- 341. Re: [Amps] What tube? (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 29 Jan 2015 23:37:45 -0500
- Not necessarily. Particularly older glass bottles like the 813 and glass to metal like the PL172 which go gassy with little or no use. Good 813s are gettiong harder to find and I think PL172s are rar
- /archives//html/Amps/2015-01/msg00376.html (9,095 bytes)
- 342. Re: [Amps] Arctic Silver with and without silver (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 06 Feb 2015 00:36:59 -0500
- I usually purchase the larger tube of "Arctic Silver" from NewEgg, or one of the other computer supply houses. The silver is I believe, a polymer, but it's out in the shop. Rather than cut and paste,
- /archives//html/Amps/2015-02/msg00072.html (10,527 bytes)
- 343. Re: [Amps] Arctic Silver with and without silver (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 06 Feb 2015 01:13:12 -0500
- I've been using Arctic Silver since it came out. With over 20 builds under my belt, I've never had a problem with shorts. There is a learning curve on just how much to use with out "run over". You pu
- /archives//html/Amps/2015-02/msg00073.html (11,924 bytes)
- 344. Re: [Amps] Biasing a Class C modulated final (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Tue, 17 Feb 2015 21:13:31 -0500
- Not sure the 6L6 would be a good choice due to price, unless you have some, or a good source. The price on them is astronomical. My guitar amp uses 6 of them. I could purchase a nice, new amp for les
- /archives//html/Amps/2015-02/msg00103.html (9,447 bytes)
- 345. Re: [Amps] 8875 (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 26 Mar 2015 01:20:49 -0400
- Doesn't the 8875 use a transverse air flow? If so, how do you get proper cooling with the 3CX-800 ? The electrical part is simple, but mechanically? 73 Roger (K8RI) On 3/19/2015 8:46 PM, Carl wrote:
- /archives//html/Amps/2015-03/msg00066.html (9,932 bytes)
- 346. Re: [Amps] Arctic Silver with and without silver (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 10 Apr 2015 17:36:20 -0400
- Just a suggestion: As good as the compound is, it's still not as conductive as the copper heat spreader. The directions that should have come with the compound say to use as little as possible (parap
- /archives//html/Amps/2015-04/msg00060.html (11,933 bytes)
- 347. [Amps] Arctic Silver (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 10 Apr 2015 23:43:29 -0400
- Just a couple of thoughts: Arctic Silver is a compound that cures with a few hours of use. After a few heat cycles, the heat sink should be "stuck" to the transistor. If you break it loose checking,
- /archives//html/Amps/2015-04/msg00062.html (7,030 bytes)
- 348. Re: [Amps] Arctic Silver (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 12 Apr 2015 04:38:22 -0400
- It's not rocket science although there is a bit of a learning curve. Done properly, there is no excuse for air bubbles. Put a pile of heat sink compound in the center of the metallic cover on the CPU
- /archives//html/Amps/2015-04/msg00071.html (13,442 bytes)
- 349. Re: [Amps] Arctic Silver (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 12 Apr 2015 23:01:35 -0400
- I have no interest in NewEgg other than the money I spend there, nor do I know which products RS carries and in what quantities. So far it's a race between HRO and NewEgg. NewEgg wins on the number o
- /archives//html/Amps/2015-04/msg00089.html (16,435 bytes)
- 350. Re: [Amps] Test versus working voltage for oil filled capacitor (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Wed, 15 Apr 2015 09:14:16 -0400
- I was going to say the same. We used 1 to 4 of those big, heavy, oil filled caps in a resonant circuit for induction heating down in the KHz range running 100 to 250 KW. The coils were 1/2" copper tu
- /archives//html/Amps/2015-04/msg00108.html (11,439 bytes)
- 351. Re: [Amps] Oil v water cooling (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 18 Apr 2015 05:28:33 -0400
- It's been a long time, but as John said, these solutions are ion hungry and particularly DI water. We measured resistivity at ohms per cubic centimeter,. It's not just solder, they will reduce a bras
- /archives//html/Amps/2015-04/msg00124.html (14,033 bytes)
- 352. Re: [Amps] Considering an ALS-1306 (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 24 Apr 2015 22:00:21 -0400
- It's not who's right, it's who put in components such as the PS that are capable of running at tilt all day long. With tube amps it's normal for one that will run the legal limit all day long to be h
- /archives//html/Amps/2015-04/msg00162.html (12,805 bytes)
- 353. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 02 May 2015 21:39:04 -0400
- Although the Bird is recognized as the standard, even the gold standard, it is a very poor standard with the stock calibration being 5% of full scale. (I have 2) That is only if the slug hasn't been
- /archives//html/Amps/2015-05/msg00017.html (14,029 bytes)
- 354. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 04 May 2015 02:24:56 -0400
- If you have the equipment, the proper environment, know your heat losses, it is possible to measure power to a greater accuracy than you can read on an analog meter. BUT to do this takes time and eff
- /archives//html/Amps/2015-05/msg00044.html (15,256 bytes)
- 355. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 04 May 2015 02:41:47 -0400
- Al AN2ZY To suggest +/- 125 Watts anywhere on the scale, for a 2500 Watt range, simply does not make sense and it would make a total mockery of the using the instrument as a power measuring device. T
- /archives//html/Amps/2015-05/msg00045.html (13,982 bytes)
- 356. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 04 May 2015 04:18:34 -0400
- Measuring the temperature rise in a known quantity of water with a known heat loss is limited by the system's heat loss. Water is straight forward as an instrument as 1 calorie will raise the temper
- /archives//html/Amps/2015-05/msg00049.html (12,057 bytes)
- 357. Re: [Amps] Amps Digest, Vol 149, Issue 10 (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Tue, 05 May 2015 01:32:09 -0400
- Very simple really. You could refuse them entry (you had that right) and at that point they could initiate an enforcement action. Refusing the inspector entry (which you could do) is/was considered a
- /archives//html/Amps/2015-05/msg00079.html (10,989 bytes)
- 358. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Tue, 05 May 2015 06:23:08 -0400
- Having spent much of my life (Every Monday for nearly 23 years) calibrating instruments in the lab, maintenance, QA and production, it's normal for me to see readings I can believe in, whether that a
- /archives//html/Amps/2015-05/msg00080.html (12,917 bytes)
- 359. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 07 May 2015 14:23:55 -0400
- It works here, but took a while for the pages to load. It shows the relatively flat frequency response across the design rang with the roll off outside that range in db with the caveat that the eleme
- /archives//html/Amps/2015-05/msg00096.html (9,886 bytes)
- 360. Re: [Amps] Time for New Power Meter (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 07 May 2015 20:07:00 -0400
- I just clicked on the link in the post. It opens fine in Firefox, although a bit slow. The scans all cut the tops of the pages off. That site apparently does not have a lot of bandwidth, or my comput
- /archives//html/Amps/2015-05/msg00102.html (9,456 bytes)
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