives//html/Amps/2005-09/msg00018.html (8,790 bytes)
5. Re: [Amps] CW and High Voltage (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sat, 3 Sep 2005 14:01:45 -0500; This is never done under any circumstances on any mode! This is correct for all modes. Because the tank circuit is designed to operate at only one impedance transformation and Q, and it is usually d; /archives//html/Amps/2005-09/msg00024.html (8,734 bytes)
6. Re: [Amps] CW and High Voltage (score: 1): Author: "Steven Cook" <sccook1@cox.net>; Date: Sat, 3 Sep 2005 18:31:22 -0700; Thanks to all for your collective wisdom. I assume manufacturers added the CW position on older amps to meet FCC limits on input power for that mode. Did this serve to maintain circuit Q, or were the; /archives//html/Amps/2005-09/msg00027.html (10,499 bytes)
7. Re: [Amps] CW and High Voltage (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sat, 03 Sep 2005 21:43:02 -0400; Steve, Cutting the drive back too much will indeed cause a good size mismatch and would need to be fine tuned some. The reason being is when the power drops, the plate impedance changes accordingly.; /archives//html/Amps/2005-09/msg00028.html (11,559 bytes)
8. Re: [Amps] CW and High Voltage (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Sat, 03 Sep 2005 23:20:14 -0300; Even when re-tuning the amplifier with low drive, for maximum output, then (for the same plate voltage) the RL will be different from the optimum value for which the Pi tank is designed; you will hav; /archives//html/Amps/2005-09/msg00029.html (13,058 bytes)
9. Re: [Amps] CW and High Voltage (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sat, 03 Sep 2005 22:28:19 -0400; Guillermo, You'd have to tune it for the most power you could get with a compromise of the cleanest obtainable signal. In other words, you want the cleanest signal you can get, but the most power you; /archives//html/Amps/2005-09/msg00030.html (14,447 bytes)
10. Re: [Amps] CW and High Voltage (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sun, 4 Sep 2005 00:53:35 -0500; If you need to cut the drive back far enough to make re-tuning necessary, why not just turn the thing off! People usually use amplifiers because they want to increase the quality of their signal for; /archives//html/Amps/2005-09/msg00032.html (9,058 bytes)
11. Re: [Amps] CW and High Voltage (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 04 Sep 2005 08:07:10 +0100; The tank circuit is an impedance transformer. It converts the load impdance (typ. 50 ohms) to the high resistance presented to the tube plate - typ. 2-4k. If you don't touch the tuning controls, the; /archives//html/Amps/2005-09/msg00033.html (10,464 bytes)
12. Re: [Amps] CW and High Voltage (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sun, 4 Sep 2005 08:44:19 -0400; Not to mention the wear and tear on the amplifier's relays. Bob -- Original Message -- From: "Phil Clements" <philc@texascellnet.com> To: <amps@contesting.com> Sent: Sunday, September 04, 2005 1:53 A; /archives//html/Amps/2005-09/msg00037.html (9,758 bytes)
13. Re: [Amps] CW and High Voltage (score: 1): Author: "Iezzi Family" <slifamily@earthlink.net>; Date: Sun, 4 Sep 2005 09:14:21 -0400; I also have a TL-922. When I first got the Kenwood, I always adjusted for peak power but received reports of poor audio quality. With the help of some pricey lab equipment that I have access to at wo; /archives//html/Amps/2005-09/msg00038.html (12,750 bytes)
14. Re: [Amps] CW and High Voltage (score: 1): Author: R.Measures <r@somis.org>; Date: Sun, 4 Sep 2005 07:17:26 -0700; Amen, Phil. Ego is why people in L. A. buy BMW M3s - even though being able to go from 0 to 60 in 5-seconds really isn't all that useful when the freeway is moving slower than the bicycles on the fro; /archives//html/Amps/2005-09/msg00039.html (10,024 bytes)
15. Re: [Amps] CW and High Voltage (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 04 Sep 2005 11:19:12 -0400; Phil, That's true. I have seen some built though that has a low power using 1/2 plate voltage and those pretty much needs to be retuned too. Of course thats changing the plate voltage not power input; /archives//html/Amps/2005-09/msg00040.html (10,325 bytes)
16. Re: [Amps] CW and High Voltage (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 04 Sep 2005 08:03:23 -0500; It helps to read the FCC Rules. For the 50 years that I've been licensed they have REQUIRED us to use the minimum power needed to maintain communications. And, of course, if done judiciously, it can; /archives//html/Amps/2005-09/msg00041.html (8,602 bytes)
17. Re: [Amps] CW and High Voltage (score: 1): Author: gdaught6@stanford.edu; Date: Sun, 04 Sep 2005 09:13:38 -0700; < snip, snip : other attributions > < more snips > In my opinion, we may be addressing what shouldn't be a problem. What I mean is this: the FIRST TIME I tune a new (or modified) amp, I believe it's; /archives//html/Amps/2005-09/msg00042.html (10,078 bytes)
18. Re: [Amps] CW and High Voltage (score: 1): Author: R.Measures <r@somis.org>; Date: Sun, 4 Sep 2005 10:41:12 -0700; George - When an amplifier is tuned far from resonance, grid-current and, for a tetrode or pentode, screen-current is virtually zero. In a properly designed amplifier, the grid and screen are fused w; /archives//html/Amps/2005-09/msg00043.html (11,238 bytes)
19. Re: [Amps] CW and High Voltage (score: 1): Author: R.Measures <r@somis.org>; Date: Sun, 4 Sep 2005 10:43:58 -0700; Isn't it reasonable communication -- i. e., you run enough not to have to repeat each sentence more than 5-times? Richard L. Measures, AG6K, 805.386.3734. www.somis.org ______________________________; /archives//html/Amps/2005-09/msg00044.html (7,207 bytes)
20. Re: [Amps] CW and High Voltage (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sun, 4 Sep 2005 15:45:58 -0500; This did nothing but allow the amp to pass type-acceptance from the FCC. Dipping and peaking went out years ago with class C! You are showing your age! You shouldn't be fooling around with tune and; /archives//html/Amps/2005-09/msg00045.html (9,851 bytes)

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