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21. Re: [Amps] Can some explain this curious eBay auction (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Fri, 24 Aug 2012 18:10:13 -0700; Well, it's up to $10,801 now. If you want them you better hurry, only 16 minutes left :-) 73 Tom W7WHY In case anyone was wondering, the pair of Western Electric 300B triode tubes are up to $10,601 w; /archives//html/Amps/2012-08/msg00392.html (8,782 bytes)
22. Re: [Amps] Beware of seller orzel-enterprises on eBay (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Tue, 11 Sep 2012 10:06:50 -0700; Yeah, and that sucks. You can get screwed by a buyer and have no chance to leave feedback about it. A seller can't leave negative feedback for a buyer no matter what! 73 Tom W7WHY Please be sure to l; /archives//html/Amps/2012-09/msg00226.html (9,634 bytes)
23. Re: [Amps] Most power ever run on amateur radio :-) (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Wed, 19 Dec 2012 20:09:26 -0800; I was doing a Multi with a station who had a 4-1000 amp. There was a station on 40 that we were trying to get and he kept turning the steering wheel on the power supply up and calling him. We finally; /archives//html/Amps/2012-12/msg00126.html (9,454 bytes)
24. [Amps] SB-200 (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Sun, 17 Feb 2013 17:15:29 -0800; Lately my SB-200 has been acting strange. On 40 and 80 meters, the 'Load' cap has to be all the way in, and then it is only putting out about 300 watts. On 20, seems like the'Load' cap is in more tha; /archives//html/Amps/2013-02/msg00135.html (7,184 bytes)
25. [Amps] 572B tubes (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Tue, 30 Apr 2013 12:56:48 -0700; HI All I need a set of 572B tubes for my SB-200 but seems like RF Parts doesn't have any. Is there another source for good 572B tubes? Thanks and 73 Tom W7WHY ________________________________________; /archives//html/Amps/2013-04/msg00250.html (6,663 bytes)
26. Re: [Amps] 572B tubes (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Wed, 1 May 2013 17:20:36 -0700; Hi Jim Yep, saw those. But, really looking for a reputable seller. One guy had some on eBay for $49 for a pair. But, he said they were for audio and not RF. Thanks and 73 To, W7WHY Have you check eBa; /archives//html/Amps/2013-05/msg00002.html (7,519 bytes)
27. Re: [Amps] 572's (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Thu, 2 May 2013 20:27:23 -0700; You may be right, but I'd rather buy from someone I know. I've bought from RF Parts for a long time and never had any problems. Only tube that ever went bad was my fault and they still replaced it fo; /archives//html/Amps/2013-05/msg00031.html (8,274 bytes)
28. Re: [Amps] 572's (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Fri, 3 May 2013 08:27:44 -0700; You're right! Damn the cost - full speed ahead. Buy an Alpha 9500 or a Henry 8K :-) 572B amps, whether in pairs or 4 at a time are table top toy amps...best relegated to 6m service. Use a real amp wi; /archives//html/Amps/2013-05/msg00041.html (8,461 bytes)
29. Re: [Amps] Commander HF-1250 problem (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Mon, 18 Nov 2013 21:26:50 -0800; HI Doug. Know this sounds silly, but are you sure the switch in the amp is good? 73 Tom W7WHY Hi, My HF-1250 just went out. It was working fine and then the lights and fan started flickering for abou; /archives//html/Amps/2013-11/msg00368.html (7,635 bytes)
30. [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Sat, 18 Jan 2014 14:44:30 -0800; HI All I have an AL-811H that I've had for about a month. It has been working OK until last night. I was making a contact and all of a sudden, it started chattering and blew a fuse. This morning I to; /archives//html/Amps/2014-01/msg00146.html (7,591 bytes)
31. Re: [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Sat, 18 Jan 2014 15:24:34 -0800; HI Dick I disconnected one side and it came on OK and didn't blow the fuse. Still looking. 73 Tom W7WHY Disconnect the Transformer HV AC leads and try again. You may have lost the Xfmr. 73, Dick, W1K; /archives//html/Amps/2014-01/msg00150.html (8,453 bytes)
32. Re: [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Sat, 18 Jan 2014 15:31:28 -0800; No grid resistors. Grids are connected directly to ground. 73 Tom W7WHY HI Dick I disconnected one side and it came on OK and didn't blow the fuse. Still looking. 73 Tom W7WHY Disconnect the Transfor; /archives//html/Amps/2014-01/msg00151.html (8,595 bytes)
33. Re: [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Sun, 19 Jan 2014 19:46:37 -0800; Well - found the problem. Got 2 shorted filter caps. Is there a place to purchase these besides Ameritron, or would it be best to go with theirs. These are CD270mf x 450 volts with the screw connecto; /archives//html/Amps/2014-01/msg00172.html (7,587 bytes)
34. Re: [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Mon, 20 Jan 2014 08:53:27 -0800; The problem is - the Ameritron ones are rated at 450 volts. That seems like they are operating at pretty much their max. This one has about 1800-1900 plate voltage. Four of the Ameritrons are 1800 vo; /archives//html/Amps/2014-01/msg00180.html (8,168 bytes)
35. Re: [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Mon, 20 Jan 2014 08:57:58 -0800; Hi Bill I took the caps out. Two of them looked like they should - put the VOM across them and the needle deflected, then slowly came back on the VOM. The other two went to zero ohms and stayed there; /archives//html/Amps/2014-01/msg00181.html (9,490 bytes)
36. Re: [Amps] 811H pops fuses (score: 1): Author: "Tom Osborne" <w7why@frontier.com>; Date: Mon, 20 Jan 2014 11:07:10 -0800; Hi Gerald I checked that. I disconnected the secondary of the power transformer from the diode string and checked them. The all seem OK as they have a reading on the VOM one way and infinity the othe; /archives//html/Amps/2014-01/msg00186.html (8,490 bytes)
37. Re: [Amps] AL-811H popping fuses (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Fri, 31 Jan 2014 09:40:16 -0800; Well - got it fixed. It was the filter caps. Also ran into another problem (that I caused) when working on it. I was going to take the sub chassis with the tube sockets out to check the bottom. After; /archives//html/Amps/2014-01/msg00344.html (7,689 bytes)
38. [Amps] AL-811H plate voltage (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Sun, 09 Feb 2014 09:18:40 -0800; Hi All Is there a way to decrease the plate voltage in an AL-811H without using a variac? My line voltage is around 120v or so and the plate voltage in my amp is right at 1800 - right at the red mark; /archives//html/Amps/2014-02/msg00060.html (6,622 bytes)
39. [Amps] AL-811H resistors (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Fri, 14 Feb 2014 12:09:42 -0800; Hi All I replaced the 4 caps in my amp, and found that one of the bleeders was bad. Replaced it this morning. After letting it run a while, I touched the 4 resistors and they seem to be pretty hot. I; /archives//html/Amps/2014-02/msg00119.html (6,734 bytes)
40. Re: [Amps] AL-811H resistors (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Fri, 14 Feb 2014 17:25:00 -0800; Dan HI Dan Oh yes - I knew that. I must have written it wrong. I'm going to replace all 4. It does seem to be working fine now. Been running it full bore in the ARRL CW contest right now. Would like; /archives//html/Amps/2014-02/msg00121.html (7,240 bytes)

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