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1. [AMPS] Amp using 833A (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Sun, 17 Sep 2000 21:24:05 -0400; Anyone ever build or use an amp employing the 833A ? rated for class B RF amplifier service. Might be fun for a nostalgia CW amp, but anyone ever use this tube for SSB ? Phil -- FAQ on WWW: http://ww; /archives//html/Amps/2000-09/msg00826.html (7,619 bytes)
2. [AMPS] Amp using 833A (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sun, 17 Sep 2000 21:41:58 -0400; I'd make a lamp out of it. Mark WB8JKR On Sun, 17 Sep 2000 21:24:05 -0400 "Phil (VA3UX)" <phil@vaxxine.com> writes: ________________________________________________________________ YOU'RE PAYING TOO; /archives//html/Amps/2000-09/msg00827.html (8,787 bytes)
3. [AMPS] Amp using 833A (score: 1): Author: 2@vc.net (measures); Date: Sun, 17 Sep 2000 19:25:22 -0700; sound advice, Mark The Mu is too low for g-g service. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administ; /archives//html/Amps/2000-09/msg00828.html (8,170 bytes)
4. [AMPS] Amp using 833A (score: 1): Author: kc4slk@csrlink.net (Mike Sawyer); Date: Sun, 17 Sep 2000 22:35:26 -0400; Phil, I seem to remember that several years ago, in the magazine "Electric Radio", one writer built a "Flea Market Gallon", using an 833. It was in January, '98 issue. The author was Berkemeyer. You; /archives//html/Amps/2000-09/msg00829.html (8,700 bytes)
5. [AMPS] Amp using 833A (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Sun, 17 Sep 2000 22:43:22 -0400; A Lamp ! As in class "L" -AMP ? I think I got it ! Actually Mark the lamp idea did occur to me. Phil -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative; /archives//html/Amps/2000-09/msg00830.html (8,078 bytes)
6. [AMPS] Amp using 833A (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 18 Sep 2000 01:15:07 EDT; On Sun, 17 Sep 2000 21:24:05 -0400 "Phil (VA3UX)" <phil@vaxxine.com> writes: only Hi Phil, The 1980 ARRL Handbook showcases (it's on the cover!) that tube in a linear amp which represents a retreat i; /archives//html/Amps/2000-09/msg00835.html (8,705 bytes)
7. [AMPS] Amp using 833A (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Tue, 19 Sep 2000 20:14:14 -0400; This is a sad day in amateur radio. Here we are in a mail list for the high end of the amateur radio building community and we're reluctant to use a tube that requires bias!? 4-1000's look ok when gl; /archives//html/Amps/2000-09/msg00843.html (9,526 bytes)
8. [AMPS] Amp using 833A (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 18 Sep 2000 21:10:47 -0400; Hi Jeff The problem is the tube will have low gain. That's because the gain of a grounded grid PA is related to the ratio of output impedance to input impedance of the tube. With it's low-mu construc; /archives//html/Amps/2000-09/msg00845.html (9,464 bytes)
9. [AMPS] Amp using 833A (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Mon, 18 Sep 2000 21:09:58 -0400; Not to worry Jeff. I pretty much ignored the reply you refer to below. Grounded grid never even entered my mind with respect to this tube. It was Rich that chose to reply in a one-sided manner regard; /archives//html/Amps/2000-09/msg00846.html (10,788 bytes)
10. [AMPS] Amp using 833A (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Mon, 18 Sep 2000 21:22:43 -0400; Now this is little more useful. Thanks for the input Tom. As I mentioned to Jeff, g-g would not be considered for this tube. Neither would upper HF (these things are only rated for 30 Mhz max anyway); /archives//html/Amps/2000-09/msg00847.html (10,251 bytes)
11. [AMPS] Amp using 833A (score: 1): Author: 2@vc.net (measures); Date: Mon, 18 Sep 2000 18:44:32 -0700; The bad news is that the Mu is too low for the 833 to be driven with a reasonable amount of power. Like 304TLs and 304THs, 833s are bits of history. cheers - Rich..., 805.386.3734, www.vcnet.com/mea; /archives//html/Amps/2000-09/msg00848.html (10,700 bytes)
12. [AMPS] Amp using 833A (score: 1): Author: 2@vc.net (measures); Date: Mon, 18 Sep 2000 19:04:25 -0700; ? Not in linear service, Mr. Rauch. Medium Mu triodes draw little anode current unless the grid is driven way positive- and that means distortion. The only kind of triode that is suitable for grid d; /archives//html/Amps/2000-09/msg00850.html (10,160 bytes)
13. [AMPS] Amp using 833A (score: 1): Author: 2@vc.net (measures); Date: Mon, 18 Sep 2000 19:04:27 -0700; Perfect. No VHF suppressor needed. Better wear a goalie mask to the next convention, Phil - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submi; /archives//html/Amps/2000-09/msg00851.html (8,981 bytes)
14. [AMPS] Amp using 833A (score: 1): Author: 2@vc.net (measures); Date: Mon, 18 Sep 2000 19:04:28 -0700; G-G is the only game in town because the 833 simply does not draw enough peak anode current when the grid is at 0v. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.con; /archives//html/Amps/2000-09/msg00852.html (11,883 bytes)
15. [AMPS] Amp using 833A (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Tue, 19 Sep 2000 22:09:03 -0400; Tom's probably got the best point about high IMD without the cathode negative feedback. He's also right about high gain, instability, long leads and oscillation at HF. That being said, it's fairly ea; /archives//html/Amps/2000-09/msg00853.html (12,999 bytes)
16. [AMPS] Amp using 833A (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Mon, 18 Sep 2000 22:21:37 -0400; Yes, I expect I could receive more than the daily allowance of vegetable and dairy products at such a gathering if I wasn't careful with the design. Phil -- FAQ on WWW: http://www.contesting.com/FAQ/; /archives//html/Amps/2000-09/msg00854.html (9,137 bytes)
17. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 09:32:00 +0100; This is not necessarily so. Class AB2 or Class B2 operation with grid current in grounded cathode requies a well regulated bias supply, and a well regulated drive, but it does NOT automatically mean; /archives//html/Amps/2000-09/msg00855.html (9,251 bytes)
18. [AMPS] Amp using 833A (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 19 Sep 2000 04:52:30 -0400; Not necessarily true. Tubes with low operating frequency limits are almost always the worst tubes to stabilize. The reason the max operating frequency is so low is because the leads are long and some; /archives//html/Amps/2000-09/msg00856.html (9,218 bytes)
19. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 09:59:08 +0100; Which is why 572s are such a problem. One of the applications for the 833 was in RF heating, usually as a power oscillator at 27MHz. Regardless of that, I suspect that parasitic suppression when oper; /archives//html/Amps/2000-09/msg00857.html (8,949 bytes)
20. [AMPS] Amp using 833A (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 19 Sep 2000 05:01:01 -0400; I think this goes back to arguments in the past Peter, where Rich felt that: Any positive grid to cathode potential = unacceptable distortion That equation isn't true in many if not most cases. The w; /archives//html/Amps/2000-09/msg00858.html (9,700 bytes)

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