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Total 21 documents matching your query.

1. Re: [Amps] Oscilloscope Purchase (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Tue, 26 Jun 2012 23:30:54 -0400
Hi, New to list, but had to chime in that I really like my Tek 465 also. A 2447 would be nice, though. That's what I had on my bench at work. Miss the extra goodies. -- -- -- Jim, W2XO ______________
/archives//html/Amps/2012-06/msg00414.html (7,933 bytes)

2. Re: [Amps] Oscilloscope Purchase (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Wed, 27 Jun 2012 00:22:53 -0400
Mine is a "B". Yep, mighty fine... Plain vanilla is good sometimes! -- -- -- 73 de Jim, W2XO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
/archives//html/Amps/2012-06/msg00416.html (11,022 bytes)

3. [Amps] More Scope talk (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Wed, 27 Jun 2012 00:30:13 -0400
Speaking of the 24XX series Tek scopes, I have one here that was given a salt bath (TV truck with racks in back, leaky door, all the way from the West Coast to Pennsylvania in winter). It was immedia
/archives//html/Amps/2012-06/msg00417.html (6,681 bytes)

4. [Amps] 6 foot racks with doors for sale (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sat, 30 Jun 2012 18:29:51 -0400
I have a couple enclosed 6 foot racks with rear doors and partial front doors. $50 each. Inside depth 22 1/4 inches. Partial doors are 20 1/2 inches high. Rails are tapped 12-24. Located near Pittsbu
/archives//html/Amps/2012-06/msg00452.html (6,992 bytes)

5. [Amps] Henry 2K-2 3-500 mod (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sun, 5 Aug 2012 13:45:43 -0400
I'm looking for some info from someone who has actually done the mod to put 3-500's in a Henry 2k-2. My 3-400s finally bit the dust after years of service and its time to think about putting 3-500s i
/archives//html/Amps/2012-08/msg00108.html (8,075 bytes)

6. Re: [Amps] Henry 2K-2 3-500 mod (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sun, 5 Aug 2012 19:24:34 -0400
Hi Guys, Thanks for all the replies on the Henry. As always happens, the problem kind of resolved itself. I borrowed a 3-500 and checked my clearances for air and found that the 3-500 envelope does n
/archives//html/Amps/2012-08/msg00112.html (7,808 bytes)

7. Re: [Amps] Henry 2K-2 3-500 mod (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Mon, 6 Aug 2012 01:52:26 -0400
Interesting idea. I think I'm OK after checking. The W6SAI "West Coast Handbook" shows a gap of .375 inches (I have .39) will work at 3500 volts with RF on also, so should be good at 3KV. Thanks and
/archives//html/Amps/2012-08/msg00114.html (7,869 bytes)

8. Re: [Amps] Schematics for 4CX250B GG HF amplifier (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sat, 11 Aug 2012 01:28:40 -0400
You might have a look at this manual on BAMA for a Tokyo High Power amp with 2 4cx250b's for ideas. http://bama.edebris.com/manuals/tokyohpl/hl1ka -- Jim, W2XO _______________________________________
/archives//html/Amps/2012-08/msg00171.html (7,241 bytes)

9. Re: [Amps] non traditional linear (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sun, 12 Aug 2012 22:04:53 -0400
Better yet, find one of the old Gateways that was horizontal and built like a tank. I recall they had two 'full height' drive slots so plenty of panel room. Hmmmm..... -- Jim , W2XO _________________
/archives//html/Amps/2012-08/msg00182.html (8,998 bytes)

10. Re: [Amps] Multiple Amplifier Switching Box (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Thu, 23 Aug 2012 21:27:58 -0400
Ummm., I believe the original poster was talking about using power splitters at the input and combiners at the output of two medium-power amps to achieve QRO with less expensive amps. We had a 30kw H
/archives//html/Amps/2012-08/msg00375.html (9,430 bytes)

11. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sat, 25 Aug 2012 18:12:39 -0400
Yes. I remember RCA made an AM broadcast rig called the "Ampliphase" that used two tubes 90deg out of phase and obtained AM by phasemodulating one of the tubes' RF input to 0 deg or 180 deg compared
/archives//html/Amps/2012-08/msg00419.html (9,658 bytes)

12. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: James Durham <jimdur@gmail.com>
Date: Sat, 25 Aug 2012 21:36:01 -0400
Non-affectionately known as the "Amplifuzz". Need I say more? You mean it had GOOD PARTS! -- Jim, W2XO _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2012-08/msg00427.html (9,186 bytes)

13. [Amps] SCR to adjust 240v to 200v (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Fri, 12 Aug 2016 13:07:17 -0400
Hello all, This is my first posting, so Howdy.. I have a Henry 2k-2 (modified to take 3-500Zs). After I bought it, some years back, I fired it up and tube filaments were very bright and HV was high.
/archives//html/Amps/2016-08/msg00007.html (7,182 bytes)

14. Re: [Amps] SCR to adjust 240v to 200v (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Fri, 12 Aug 2016 17:11:05 -0400
My real reason for asking was not whether the SCR would work to vary the voltage, that's done all the time, but it does put spikes in the AC waveform. I'm sure Henry never anticipated such and how th
/archives//html/Amps/2016-08/msg00011.html (10,467 bytes)

15. Re: [Amps] SCR to adjust 240v to 200v (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Sat, 13 Aug 2016 11:11:33 -0400
Thank you, Boye (OZ7C) and the others that replied. I think I did not explain my project clearly. First of all, yes, I know about buck transformers. I am using a Variac, which does the same thing and
/archives//html/Amps/2016-08/msg00013.html (9,887 bytes)

16. Re: [Amps] Drake W4 meter (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Mon, 26 Jun 2017 23:35:36 -0400
A Simpson 260 VOM has a 200 ua meter. Maybe find a broken 260 with good meter movement? An old Bird inline wattmeter with remote meter has 200ua meter also. Good Luck. 73 Jim, W2XO Tnx, Jim W8ZR ____
/archives//html/Amps/2017-06/msg00283.html (7,646 bytes)

17. [Amps] Panel Meters (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Sat, 3 Mar 2018 11:54:59 -0500
I am trying to reduce my 1/2 basement full of electronics stuff to some reasonable size.  I have a collection of panel meters, mostly 3 and 4 inch, square and round, various ranges, etc.  I listed th
/archives//html/Amps/2018-03/msg00009.html (6,401 bytes)

18. Re: [Amps] Need manual for Viewstar PT2500A (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Mon, 25 Jun 2018 12:01:12 -0400
--Jim, W2XO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2018-06/msg00026.html (7,350 bytes)

19. Re: [Amps] 3-500Z labeling (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Sat, 8 Dec 2018 00:09:08 -0500
Hey Paul, Look very hard in a good light. I think I have seen labeling on older tubes fade so badly that it looks like there is nothing there. 73, Jim, W2XO - Paul  KW7Y _____________________________
/archives//html/Amps/2018-12/msg00045.html (7,816 bytes)

20. Re: [Amps] Henry 2K desktop amp (score: 1)
Author: Jim Durham <jimdur@gmail.com>
Date: Sat, 29 Jun 2019 12:59:13 -0400
On 6/27/19 11:46 AM, Ted Rachwal wrote: All of a sudden I have a very high swr between the rig and amp...3:1.... I notice one of the 3500Z tubes is not lit.  I'm wondering if I can pull the unlit 3-5
/archives//html/Amps/2019-06/msg00077.html (8,978 bytes)

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