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1. [Amps] DC On tube filaments (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Thu, 10 Oct 2002 07:57:21 -0400; In the 20's and 30's most radios ran off of batteries (DC). Many of the filaments were rated for 1.5v so they could run on a single battery cell. Mike, W1NR; /archives//html/Amps/2002-10/msg00094.html (7,588 bytes)
2. [Amps] Eimac 3-1000z Tubes (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Thu, 10 Oct 2002 08:01:11 -0400; My Dad had a homebrew 4-1000 that started life with a broadcast pull. It went 25 years before it quit. I don't know how many hours it had prior to it going into service in my Dad's amp, but those tub; /archives//html/Amps/2002-10/msg00095.html (6,855 bytes)
3. [Amps] HV Circuit Board Material? (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Fri, 14 Jun 2002 16:43:29 -0400; I have had good success with Vector FR-4 Epoxy perfboards. I have used both the press in pins and just having the leads go through the board and soldering them together on the other side. 73 de Mike,; /archives//html/Amps/2002-06/msg00098.html (7,819 bytes)
4. [Amps] 3-400Z Tube Replacement ideas (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Thu, 16 May 2002 12:15:18 -0400; How about a 3CX1200? There are many articles about converting 3-500 based amps to this tube. It should be the same for the 3-400 as well. Mike, W1NR; /archives//html/Amps/2002-05/msg00244.html (7,698 bytes)
5. [Amps] Bi-directional 2.4 GHz amps (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Sat, 6 Apr 2002 08:13:26 -0500; Can someone point me to full or reference designs for a 2.4GHz bi-directional amplifier in the 5-10W class? It is for spread spectrum. Thanks, Mike, W1NR; /archives//html/Amps/2002-04/msg00213.html (6,371 bytes)
6. [Amps] 4-400G (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Mon, 8 Apr 2002 13:39:57 -0400; I had an SB-220 with Amperex graphite anode 3-500's in it. They were virtually indestructible, although they didn't put out quite as much as the old Eimac tantalum plate versions. Mike, W1NR; /archives//html/Amps/2002-04/msg00243.html (7,772 bytes)
7. [Amps] RF Ground for 2nd Floor (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Tue, 16 Apr 2002 15:22:47 -0400; It is also REQUIRED in the NEC (National Electric Code) that ALL grounds be bonded. I bring everything in a star to the main ground point, which in my case is the water main. I have ground rods at e; /archives//html/Amps/2002-04/msg00388.html (12,872 bytes)
8. [Amps] Air gap for 12000 volts? (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Mon, 22 Apr 2002 11:06:01 -0400; That information used to be in the Handbook. It was under dielectric properties of capacitors in one of the introductory chapters. I don't recall if the table went to 12000V, but I think I remember a; /archives//html/Amps/2002-04/msg00515.html (8,197 bytes)
9. [Amps] config cathode-drive Amp with a Tetrode? (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Fri, 15 Mar 2002 20:50:30 -0500; Hi Joe, It depends somewhat on what tube you use. The 4-1000 has grids with sufficient rating so that you can strap them to ground and run it like a grounded grid triode. Most tetrodes don't. The 4CX; /archives//html/Amps/2002-03/msg00368.html (8,869 bytes)
10. [AMPS] Building new 4-1000A amp (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Thu, 3 Jan 2002 07:27:12 -0500; Why does everyone insist that the 4-1000 needs in excess of 5kV to run legal limit? I have built several that easily put out 1500W with only 4-4.5 kV and 100W from a solid state rig. Am I just using; /archives//html/Amps/2002-01/msg00032.html (9,279 bytes)
11. [AMPS] 4-1000A Project (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Tue, 3 Apr 2001 15:28:54 -0500; My 4-1000A amp will get 1800W key down output with 4400V full load on the plate and 100W drive. At 5000V things start to arc all over the place. It is very happy with 70W drive for 1500W output and 4; /archives//html/Amps/2001-04/msg00027.html (10,530 bytes)
12. [AMPS] Roller Inductors vs. Bandswitches ... which is best? (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Tue, 6 Feb 2001 19:35:01 -0500; Theo, A roller inductor will give you "general coverage" as well as being able to fine tune each band better than with fixed taps. However, there is an added circuit to adjust every time you change b; /archives//html/Amps/2001-02/msg00164.html (8,581 bytes)
13. [AMPS] hot switching on break (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Tue, 20 Feb 2001 11:08:24 -0500; All rigs I have ever seen never release the amp relay until RF has ceased. Many use the same relay to key the amp and switch from TX to RX. Mike, W1NR most of their attention on speeding up the relay; /archives//html/Amps/2001-02/msg00268.html (7,834 bytes)
14. [AMPS] HV Cable (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Fri, 5 Jan 2001 23:07:52 -0500; The stuff I have is Belden 8898 10KV rubber test prod wire. Alpha also makes an equivalent. 8866 is corona wire for CRT anode's and is many times more expensive. You can find test prod wire at Mouser; /archives//html/Amps/2001-01/msg00189.html (8,468 bytes)
15. [AMPS] Amps with QSK (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Fri, 12 Jan 2001 14:24:05 -0500; Most Ameritron's can be ordered with QSK. They also sell a PIN diode box to add to just about any amp made. All current Alpha's are QSK. Mike, W1NR Hello out there! Can anyboydy tell me which amps ha; /archives//html/Amps/2001-01/msg00347.html (7,629 bytes)
16. [AMPS] Clipperton L amplifier (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Wed, 17 Jan 2001 13:13:26 -0500; The amp I had used relays to switch the input coils, thus isolating them from the input bandswitch. In fact, I think that this was a retrofit. If I recall, the factory stock version had no tuned inpu; /archives//html/Amps/2001-01/msg00425.html (9,665 bytes)
17. [AMPS] Two XFMR in parallel (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Thu, 18 Jan 2001 08:21:09 -0500; The Radio Handbook shows a method of balancing two transformers using the secondary winding of a third transformer to balance the load between the two. I have never tried this, but it looks good in t; /archives//html/Amps/2001-01/msg00460.html (8,165 bytes)
18. [AMPS] linear amps (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Tue, 30 Jan 2001 15:40:26 -0500; Here's a bunch... http://www.arrl.org:80/tis/info/amplifir.html Mike, W1NR Are there any other source for schematics on the web, other than the MFJ site (which only has the 811A based amplifier schem; /archives//html/Amps/2001-01/msg00733.html (8,407 bytes)
19. [AMPS] Advice On Homebrewing Chassis Please (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Mon, 25 Dec 2000 08:46:55 -0500; Equipping a shop to turn out chassis in mass is quite a chore. Rather than standard aluminum boxes, which are available from many sources, I would rather see enclosures that are designed for the cool; /archives//html/Amps/2000-12/msg00304.html (9,934 bytes)
20. [AMPS] G-G Input circuit for multiple filament transformers? (score: 1): Author: w1nr@eecorp.com (Mike McCarthy, W1NR); Date: Wed, 27 Dec 2000 20:36:08 -0500; Hello all, Does anyone have any knowledge about how I go about feeding a dual 4-1000A grounded grid amplifier with a dual 7.5V 21A CT secondary filament transformer? I am unable to find any examples; /archives//html/Amps/2000-12/msg00327.html (7,489 bytes)

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