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21. Re: [Amps] 813 efficiency (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 23 Feb 2013 11:09:21 -0500; For about the same money there are still many 4-250A and 400A's available. Carl KM1H Hi Guys, It absolutely gobsmacks me how some guys in this hobby would rather whip-out the ol' VISA card & spend li; /archives//html/Amps/2013-02/msg00215.html (9,937 bytes)
22. [Amps] 813 efficiency (score: 1): Author: "Mike Lord" <k4elv@bellsouth.net>; Date: Sat, 23 Feb 2013 14:07:45 -0600; I just wanted to take a moment to thank all who took the time to respond to my query. The response was amazing. So much information and ideas were shared. I feel like I have a much better understandi; /archives//html/Amps/2013-02/msg00218.html (8,007 bytes)
23. Re: [Amps] 813 efficiency (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 23 Feb 2013 15:44:26 -0500; Might be incentive for those remaining to learn at least basic electronics...Nah, this is the entitlement generation. The survivors would expect the electrons to learn their lesson and the family wou; /archives//html/Amps/2013-02/msg00219.html (11,005 bytes)
24. Re: [Amps] 813 efficiency (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Sat, 23 Feb 2013 14:19:54 -0800; REPLY: To get the plate dissipation of a single 8877 would take 12 813s. Would you put them all in a row? Or a matrix of 3x4? Or 6x2? Or maybe in a circle? Can't wait to hear. :-) Bill, W6WRT _______; /archives//html/Amps/2013-02/msg00221.html (8,920 bytes)
25. [Amps] 813 efficiency (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 25 Feb 2013 04:11:04 -0800; Because the tuning on the lower bands was radically altered with it in, far & away removed from quoted "text book specs" for a pair of 813s in GG... ~73~ de Eddy VE3CUI VE3XZ lower bands ? The most i; /archives//html/Amps/2013-02/msg00223.html (9,366 bytes)
26. Re: [Amps] 813 efficiency (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Mon, 25 Feb 2013 06:52:21 -0800; At age 16, my 1500 volt, power supply was sitting atop my desk with no protection - 836 tubes exposed. The back of my hand hit the cap and I was flung about 15 feet across the room and crashed into m; /archives//html/Amps/2013-02/msg00224.html (8,737 bytes)
27. Re: [Amps] 813 efficiency (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Mon, 25 Feb 2013 06:58:54 -0800; REPLY: To get the plate dissipation of a single 8877 would take 12 813s. Would you put them all in a row? Or a matrix of 3x4? Or 6x2? Or maybe in a circle? Can't wait to hear. :-) Good question. With; /archives//html/Amps/2013-02/msg00225.html (9,563 bytes)
28. Re: [Amps] 813 efficiency (score: 1): Author: Eddy Swynar <deswynar@xplornet.ca>; Date: Mon, 25 Feb 2013 10:00:26 -0500; Hi Bill, I am obviously missing something here: why would you want to maximize plate DISSIPATION, anyway...?! I grew up always believing that the first goal in ANY amplifier was the maximizing of pla; /archives//html/Amps/2013-02/msg00226.html (10,049 bytes)
29. Re: [Amps] 813 efficiency (score: 1): Author: Eddy Swynar <deswynar@xplornet.ca>; Date: Mon, 25 Feb 2013 10:09:13 -0500; Have you ever actually tried tuning the amp BOTH ways, Jim...? If you haven't, please do--and be prepared to be amazed. Ditto above, Jim! I can only share with you my own personal real-world experien; /archives//html/Amps/2013-02/msg00227.html (8,692 bytes)
30. Re: [Amps] 813 efficiency (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 25 Feb 2013 10:43:14 -0500; It absolutely gobsmacks me how some guys in this hobby would rather whip-out the ol' VISA card & spend literally HUNDREDS on power amplifier tubes, when the lowly ol' 813--paired with some twins, of; /archives//html/Amps/2013-02/msg00229.html (10,587 bytes)
31. Re: [Amps] 813 efficiency (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Mon, 25 Feb 2013 11:31:47 -0500; It absolutely gobsmacks me how some guys in this hobby would rather whip-out the ol' VISA card & spend literally HUNDREDS on power amplifier tubes, when the lowly ol' 813--paired with some twins, of; /archives//html/Amps/2013-02/msg00230.html (10,649 bytes)
32. Re: [Amps] 813 efficiency (score: 1): Author: donroden@hiwaay.net; Date: Mon, 25 Feb 2013 11:46:47 -0600; Would you put them all in a row? Or a matrix of 3x4? Or 6x2? Or maybe in a circle? Can't wait to hear. :-) Six over six behind a huge glass panel. Turn out the lights !! Don W4DNR __________________; /archives//html/Amps/2013-02/msg00232.html (9,449 bytes)
33. Re: [Amps] 813 efficiency (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Mon, 25 Feb 2013 09:59:02 -0800; REPLY: I wouldn't say that maximizing plate dissipation is my goal, but you certainly want enough to not stress the tube at whatever power level you run. Bill, W6WRT _________________________________; /archives//html/Amps/2013-02/msg00233.html (9,332 bytes)
34. Re: [Amps] 813 efficiency (score: 1): Author: Robert Groh <rgroh@swbell.net>; Date: Mon, 25 Feb 2013 10:12:07 -0800 (PST); Love your comments, Colin. I visualize a 'ring' of 813's (like the cylinders of an old radial airplane engine) - bases all toward the center. All behind a big window (you just have to be able to see; /archives//html/Amps/2013-02/msg00234.html (10,542 bytes)
35. Re: [Amps] 813 efficiency (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 25 Feb 2013 13:12:45 -0500; I like the 4-250A tubes, they can provide the same output in CW and SSB service and plates glow much brighter. That along with some mercury rectifiers provide nice light shows when operating. 73 Bill; /archives//html/Amps/2013-02/msg00235.html (10,671 bytes)
36. Re: [Amps] 813 efficiency (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 25 Feb 2013 13:22:22 -0500; One tube in the 813 class never mentioned that is real cheap because practically very few amplifiers or transmitters used them is the 4E27A Pentode. It has 125 watts plate dissipation and fits into a; /archives//html/Amps/2013-02/msg00236.html (11,493 bytes)
37. Re: [Amps] 813 efficiency (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Mon, 25 Feb 2013 10:18:19 -0800; REPLY: That could be, I've never used one. It's pretty moot anyway. I suspect in a few years transistors will dominate ham amplifiers. Yes, cooling is a problem, but I do like the no tune, no warmup; /archives//html/Amps/2013-02/msg00237.html (9,430 bytes)
38. Re: [Amps] 813 efficiency (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 26 Feb 2013 14:22:48 -0500; The 803 is another tube that is way underated for Pd. REPLY: That could be, I've never used one. It's pretty moot anyway. I suspect in a few years transistors will dominate ham amplifiers. Yes, cool; /archives//html/Amps/2013-02/msg00240.html (10,737 bytes)
39. Re: [Amps] 813 efficiency (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 26 Feb 2013 14:09:10 -0500; Mount 4 up and 4 hanging down. Feed the cathodes thru a 2 port splitter and 200W+ drive. 10-4 and Yee Haw Carl KM1H Love your comments, Colin. I visualize a 'ring' of 813's (like the cylinders of an; /archives//html/Amps/2013-02/msg00241.html (11,916 bytes)
40. Re: [Amps] 813 efficiency (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 26 Feb 2013 14:29:32 -0500; The 4E27A seems to be an audiophool contender and getting pricey plus it is a HV, low current tube to be efficient. Eimac uses the first character to signal number of elements starting after WW2. Ano; /archives//html/Amps/2013-02/msg00242.html (13,306 bytes)

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