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Total 306 documents matching your query.

261. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 05 Mar 2009 09:08:50 -0800
10-4 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-03/msg00143.html (7,759 bytes)

262. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 05 Mar 2009 10:36:47 -0800
Sorry guys (and to Bob in particular), I'll try to behave myself from now on. I've been sick with a cold and I woke up with a terrible headache this morning, so I was feeling a bit ornery. The amp wa
/archives//html/Amps/2009-03/msg00151.html (9,784 bytes)

263. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Sun, 17 May 2009 21:32:06 -0700
I am embarassed to admit, but I just got after it this evening, Kimo. I've had a bunch of other things going on, so I just kept putting it off - that is - until my backup amp died last night (looks l
/archives//html/Amps/2009-05/msg00103.html (8,190 bytes)

264. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 19 May 2009 06:31:41 -0700
Hi Jim, Per the schematic, it looks like the blower is run from the between one side of the 240V input and the center tap on the transformer primary. One of the units I have here (I have two in my wo
/archives//html/Amps/2009-05/msg00122.html (8,806 bytes)

265. Re: [Amps] George W6TC (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Fri, 20 Nov 2009 11:43:42 -0800
I saw this on one of the other reflectors to which I subscribe. A very impressive guy: http://www.legacy.com/obituaries/sfgate/obituary.aspx?page=lifestory&pid=136130578 RIP Mike W4EF............. __
/archives//html/Amps/2009-11/msg00212.html (8,324 bytes)

266. Re: [Amps] Who sells black rope? (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Sun, 22 Nov 2009 17:30:31 -0800
Mike/Carl, You can also buy direct from the manufacturer: http://www.synthetictextilesinc.com/supportham.html When I have compared prices in the best, the factory direct price was better than the dis
/archives//html/Amps/2009-11/msg00232.html (8,124 bytes)

267. Re: [Amps] What is Henry 2K Classic X Worth? (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 31 Dec 2009 11:29:02 -0800
"Ebay prices realized" indicates records of four 2K Classic sales ranging from a low of $550 to a high of $1455 with a mean of $886 http://www.aade.com/hampedia/prices2.htm Mike W4EF/6............. P
/archives//html/Amps/2009-12/msg00580.html (7,362 bytes)

268. [Amps] L-4PS Transformer Buzz (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 15 Feb 2010 09:41:56 -0800
I just installed the Harbach PM-400 in the L-4PS power supply for one of my Drake L-7 amps after I popped a rectifier diode in the old bridge: http://www.harbachelectronics.com/main/page_products_dra
/archives//html/Amps/2010-02/msg00408.html (7,265 bytes)

269. Re: [Amps] L-4PS Transformer Buzz (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 15 Feb 2010 10:49:33 -0800
Carl/Dick, et al. I triple checked the polarity of the caps before I put the cover on the PS and they are installed properly. Also, I didn't see any swelling or smell anything from the PWB after I fi
/archives//html/Amps/2010-02/msg00411.html (7,716 bytes)

270. Re: [Amps] 4cx800a (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 15 Feb 2010 18:13:55 -0800
Is there a reliable supplier of NOS GU74B/4CX800A's? I have an Alpha 91B and was thinking that I should pick-up some spare tubes for it before the NOS pool dries up completely. I see that UR4LL is ad
/archives//html/Amps/2010-02/msg00423.html (9,368 bytes)

271. Re: [Amps] 4cx800a (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 15 Feb 2010 21:00:01 -0800
Thanks to everyone for the feedback on Dr. Alex UR4LL. From all accounts he is a very good person to deal with. That brings me to my next question. Is the GU74B truly pin-for-pin compatible with the
/archives//html/Amps/2010-02/msg00427.html (8,633 bytes)

272. Re: [Amps] L-4/L-7 Power Supply (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 18 Feb 2010 09:58:27 -0800
Hi Ed, What you refer to as bleeder resistors are really part of a voltage divider that provides cutoff bias for the 3-500Zs. There are two 50 kohm x 50 watt resistors in series on the top side of th
/archives//html/Amps/2010-02/msg00522.html (8,782 bytes)

273. Re: [Amps] L4PS Xfmr buzz (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 18 Feb 2010 10:14:55 -0800
&& Not that I recall. && See below && You can't toss those two "bleeders", Jim. They are part of a voltage divider used to produce cutoff bias for the tube. In addition to supplying cutoff bias, they
/archives//html/Amps/2010-02/msg00523.html (10,633 bytes)

274. [Amps] Matching GU-74Bs (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 22 Mar 2010 16:06:45 -0700
I just got a note from Alex UR4LL that is out of GU-74Bs. When I went searching the internet for alternate suppliers, I found a tech note from Alpha indicating that use of anything except "matched pa
/archives//html/Amps/2010-03/msg00474.html (8,018 bytes)

275. Re: [Amps] L-4PS Transformer Buzz (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Fri, 26 Mar 2010 23:28:43 -0700
No, Ryan, I haven't had the time to fiddle with it. The buzz comes and goes on my supply. It was very loud the other day, but mostly it is not too bad. The buzz is almost always silent when I turn on
/archives//html/Amps/2010-03/msg00678.html (9,697 bytes)

276. Re: [Amps] me not an idiot (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 29 Mar 2010 06:58:59 -0700
Tell me about it, Carl. I am one of those....uh....uniformed people with an Alpha 91B. At this point, I'd much rather have a YC156 amp :-) 73, Mike W4EF............ __________________________________
/archives//html/Amps/2010-03/msg00761.html (8,806 bytes)

277. Re: [Amps] me not an idiot (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Mon, 29 Mar 2010 07:27:44 -0700
I have two here. One is mine, the other belongs to a club that I am affiliated with. The older one belonging to the club has a fried HV rectifier that needs fixing and mine has some other as yet undi
/archives//html/Amps/2010-03/msg00764.html (8,922 bytes)

278. Re: [Amps] DRAKE L-7 (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 06 Apr 2010 06:59:45 -0700
Bob, Are you using a stock L-7PS or L-4PS power supply with your L-7? The numbers you are getting don't seem to make sense. The L-7 runs the 3-500Zs in zero-bias mode similar to the SB-220. The resti
/archives//html/Amps/2010-04/msg00151.html (11,094 bytes)

279. Re: [Amps] DRAKE L-7 (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 06 Apr 2010 21:29:36 -0700
Bob, There are pictures of the L-4PS with the following Ebay ad: http://cgi.ebay.com/Drake-L-4B-L4B-HF-Linear-Amplifier-Matching-L-4PS-HAM_W0QQitemZ150430698367QQcmdZViewItemQQptZLH_DefaultDomain_0?h
/archives//html/Amps/2010-04/msg00175.html (16,260 bytes)

280. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 09 Nov 2010 10:06:55 -0800
That is a good observation, Jeff. It is quite easy to make a 500 watt amp splatter up and down the band, whereas a clean 10KW amp would not be noticed. Breaking the rules of a contest is cheating by
/archives//html/Amps/2010-11/msg00098.html (8,676 bytes)

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