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181. Re: [Amps] Filter Chokes (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 11 Mar 2012 12:32:03 -0500
Mike, you must have a single or double blooper? My that brings back memories. I was lucky enough to be in attendance at a MARA meeting in Memphis back around 1973 when Johnny gave a talk and showed a
/archives//html/Amps/2012-03/msg00123.html (9,614 bytes)

182. Re: [Amps] LK 550-ZC (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 17 Mar 2012 07:18:50 -0500
If you have 3 3-500s to cool and you operate any serious duty cycle at what the amp is capable of you probably need the high speed and accept the noise problem. hams obsess about fan noise far too mu
/archives//html/Amps/2012-03/msg00193.html (8,169 bytes)

183. Re: [Amps] LK 550-ZC (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 17 Mar 2012 12:14:27 -0500
What modes do you operate? How long are your transmissions? 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi
/archives//html/Amps/2012-03/msg00198.html (10,265 bytes)

184. Re: [Amps] LK 550-ZC (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 17 Mar 2012 13:43:30 -0500
I'd say you did an adequate test assuming you got three tubes to show orange anodes for at least 10 minutes. I had thought the reason for the high fan speed (and resulting noise) was that there are t
/archives//html/Amps/2012-03/msg00200.html (9,754 bytes)

185. [Amps] April QST article on RF power tube test stand (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 18 Mar 2012 09:13:50 -0500
Seems to me like a lot of work when, if you have an amp that uses a tube you want to check out, you can just put a variac in the line to the plate transformer primary and pretty much have what they b
/archives//html/Amps/2012-03/msg00201.html (7,421 bytes)

186. Re: [Amps] Chinese Caps Defective @ RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 24 Mar 2012 08:17:16 -0500
You have a lot of circulating current through blocking caps on 10 m. For a critical application, I'd stick with a known manufacturer like HEC where you can see a range of specifications and test data
/archives//html/Amps/2012-03/msg00254.html (7,872 bytes)

187. Re: [Amps] Chinese Caps Defective @ RF (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 24 Mar 2012 13:05:41 -0500
Indeed--a good example is these CRL doorknobs: http://www.ebay.com/itm/Door-Knob-Capacitor-75-pF-7500VDC-N750-kit-of-2-/22071330273 about 10 bucks each. I bought a pair and they are good caps. Unfort
/archives//html/Amps/2012-03/msg00257.html (8,246 bytes)

188. Re: [Amps] question for you experts... (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 28 Mar 2012 11:32:06 -0500
This sounds good but is doubtful: Just about all air variable load caps I have seen in use look like they are good for more than a few hundred volts, more like 1 or 2 KV. The stored energy in a 500 p
/archives//html/Amps/2012-03/msg00305.html (9,227 bytes)

189. Re: [Amps] How Do You Know When Filter Caps Begin to Fail? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 28 Mar 2012 17:15:03 -0500
I guess switching over to a few oil caps with appropriate bleeders standing by externally isn't a bad idea after all. Now I know why Henry used them. 73 Rob K5UJ _____________________________________
/archives//html/Amps/2012-03/msg00324.html (8,207 bytes)

190. Re: [Amps] How to know when filter caps begin to fail (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 28 Mar 2012 21:09:40 -0500
If I were you all, I'd either pay what it costs for decent electrolytics or look for used oil caps. This thing with reforming and having one go kablooey -- not worth it. Maybe you can find a few othe
/archives//html/Amps/2012-03/msg00334.html (8,493 bytes)

191. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 30 Mar 2012 08:50:34 -0500
Before everyone goes crazy with adding fans, a few things to keep in mind: An added fan if not done right can actually disrupt air flow and make things worse; not better. An added fan can push or pul
/archives//html/Amps/2012-03/msg00356.html (7,193 bytes)

192. Re: [Amps] Tubes for sale (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 3 Apr 2012 10:15:13 -0500
Good move. Better: 3 x 3-500zg Glass is Great. don't forget the chimneys. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma
/archives//html/Amps/2012-04/msg00030.html (7,315 bytes)

193. Re: [Amps] FWD: Ham Radio Amp - $8500 (Louisville Ky) 3CX10000-a7 (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 5 Apr 2012 13:04:30 -0500
Let's see....would you seriously hand over $8500 to someone who: Can't write a grammatically correct advertisement Says he has an RF power amp but wait....it is "plate modulated by a 4-400" supposedl
/archives//html/Amps/2012-04/msg00059.html (9,925 bytes)

194. Re: [Amps] Plate blocking cap voltage (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 6 Apr 2012 17:07:01 -0500
if B+ 3 KV I go for 7.5 KV Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-04/msg00078.html (7,293 bytes)

195. Re: [Amps] Who still sells HV Capacitors (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 11 Apr 2012 04:59:36 -0500
I have never bought a brand new oil cap. If you buy a 20 uF 5 KV oil cap new, how much can you expect to spend? 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2012-04/msg00097.html (7,907 bytes)

196. Re: [Amps] Who still sells HV Capacitors (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 11 Apr 2012 12:12:23 -0500
In that case I'll stick with used. Not much to go wrong with an oil cap. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2012-04/msg00103.html (7,231 bytes)

197. Re: [Amps] Who still sells HV Capacitors (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 12 Apr 2012 08:51:35 -0500
If I could get a Russian oil cap cash and carry at a hamfest I'd give one a try. I see them on eBay and they _look_ okay, but I am hesitant to go through all the import and shipping and waiting to fi
/archives//html/Amps/2012-04/msg00108.html (8,377 bytes)

198. Re: [Amps] Filter Capacitors (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 12 Apr 2012 22:21:21 -0500
Like Ron said, choke input filter = good idea. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-04/msg00118.html (7,812 bytes)

199. Re: [Amps] Who still sells HV Capacitors ? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 13 Apr 2012 13:38:23 -0500
I picked up a CP cap at Dayton a few years ago for $20 or $30, 7.5 KV 8.7 uF oil cap. It had a case crack but JB Weld fixed that. Seems good to go. Probably make a nice filter cap for a choke input.
/archives//html/Amps/2012-04/msg00131.html (8,388 bytes)

200. Re: [Amps] Who still sells HV Capacitors ? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 13 Apr 2012 21:48:10 -0500
That sounds like the ultimate filter cap--may as well put it into something--it's not getting any younger hi Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting
/archives//html/Amps/2012-04/msg00139.html (8,310 bytes)

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