Search String: Display: Description: Sort:

Results:

References: [ +from:alexeban@gmail.com: 257 ]

Total 257 documents matching your query.

201. Re: [Amps] Microwave Oven Power Transformer (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 26 Nov 2012 12:39:25 +0200
Guys: I'm still using an Amana uwave oven transformer (something in the 1000 Watts class) which I had for the last 20 years. It feeds a 4-1000 amplifier and works as well as when it was new! Sooooo,
/archives//html/Amps/2012-11/msg00171.html (10,153 bytes)

202. Re: [Amps] Expert 2K (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 4 Mar 2013 18:50:37 +0200
Where did you see anything like a spec????? Alex 4Z5KS Interesting in that they list even less specs than the Icom. Carl KM1H How much do these amps cost ? if problems arose, or warranty work had to
/archives//html/Amps/2013-03/msg00052.html (7,962 bytes)

203. Re: [Amps] Source of Mica Caps? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 3 Jun 2013 14:56:26 +0300
Try also these: http://www.cde.com/ http://www.capaxtechnologies.com/pdffiles/2225NPO.pdf unfortunately 2 more that I had went down. Alex 4Z5KS Does anybody know where I can buy a replacement for one
/archives//html/Amps/2013-06/msg00014.html (8,222 bytes)

204. Re: [Amps] Source of Mica Caps? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 3 Jun 2013 15:00:02 +0300
Try this: http://www.tabmica.co.uk/page7.html Does anybody know where I can buy a replacement for one of the mica grid bypass capacitors used in the Heathkit SB220? I believe they are 115 pf. Can't f
/archives//html/Amps/2013-06/msg00015.html (8,346 bytes)

205. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 6 Jun 2013 07:30:02 +0300
Tokyo High power have marketed one of these and there is a paper in QST that you might use as starters. I would recommend going with the ARF 1501 with a 1200 VDC drain rating just to be on the safe s
/archives//html/Amps/2013-06/msg00071.html (11,984 bytes)

206. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 6 Jun 2013 07:47:42 +0300
The high value of capacitance is required for dynamic regulation: you have jumps in the current from about 2A quiescent to about 10 or 12 Amp at full output. Remember, the output impedance is quite c
/archives//html/Amps/2013-06/msg00074.html (12,604 bytes)

207. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 6 Jun 2013 08:05:01 +0300
No, the problem really lies with the devices. I used a pair of these devices from AR and they took a lot of abuse without complaints! I heard from local sources that microsemi have problems with void
/archives//html/Amps/2013-06/msg00077.html (12,987 bytes)

208. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 6 Jun 2013 09:17:48 +0300
No, it was true! Due to the low impedances involved they were quite broadband. The biggest headache was to keep the tubes at equal-more or less- current drains so as not to blow one. At least, when y
/archives//html/Amps/2013-06/msg00079.html (10,176 bytes)

209. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 6 Jun 2013 09:21:09 +0300
They usually used from 4 to 8 tubes, due to placement problems. The 16 stems from the sweet 16 composite speaker; 1t was built from 16 cheap replacement speakers and relied on mutual compensation. Su
/archives//html/Amps/2013-06/msg00080.html (10,035 bytes)

210. Re: [Amps] Advice needed for SS amp (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 7 Jun 2013 08:56:14 +0300
With Peltier elements you have the same problem! While the side in touch with the transistor is absorbing heat, the far side heats up at the same rate so that you have to get rid of THAT heat, just l
/archives//html/Amps/2013-06/msg00146.html (10,918 bytes)

211. Re: [Amps] The Pin One Problem (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 7 Jun 2013 12:11:33 +0300
What about plain old ground loops, numerology set aside? Alex 4Z5KS Would that would be "Brown's Law"? I'm sorry, Jim, but it just ain't so. We all understand your personal respect for Neil Muncie, b
/archives//html/Amps/2013-06/msg00149.html (10,141 bytes)

212. [Amps] pin 1 ....... (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 7 Jun 2013 12:15:43 +0300
What about plain old ground loops, numerology set aside? Alex 4Z5KS _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/Amps/2013-06/msg00150.html (6,196 bytes)

213. Re: [Amps] Glass Tape (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 29 Jul 2013 08:08:13 +0300
Guys, the adhesive is NOT an issue: after being over wound with the wire it is irrelevant! There are 2 kinds of tape : fiberglass, which is an organic material and glass fiber which is not. Corvettes
/archives//html/Amps/2013-07/msg00090.html (12,021 bytes)

214. Re: [Amps] Glass Tape (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 31 Jul 2013 08:15:48 +0300
BTW, a great majority of enclosures -for outdoor use- that the cable TV companies use for line amplifiers and drop boxes are made of the same material. They have o life expectancy of at least 20 yea
/archives//html/Amps/2013-07/msg00109.html (8,954 bytes)

215. Re: [Amps] Rectifier equilization? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sat, 14 Sep 2013 12:56:14 +0300
Neither are needed any longer. The capacitors were required because the recovery time of old rectifiers was soo bad, that you could hear the noise generated in any close by amplifier. This is no long
/archives//html/Amps/2013-09/msg00159.html (10,397 bytes)

216. Re: [Amps] Combiners for SS amps + cooling issues. (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 15 Sep 2013 13:54:48 +0300
....it's quite a primary concern!! The problem with filter capacitors is their relatively large series inductance-ESL. Since most diode killers are fast rising transients, of relatively short duratio
/archives//html/Amps/2013-09/msg00180.html (9,499 bytes)

217. Re: [Amps] Direct rectification of AC mains to derive the amp VDD supply (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 16 Sep 2013 13:13:23 +0300
Why? The TV industry and the American radio industry has been doing it for tens of years! You don't have any qualms about using a transformer coupled power supply, but you shrink when considering a t
/archives//html/Amps/2013-09/msg00190.html (11,916 bytes)

218. Re: [Amps] Fwd: Rectifier equilization? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 16 Sep 2013 13:24:17 +0300
Semtech were known to be crazy about their diodes. I remember Magnavox was using them in the GRC-106 SSB radio at 2400 volts. The nly one ever gone was one cracked by over tightening the mounting scr
/archives//html/Amps/2013-09/msg00191.html (11,467 bytes)

219. Re: [Amps] Rectifier equilization? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 16 Sep 2013 13:49:17 +0300
Oh yes! It was used in the series heated filament string in tube TV ages ago. At the time it was called a thermistor!! What you were thinking about was the VDR, a non linear resistor that was used in
/archives//html/Amps/2013-09/msg00192.html (14,642 bytes)

220. Re: [Amps] Direct rectification of AC mains to derive the amp VDD supply (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 20 Sep 2013 08:10:16 +0300
NO,NO,NO!! The rectified line- rectified and filtered , that is- does not go to the chassis!!!! Ever wonder why AC/DC radios were built in a Bakelite case? It was because the radio chassis inside was
/archives//html/Amps/2013-09/msg00256.html (15,661 bytes)

Current List: 201 - 220
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]
This search system is powered by Namazu