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1. [Amps] Mail Order Operations (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 5 Sep 2003 00:49:08 +0100 (BST)
Just out of interest I spent some boring minutes going back over the Badhams messages. My counting could easily be wrong, and certainly some of the allegations were just that, but: 2 VE7s - One of wh
/archives//html/Amps/2003-09/msg00043.html (8,075 bytes)

2. [Amps] Tufnol Rod (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 17 Sep 2003 13:39:41 +0100 (BST)
I am sure that some grades at least of Tufnol are not hygroscopic. Itis quite commonly used for bushes in mine shaft cage suspension links where water absorption would be really bad news, especially
/archives//html/Amps/2003-09/msg00156.html (7,930 bytes)

3. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Tue, 18 Nov 2003 16:43:57 +0000 (GMT)
I too was very surprised to find HV single phase power distribution when I arrived here from England. I had always understood that long(ish) transmission lines needed to be 3 phase to keep the neutra
/archives//html/Amps/2003-11/msg00257.html (9,612 bytes)

4. Re: [Amps] MLA-2500 question (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Fri, 12 Dec 2003 18:40:34 +0000 (GMT)
Neither of my MLA2500s has a reflected power monitoring position - other versions may have. I think that the purpose of the trimmer is to try and make the flat across the frequency range. It fails mi
/archives//html/Amps/2003-12/msg00215.html (7,476 bytes)

5. re: [Amps] one people, separated by a common language (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Sun, 25 Apr 2004 13:45:15 +0100 (BST)
I hate to admit my ignorance, but: Who was Rube Goldberg? Heath Robinson was a guy who would make things that worked from unsuitable materials. Note that it is important that the things actually work
/archives//html/Amps/2004-04/msg00189.html (7,674 bytes)

6. [Amps] Tuned power transformer (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 19 May 2004 12:50:10 +0100 (BST)
As Angel lives in Switzerland, there is some vague possibility that he too may be 'foreign', and have 50Hz power to his house......... 73 Roger VE3ZI _________________________________________________
/archives//html/Amps/2004-05/msg00155.html (7,355 bytes)

7. Re: [Amps] SAFETY WITH HIGH VOLTAGE (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 23 Aug 2004 14:37:57 +0100 (BST)
I am also quite suspicious of a wire-wound resistor failing to a low value. FWIW, my work includes certification of equipment as Intrinsically Safe for use in underground gaseous mines. This equipmen
/archives//html/Amps/2004-08/msg00267.html (8,926 bytes)

8. Re: [Amps] 4-250A and interesting socket information. (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 25 Aug 2004 19:52:59 +0100 (BST)
... wartime, etc.? Seems like a tube that got that hot wouldn't last long under battle conditions.... I have the remains of an ex-military Marconi transmitter which used a pair of 4-125 tubes. It has
/archives//html/Amps/2004-08/msg00306.html (7,018 bytes)

9. [Amps] 3CX1500A7/8877 (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 27 Oct 2004 03:40:50 +0100 (BST)
Can anybody recommend a good source for one of these tubes? The ideal would be a guaranteed good pull. Thanks and 73 Roger VE3ZI ___________________________________________________________ALL-NEW Yah
/archives//html/Amps/2004-10/msg00431.html (6,516 bytes)

10. [Amps] Marconi AM Transmitter (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 20 Dec 2004 11:44:58 +0000 (GMT)
A friend of mine (VE3AC) has an old (1952) Marconi 500W AM transmitter, which is ex Canadian military and covers 1.5-15MHz. It uses a pair of 4-125s in both PA and modulator. It is very nice, but als
/archives//html/Amps/2004-12/msg00244.html (6,839 bytes)

11. [Amps] 3-1000 or 4-1000? (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Thu, 23 Dec 2004 18:31:35 +0000 (GMT)
Is it possible to tell the difference between a 3-1000 and a 4-1000 just by looking? We have one where the lettering is completely disappeared. If it is relevant it has a metal 'base' - which means I
/archives//html/Amps/2004-12/msg00290.html (7,338 bytes)

12. [Amps] 3-1000 or 4-1000 (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Thu, 23 Dec 2004 18:47:37 +0000 (GMT)
Thanks guys! I am very impressed. Within literally seconds of my message being posted I had authoritive answers from lots of people. It is a 4-1000A. 73 Roger ________________________________________
/archives//html/Amps/2004-12/msg00292.html (6,809 bytes)

13. [Amps] please help with weird problem - culprit found (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 31 Jan 2005 14:03:26 +0000 (GMT)
Don is blaming himself for this problem. My feeling is that Icom should not offer/have offered equipment with a defective design! All Don did was to connect an auxiliary receive antenna to the auxili
/archives//html/Amps/2005-01/msg00635.html (7,474 bytes)

14. Re: [Amps] please help with weird problem - culprit found (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Mon, 31 Jan 2005 21:15:45 +0000 (GMT)
I am certainly not in favour of any attempt to get Icom to pay for the repair, and I think it very likely that any such attempt would fail. After all the radio is probably 10 years old. However, I re
/archives//html/Amps/2005-01/msg00651.html (9,436 bytes)

15. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Tue, 29 Mar 2005 23:28:49 +0100 (BST)
I will probably be sorry, but I am going to stick my nose into this one: 1. It is certainly true that a Class B grounded grid amplifier will have a varying input impedance over the driving cycle. 2.
/archives//html/Amps/2005-03/msg00706.html (10,971 bytes)

16. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 30 Mar 2005 04:45:42 +0100 (BST)
Ooops 73 Roger VE3ZI Send instant messages to your online friends http://uk.messenger.yahoo.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont
/archives//html/Amps/2005-03/msg00710.html (8,089 bytes)

17. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 30 Mar 2005 15:17:23 +0100 (BST)
I think that Steve, G8GSQ, probably has the answer: I have now convinced myself that it is nothing to do with the matching network per se, or with flywheel effects. Many grounded grid amplifiers like
/archives//html/Amps/2005-03/msg00717.html (8,930 bytes)

18. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Wed, 30 Mar 2005 23:19:26 +0100 (BST)
I have to confess that I hadn't considered it either - you took that extra step! (I probably suggested it when I mistakenly wrote 'admittance' rather than 'conductance' but I was really thinking of t
/archives//html/Amps/2005-03/msg00732.html (12,147 bytes)

19. [Amps] DIN - Plessey connectors (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Tue, 28 Feb 2006 03:24:03 +0000 (GMT)
RE: [Amps] - DIN stands for....? 'Plessey' [LMF, LMG (coarse) and LMJ (fine)] connectors are still available from Weald Electronics who brought out the designs many years ago. They are widely used in
/archives//html/Amps/2006-02/msg00654.html (8,896 bytes)

20. [Amps] Threads - was idiocy - perhaps it still is (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Tue, 14 Mar 2006 05:11:35 +0000 (GMT)
For what it's worth, Whitworth threads did vary the pitch depending upon the bolt size. They were the world's first properly defined thread, and the standard British 'coarse' thread for over 100 year
/archives//html/Amps/2006-03/msg00352.html (8,110 bytes)

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