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1. Re: [Amps] Burning question of the day- how long is it? (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 4 Aug 2005 22:27:08 +0100
From a joint US-British household: The density of water is about 8.3 pounds per US liquid gallon (or about 8-11/32, if you must) so it doesn't really come close "a pint is a pound". On the other hand
/archives//html/Amps/2005-08/msg00124.html (8,987 bytes)

2. Re: [Amps] Amps Digest, Vol 32, Issue 12: Metric system (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 5 Aug 2005 06:03:28 +0100
But George, it was you who showed us how to measure air flow the easy way... in units of seconds per garbage bag. -- 73 from Ian G/GM3SEK _______________________________________________ Amps mailing
/archives//html/Amps/2005-08/msg00142.html (9,769 bytes)

3. Re: [Amps] Conversion Nightmare (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 5 Aug 2005 11:19:08 +0100
[...] For a real nightmare thread, try the one on the older Andrew connectors for LDF-5 Heliax. The inner conductor of that cable is hollow, and the center pin was screwed in using a self-tapping thr
/archives//html/Amps/2005-08/msg00154.html (8,245 bytes)

4. Re: [Amps] Is three a replacement 220 volt power cord for the AL-80B? (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 9 Aug 2005 07:33:07 +0100
You're a radio amateur and it's your amp. Just do it. And don't sell the amp to anyone who wouldn't do the same... or more. Spread the mod virus. Help stamp out Black Box Disease. -- 73 from Ian G/GM
/archives//html/Amps/2005-08/msg00318.html (7,708 bytes)

5. Re: [Amps] WTB Tetrode Board (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 9 Aug 2005 14:39:47 +0100
Nothing like as much as I do, right now. This whole thing is taking much, much longer than I had ever imagined... The kits will be back in production again, just as soon as we're fully established at
/archives//html/Amps/2005-08/msg00330.html (9,098 bytes)

6. Re: [Amps] RF Parts OEM 3-500ZG's (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 10 Aug 2005 07:44:05 +0100
Since Rich is talking about 60Hz mains, the problem will be even worse when the blower is powered from 50Hz. I can't speak for the whole Henry range, but the "6N2" and similar VHF amps imported into
/archives//html/Amps/2005-08/msg00364.html (8,594 bytes)

7. Re: [Amps] Sort Start (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 12 Aug 2005 16:33:34 +0100
Agreed - most step-starts take way too long. When the step-start is about right, the first and second current steps will be about equal. You can tell this, near enough, by comparing the loudness of t
/archives//html/Amps/2005-08/msg00430.html (9,113 bytes)

8. Re: [Amps] Sort Start (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 12 Aug 2005 17:10:54 +0100
If you use short step-start, you can protect the resistor with a slow-blow fuse. Normally the step-start will be too quick to blow the fuse, but if the relay ever fails to close, the fuse will blow i
/archives//html/Amps/2005-08/msg00437.html (9,556 bytes)

9. Re: [Amps] Screen Supply (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 9 Sep 2005 15:55:26 +0100
Also download the QEX article for some basic information about screen supplies - including ideas to avoid. But according to the tube data, we're taking about a 1500V screen supply at 170mA! That's a
/archives//html/Amps/2005-09/msg00085.html (8,216 bytes)

10. Re: [Amps] MTBF Thread... (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 14 Sep 2005 13:41:22 +0100
It would be much better if they said: "Within the service life of this product, the average odds are 500,000 to 1 against it failing in any particular 1-hour period." But even though this may be tech
/archives//html/Amps/2005-09/msg00117.html (7,605 bytes)

11. [Amps] 5CX1500 (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 30 Sep 2005 19:49:57 +0100
If the person who e-mailed me a few days ago about the 5CX1500 pentode is reading this... Sorry, your message seems to have disappeared - please can you send it again? I'm pretty sure the answer is "
/archives//html/Amps/2005-09/msg00388.html (6,425 bytes)

12. Re: [Amps] Outgassing tubes. (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 2 Oct 2005 23:16:17 +0100
We should be careful to think of these as two totally different kinds of "gassy tube" problems. The releases of gas from structural materials are big enough to cause an arc when they happen, but are
/archives//html/Amps/2005-10/msg00064.html (8,579 bytes)

13. Re: [Amps] Outgassing tubes. (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 3 Oct 2005 00:02:19 +0100
The basic principle of a getter is to form a chemical bond with stray gas molecules. This is a two-way process because the chemical bonds are often quite weak, so trapped molecules can also be releas
/archives//html/Amps/2005-10/msg00070.html (10,088 bytes)

14. Re: [Amps] Outgassing tubes. (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 3 Oct 2005 07:30:39 +0100
While the barium metal getter is being deposited onto the glass (after the tube has been sealed), some of the remaining gas molecules are buried under the metal. In addition the process leaves a chem
/archives//html/Amps/2005-10/msg00082.html (10,100 bytes)

15. Re: [Amps] Outgassing tubes. (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 3 Oct 2005 08:21:09 +0100
The whole process of "conditioning" includes both removing any small internal spikes *and* giving the getter a chance to do its work. Surface spikes provide the high potential gradient, but a poor va
/archives//html/Amps/2005-10/msg00083.html (11,844 bytes)

16. Re: [Amps] Energy stored in capacitor bank ? (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 4 Oct 2005 15:05:10 +0100
The 'PSU Designer' program ends all the guesswork. Follow the links from my site, and also collect the expanded rectifiers file for HV supplies: http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#psu
/archives//html/Amps/2005-10/msg00111.html (9,207 bytes)

17. Re: [Amps] Outgassing tubes. (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 5 Oct 2005 08:45:54 +0100
Trying to wrap this up... Contrary to what I'd said previously, apparently microscopic surface spikes or "whiskers" *can* re-grow on some metals in a vacuum. This can affect NOS and long-stored vacuu
/archives//html/Amps/2005-10/msg00125.html (11,532 bytes)

18. Re: [Amps] One PS, many amps (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 6 Oct 2005 21:57:04 +0100
A separate resistor in each amp would reduce interaction and voltage drop, but a resistor is needed in the power supply as well, to handle the situation where one of the B+ leads shorts to ground. Ea
/archives//html/Amps/2005-10/msg00163.html (9,112 bytes)

19. Re: [Amps] One PS, many amps (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 6 Oct 2005 23:01:59 +0100
Workable for a single station, and for directly heated tubes; but in a multi-multi station, each amp needs full real-time metering. -- 73 from Ian G/GM3SEK http://www.ifwtech.co.uk/g3sek ____________
/archives//html/Amps/2005-10/msg00165.html (9,736 bytes)

20. Re: [Amps] One PS, many amps (score: 1)
Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 7 Oct 2005 07:27:10 +0100
As far as I know, high voltage itself is not harmful to the tube in any way. What is actually harmful is a demand for more electron current than the filament or cathode is capable of emitting, becaus
/archives//html/Amps/2005-10/msg00169.html (8,826 bytes)


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