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1. Re: [Amps] Diode Identity (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Wed, 26 Oct 2005 10:07:15 -0400
Sounds like a rectifier in a ceramic package. I bought a bunch of these at a flea market one time marked JAN and 4007 (for 1N4007 I assume). Ex JAN military grade surplus. The only reference I can fi
/archives//html/Amps/2005-10/msg00594.html (8,386 bytes)

2. Re: [Amps] Question about safety ground connection (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Sun, 13 Nov 2005 18:36:01 -0500
You are not quite right on a couple of points. A standard 3 prong 220V plug has two hots and GROUND. There is no neutral. This creates a safety issue when wiring in 110V components using 1/2 of the 2
/archives//html/Amps/2005-11/msg00168.html (11,425 bytes)

3. [Amps] 220V wiring: Was Question about safety ground connection (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 15 Nov 2005 18:02:35 -0500
Everyone. When talking about a 220V outlet FORGET about what it may or may not do at the breaker box. A 3 prong 220V outlet is 2 hot and GROUND. A 4 prong 220V outlet (also called 110V/220V) has a ne
/archives//html/Amps/2005-11/msg00195.html (9,739 bytes)

4. Re: [Amps] AM-6155 amp,was 220V wiring: Was Question about safety ground connection (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 15 Nov 2005 20:56:52 -0500
NEMA ML3 is a 125/250 3 wire midget twist lock which is two wire with neutral at center. P stands for plug and R for receptacle. The standard NEMA 6-20 250V 3 wire receptacle is 2 poles with ground.
/archives//html/Amps/2005-11/msg00209.html (12,525 bytes)

5. Re: [Amps] Question about safety ground connection (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 15 Nov 2005 21:02:02 -0500
And many electricians will mark those "hot" white wires with a couple of black stripes with a magic marker. Mike, W1NR I always want to know a neutral isn't hot unless it's going to a switch leg whic
/archives//html/Amps/2005-11/msg00210.html (9,768 bytes)

6. Re: [Amps] 220V wiring: Was Question about safety ground connection (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 17 Nov 2005 07:11:02 -0500
And if you are so concerned about ground-neutral faults then use ground fault breakers. However, ham radio is not too friendly to GFI's. Any RF that floats on the ground will trip the breakers. I hav
/archives//html/Amps/2005-11/msg00265.html (12,436 bytes)

7. Re: [Amps] B&W FC-30 RFC (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 1 Dec 2005 20:17:39 -0500
I am recalling this from memory, but I am pretty sure it was 3-30 MHz at 30 amps. Mike, W1NR Hello All, Does anybody have any specifications on an old B&W FC-30 filament choke? I have seen a FC-30A f
/archives//html/Amps/2005-12/msg00005.html (7,435 bytes)

8. Re: [Amps] Pi vs Pi-L (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Wed, 1 Feb 2006 12:37:13 -0500
You will not find any commercial amplifiers or construction articles in the last 20 years that use Pi only. Pi-L is the simplest way to go for new amps. Ten-Tec uses an L-Pi-L circuit and solid state
/archives//html/Amps/2006-02/msg00008.html (9,872 bytes)

9. Re: [Amps] Need some 220K 2 watt carbon resistors (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Mon, 27 Mar 2006 07:45:35 -0500
Ohmite OX and OY series ceramic composition resistors can be used as replacements for carbons. They are non inductive unlike film and wirewound resistors. Available at Mouser, Digi-key, etc. See http
/archives//html/Amps/2006-03/msg00686.html (8,907 bytes)

10. Re: [Amps] Need some 220K 2 watt carbon resistors (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 28 Mar 2006 15:19:38 -0500
Ian, Ohmite does not say anywhere in their catalog or spec sheets about inductance. I asked their engineering department and was told that they are non-inductive. Mike, W1NR _________________________
/archives//html/Amps/2006-03/msg00710.html (13,188 bytes)

11. Re: [Amps] (no subject) (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Mon, 24 Apr 2006 09:38:51 -0400
I agree. I had my 2k transformer rewound for a lot less than a new Dahl. Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m
/archives//html/Amps/2006-04/msg00358.html (7,669 bytes)

12. Re: [Amps] hosstraders hopkinton, NH saturday (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 5 May 2006 17:34:45 -0400
I'll be looking for an amp too! Mike, W1NR any one going to the hosstraders flea tomorrow? I'll be there selling... Chuck Partain ka1mwp _______________________________________________ Amps mailing l
/archives//html/Amps/2006-05/msg00022.html (7,183 bytes)

13. Re: [Amps] multi-tube amplifiers (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 26 May 2006 14:16:17 -0400
I am considering building a dual 4CX1500B amplifier for a nice clean 1500W of AB2 output. Since one tube is only rated for 1100W output in AB2, the need for two to reach full "leagal" limit. Since I
/archives//html/Amps/2006-05/msg00390.html (8,245 bytes)

14. Re: [Amps] 4-1000 amp (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Sun, 28 May 2006 21:42:54 -0400
Cost is one factor. A single 3-1000Z costs much more than a pair of 3-500Zs. 4-1000A tubes were once plentiful as broadcast pulls and were very popular in homebrew amps because you could get good ser
/archives//html/Amps/2006-05/msg00463.html (8,328 bytes)

15. Re: [Amps] 3cx1500d7 amp 2006 handbook (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 6 Jun 2006 12:11:54 -0400
I have considered using this tube to retrofit into a Henry 2K. My biggest problem is that the tube is only available direct from Eimac and they don't "stock" them They seem to wait until they have en
/archives//html/Amps/2006-06/msg00168.html (7,907 bytes)

16. Re: [Amps] teeny copper strap (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Wed, 7 Jun 2006 09:51:31 -0400
I have been using copper flashing from Home Depot. They will cut just what you need, like a 12"x12" piece. Then bring it home and make strips with tin snips. Mike, W1NR ______________________________
/archives//html/Amps/2006-06/msg00198.html (7,999 bytes)

17. Re: [Amps] RCA 8122 Tubes (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 8 Jun 2006 09:18:38 -0400
They should be fine, but I'd run the filaments only for at least 48 hours to allow the getters time to do some gas removal. Mike, W1NR _______________________________________________ Amps mailing lis
/archives//html/Amps/2006-06/msg00220.html (7,822 bytes)

18. Re: [Amps] fiberglas tape (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 13 Jun 2006 05:28:18 -0400
Scotch # 27 Fiberglass electrical tape. It is a special high temp high dielectric strength tape. After wrapping a toroid core with it I also give it a couple of coats of GC Electronics Polystyrene "Q
/archives//html/Amps/2006-06/msg00272.html (8,468 bytes)

19. Re: [Amps] glass tape scotch 27 (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Wed, 14 Jun 2006 12:32:03 -0400
It's not just the temperature, but the physical endurance and the electrical properties as well. Remember that this stuff will be exposed to high RF and magnetic fields. I once had the base of an RF
/archives//html/Amps/2006-06/msg00288.html (11,157 bytes)

20. Re: [Amps] FW: glass tape ?scotch 27 (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 15 Jun 2006 11:52:38 -0400
Not a spray, but I use GC Electronics Q-Dope. Of course, I wrap the core with glass tape first. I guess you could use Q-dope directly. Mike, W1NR Is there a HV spray ( like flyback coating ) that can
/archives//html/Amps/2006-06/msg00293.html (8,462 bytes)

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