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1. [Amps] SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Mon, 19 Sep 2005 21:34:01 +0100; Hello All, The loading control on my SB200 is hard over anti-clockwise, i.e. max capacity on both 80&40 so I can't ever tune through a peak as such. Any ideas why this might be or what I can do to to; /archives//html/Amps/2005-09/msg00229.html (6,740 bytes)
2. Re: [Amps] SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Mon, 19 Sep 2005 22:19:28 +0100; Hello Stan, Yes I have tried it into a dummy load and the loading is the same. I run resonant antennas on both 80 & 40 so I don't think that's the problem either. -- Best regards, John mailto:kvp@big; /archives//html/Amps/2005-09/msg00230.html (8,774 bytes)
3. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Tue, 20 Sep 2005 06:32:02 +0100; Hello Steve, I had the same thought about 80 and the extra 'C' and changed it out for a new one, I also tried increasing it's value and checked the switch out but although everything was fine I still; /archives//html/Amps/2005-09/msg00234.html (7,800 bytes)
4. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Tue, 20 Sep 2005 09:42:05 +0100; Hello Steve, I was wondering about the tank coil although I've not noticed a problem with it visually, perhaps adding a turn or two?? The HT runs at 2100 off load and 1950 on load. As I've said in ot; /archives//html/Amps/2005-09/msg00236.html (8,425 bytes)
5. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Tue, 20 Sep 2005 10:30:55 +0100; Hello Steve, Firstly Steve thanks for your help. The next time the thing is on the bench I'll maybe add a turn or two on the tank coil and see what happens. The anode current reads, for 500w out, 340; /archives//html/Amps/2005-09/msg00238.html (9,683 bytes)
6. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Tue, 20 Sep 2005 12:55:10 +0100; Hello Steve, Well as I said I doubt the readings are accurate, given +/- 10% the efficiency could be in the 60-65% range and as it looks good on the scope it probably is. I'll note your comments thou; /archives//html/Amps/2005-09/msg00242.html (9,113 bytes)
7. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Wed, 21 Sep 2005 09:23:13 +0100; Hello Carl, Well the spec says the max volts on the anode should be 2400, so maybe Heathkit decided to save the valves a little. The HT supply has been re-built. My mistake next...... On the FT-1000M; /archives//html/Amps/2005-09/msg00253.html (10,458 bytes)
8. Re: [Amps] [BULK] - Re: SB200 loading problem (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Wed, 21 Sep 2005 09:24:46 +0100; Hello Phil, I'll add it to the list of things to do next time the amp is on the bench, thanks. -- Best regards, John mailto:kvp@bigfoot.com _______________________________________________ Amps mailin; /archives//html/Amps/2005-09/msg00254.html (9,338 bytes)
9. [Amps] HT........................... (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Fri, 14 Oct 2005 11:07:23 +0100; Hello All, Bit OT this but a bit of fun for those of us who mess about with HT, have a look: http://205.243.100.155/frames/longarc.htm#Disconnect The exploding substation is fun............ And remem; /archives//html/Amps/2005-10/msg00354.html (7,380 bytes)
10. [Amps] Eimac serial numbers? (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Thu, 17 Nov 2005 16:25:34 +0000; Hello All, Is there a site where I can track down some Eimac serial numbers on a couple of 3-500z. I did look at the Eimac site and did a Google on 'Eimac serial numbers' but nothing useful came up.; /archives//html/Amps/2005-11/msg00284.html (7,010 bytes)
11. [Amps] Harbach Electronics (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Tue, 22 Nov 2005 08:55:15 +0000; Hello, Harbach Electronics seem to have gone back to a pre May 2005 front page for their web site now! And I'd really like to order some bits, but still no shop. -- Best regards, John mailto:kvp@bigf; /archives//html/Amps/2005-11/msg00428.html (6,497 bytes)
12. Re: [Amps] Spam etc... (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Thu, 10 Aug 2006 13:36:34 +0100; Hello, The only thing I can find that SPAM has to so with this group is that it's a anagram of AMPS, perhaps we could get back to the main point of this list. And before anyone says it, yes I know I; /archives//html/Amps/2006-08/msg00383.html (6,762 bytes)
13. Re: [Amps] Inverter Microwave HV Supply (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Wed, 23 Aug 2006 07:30:27 +0100; Hello George, Good luck with quieting the wife! I've tried all sorts of ways and nothing works with mine......... ;-) -- Best regards, John G8KVP mailto:kvp@bigfoot.com ______________________________; /archives//html/Amps/2006-08/msg00625.html (7,491 bytes)
14. [Amps] Interesting Item........................... (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Sat, 13 Jan 2007 09:58:24 +0000; Hello All, Just thought some of you might like to see this. Just goes to show what you can do with that draw full of old 4CX250b! http://cgi.ebay.co.uk/Marconi-1kW-HF-Amplifier-TWENTY-4CX250B-Tubes-A; /archives//html/Amps/2007-01/msg00119.html (7,081 bytes)
15. Re: [Amps] how much C in PS is too much? (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Mon, 22 Mar 2010 17:09:20 +0000; Hello All, I feel real inadequate now, knowing I just have normal capacitors in my SB-220. I must have POWER CAPS!!! to do my 'power buffering'....... The other thing, if I put twice as many of these; /archives//html/Amps/2010-03/msg00469.html (7,979 bytes)
16. Re: [Amps] Time to learn to use delete key (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Sat, 22 May 2010 12:40:45 +0100; Hello Charles, The whole point about Yahoo groups, which most seem to miss, is that they are item specific, this one being called 'AMPS' giving the hard of thinking the clue that it's about, AMPS. If; /archives//html/Amps/2010-05/msg00288.html (9,828 bytes)
17. Re: [Amps] Fan for SB220 (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Sun, 19 Dec 2010 09:27:53 +0000; Hello Don, Your knowledge of the English is sadly lacking. The great shiny teapot shortage of the 1650's meant we had to come up with a solution: http://en.wikipedia.org/wiki/Tea_cosy We'll never be; /archives//html/Amps/2010-12/msg00239.html (10,136 bytes)
18. Re: [Amps] SPAM Re: Fan for SB220 (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Sun, 19 Dec 2010 09:20:51 +0000; Hello Bill, Yes but would it be a better antenna if it were painted black? ;-) the radio antenna. -- Best regards, John G8KVP mailto:kvp@bigfoot.com _______________________________________________ Am; /archives//html/Amps/2010-12/msg00244.html (8,655 bytes)
19. [Amps] MOX resistors (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Sat, 19 Nov 2011 11:55:56 +0000; Hello, Anyone know of a source of 75-100K 3w MOX resistors in the UK? All the usual places don't seem to stock anywhere near this value. I thought it was about time to re-cap the old SB-220. Obtainin; /archives//html/Amps/2011-11/msg00074.html (7,015 bytes)
20. Re: [Amps] MOX resistors (score: 1): Author: John Parkins <kvp@bigfoot.com>; Date: Sun, 20 Nov 2011 08:23:50 +0000; Hello All, Well the original post is a bit mute now. Very soon after I made the post I found the Mouser(UK) site and ordered not only the resistors but the caps as well. Quite a bit cheaper than the; /archives//html/Amps/2011-11/msg00088.html (9,051 bytes)

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