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1. [Amps] 6146 via 572b's (score: 1): Author: "johne tds.net" <johne@tds.net>; Date: Tue, 12 Oct 2010 13:15:22 -0500; I was in qso with a another ham about a tube type amp that could be used with our Yaesu FT-817 's. The FT-817 will do about 5 watt's on a good day. He recalled that he did know of a amp like this. So; /archives//html/Amps/2010-10/msg00192.html (7,038 bytes)
2. Re: [Amps] 6146 via 572b's (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Tue, 12 Oct 2010 14:52:14 -0400; There is an amp in the Radio Handbook, forget which edition, that used a grid driven 4CX1500 that was designed as a companion to a 5W transmitter. I will try and look it up for you tonight. Mike, W1N; /archives//html/Amps/2010-10/msg00193.html (7,174 bytes)
3. Re: [Amps] 6146 via 572b's (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 12 Oct 2010 15:01:43 -0400; My choice for a tube 5 w to 500+ watt amplifier would be a pair of 4CX250B's with a passive grid class AB1. Grounded grid would be out of the question unless you plan to have two stages of amplificat; /archives//html/Amps/2010-10/msg00194.html (8,283 bytes)
4. Re: [Amps] 6146 via 572b's (score: 1): Author: Robert Morris <robrk@nidhog.net>; Date: Tue, 12 Oct 2010 15:12:28 -0400; Go look for grid driven, class AB1 amp designs. Any number of tubes from 2E26, 6146, 4X250, 4-400, 4-1000, on and on will take your 5 watts and make 30 or 3000 watts. The added complexity is the need; /archives//html/Amps/2010-10/msg00195.html (8,230 bytes)
5. Re: [Amps] 6146 via 572b's (score: 1): Author: john.brewer@us.schneider-electric.com; Date: Tue, 12 Oct 2010 15:30:20 -0400; "I was in qso with a another ham about a tube type amp that could be used with our Yaesu FT-817 's. The FT-817 will do about 5 watt's on a good day. He recalled that he did know of a amp like this. S; /archives//html/Amps/2010-10/msg00196.html (7,862 bytes)
6. Re: [Amps] 6146 via 572b's (score: 1): Author: Alex Malyava <alex.k2bb@gmail.com>; Date: Tue, 12 Oct 2010 15:31:36 -0400; What about "cascode" schematics? I remember, back in dormitory times, making one for my homebrewed radio. It needed about 100mW to produce 80-100W output, depends on band. ___________________________; /archives//html/Amps/2010-10/msg00197.html (9,203 bytes)
7. Re: [Amps] 6146 via 572b's (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 12 Oct 2010 14:36:50 -0500; Passive grid 4CX250B requires around 25 watts drive. The 4CX250B requires around 50 volts bias on the grid so it would take around 25 watts at 50 ohms to reach that peak voltage. Passive grid with a; /archives//html/Amps/2010-10/msg00198.html (9,528 bytes)
8. Re: [Amps] 6146 via 572b's (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Wed, 13 Oct 2010 04:54:58 +0800; Just get rid of the 817. Problem solved. 73, Alek. VK6APK From sunny Binningup, Western Australia http://www.qrz.com/db/vk6apk http://www.qrz.com/db/vk6ap == Email scanned by PC Tools - No viruses or; /archives//html/Amps/2010-10/msg00199.html (8,985 bytes)
9. Re: [Amps] 6146 via 572b's (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 12 Oct 2010 13:58:03 -0700; ORIGINAL MESSAGE: REPLY: Another complexity is the need for neutralization on a non-passive grid driven amp. If you only have five watts, passive grid is pretty much out of the question unless you wa; /archives//html/Amps/2010-10/msg00200.html (8,914 bytes)
10. Re: [Amps] 6146 via 572b's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 12 Oct 2010 17:03:30 -0400; Another tetrode option is a pair of 8072's out of discarded Motorola UHF mobile transmitters. Get the tube, heat transfer block and sockets. Find a big aluminum heat sink such as from a Moto pair of; /archives//html/Amps/2010-10/msg00201.html (10,116 bytes)
11. Re: [Amps] 6146 via 572b's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 12 Oct 2010 17:16:24 -0400; Ceramic-metal tubes generally dont require neutralization unless the layout gets sloppy. OTOH traditional circuit grid driven glass tubes usually do require it. A small CB amp as an IPA would do nice; /archives//html/Amps/2010-10/msg00203.html (9,596 bytes)
12. Re: [Amps] 6146 via 572b's (score: 1): Author: Lee Buller <k0wa@swbell.net>; Date: Tue, 12 Oct 2010 14:23:05 -0700 (PDT); This has been done with an old HW100 or HW101. The guy fed the output of the K2 (or QRP rig) into the HW100 just before the amp (2 x 6146) just after the driver. He used the tuned output/input betwee; /archives//html/Amps/2010-10/msg00205.html (9,286 bytes)
13. Re: [Amps] 6146 via 572b's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 12 Oct 2010 18:32:59 -0400; Any CB amp for starters with improvements be it tube or SS. Most of the tube amps used sweep tubes or a few 2 way radio types. Carl KM1H _______________________________________________ Amps mailing l; /archives//html/Amps/2010-10/msg00208.html (8,964 bytes)
14. Re: [Amps] 6146 via 572b's (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Wed, 13 Oct 2010 02:22:36 +0200; The 4CX350A is happy with 2 Watts through a 1:4 unun, if a 200 ohm grid dummy load is used it does 350W. When the grid is loaded with 50 Ohm 7W are sufficient for 350W out. 73 Peter Passive grid 4CX2; /archives//html/Amps/2010-10/msg00210.html (10,499 bytes)
15. Re: [Amps] 6146 via 572b's (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 12 Oct 2010 20:16:49 -0700; ORIGINAL MESSAGE: REPLY: Best idea yet. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-10/msg00211.html (8,750 bytes)
16. Re: [Amps] 6146 via 572b's (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Wed, 13 Oct 2010 00:53:21 -0400; I chose the 4cx250b tubes because they are readily available at hamfest and are reasonable, even new. 73 Bill wa4lav The 4CX350A is happy with 2 Watts through a 1:4 unun, if a 200 ohm grid dummy load; /archives//html/Amps/2010-10/msg00212.html (11,300 bytes)
17. [Amps] 6146 via 572b's (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 13 Oct 2010 00:38:48 -0700; ORIGINAL MESSAGE: REPLY: Best idea yet. :-) 73, Bill W6WRT tough slog. I gave up on these 100w xcvr's yrs ago. My FT-1000-D does 300 w pep put, without breaking a sweat. I tried 10 watts QRP cw yrs a; /archives//html/Amps/2010-10/msg00217.html (8,292 bytes)
18. Re: [Amps] 6146 via 572b's (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Wed, 13 Oct 2010 12:35:23 +0000; QRPers get no sympathy on this reflector! But you are right Jim. It's not the QRP guy, it's the OTHER guy who did all the work. _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2010-10/msg00222.html (7,962 bytes)
19. Re: [Amps] 6146 via 572b's (score: 1): Author: Gary Patterson <gpatterson53@hotmail.com>; Date: Wed, 13 Oct 2010 09:20:08 -0400; how did this thread get it's title?? "6146 via 572b's" what does it have to do with the discussion? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2010-10/msg00223.html (9,075 bytes)
20. Re: [Amps] 6146 via 572b's (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Wed, 13 Oct 2010 06:44:08 -0700; "how did this thread get it's title?? "6146 via 572b's" what does it have to do with the discussion? Actually, the digression was normal and almost logical. The original question was regarding using; /archives//html/Amps/2010-10/msg00225.html (9,245 bytes)

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