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References: [ +from:roger@rogerhalstead.com: 17 ]

Total 17 documents matching your query.

1. Re: [Amps] pulse tuning (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Mon, 20 Sep 2010 12:44:23 -0400
When tuning most of today's amps the best we come up with an approximation of best tuning. It may be a very close approximation, but it's highly unlikely "right on". Still, *usually* is good enough.
/archives//html/Amps/2010-09/msg00243.html (8,642 bytes)

2. [Amps] Why are 833s so Expensive (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Sun, 26 Sep 2010 20:28:45 -0400
Subject pretty much says it all. 833s are running over $125 ($258 for a pair) each although they vary from $100 to $200 each on e-bay. I don't know if they are selling any, but the price has been tha
/archives//html/Amps/2010-09/msg00315.html (7,431 bytes)

3. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Mon, 27 Sep 2010 00:41:00 -0400
At least it'll be impressive looking. Staying within the ratings, they are derated in a hurry as you go up in frequency, but OTOH the GU81M is noted for being rugged. How far they can be pushed? I do
/archives//html/Amps/2010-09/msg00326.html (11,804 bytes)

4. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Mon, 27 Sep 2010 12:50:15 -0400
I'm sorry for the delay in answering by I was injured by flying glass when my BS meter exploded. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2010-09/msg00359.html (11,017 bytes)

5. Re: [Amps] GU-74b amp by UX1UX (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Fri, 16 Aug 2013 19:15:00 -0400
Rudy is using the Chinese FU728F which is the Equivalent of a 4CX1500B except for filament voltage and the centering pin size in the socket. They are physically quite different from the GU84B It wil
/archives//html/Amps/2013-08/msg00113.html (11,634 bytes)

6. Re: [Amps] Making holes for amps (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Fri, 13 Sep 2013 15:59:12 -0400
I had an old Sears X-Y drill press attachment and made a small fixture to hold a Dremel tool which held a 1/8" milling bit. I then placed this on the surface of the area that needed to be slotted and
/archives//html/Amps/2013-09/msg00189.html (10,493 bytes)

7. Re: [Amps] MOVs (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Fri, 24 Jan 2014 12:12:13 -0500
On 1/24/2014 1:37 AM, Jim Brown wrote: On 1/23/2014 10:02 AM, Carl wrote: Inductive industrial equipment use big MOV's for spike suppression on single and 3 phase lines of many voltages. Again, the p
/archives//html/Amps/2014-01/msg00246.html (11,361 bytes)

8. Re: [Amps] MOVs (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Mon, 27 Jan 2014 03:55:21 -0500
On 1/26/2014 1:05 AM, John Lyles wrote: I have had a pair of large Harris MOVs across my main panel to neutral and line to line, for 21 years now. They are fed through a double pole breaker and there
/archives//html/Amps/2014-01/msg00342.html (12,328 bytes)

9. Re: [Amps] Weird tubes in an amplifier (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Wed, 29 Jan 2014 17:21:31 -0500
REPLY: The 6AG7 was a great tube in its day. Had about the highest transconductance of any consumer-type tube as I recall. Originally used as a video output amplifier in early black and white TVs I n
/archives//html/Amps/2014-01/msg00343.html (10,542 bytes)

10. Re: [Amps] Fan Noise in GS-35b Amplifiers (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Thu, 20 Feb 2014 12:30:32 -0500
Is it the blower that is noisy, or the air that is noisy? On my 4CX-1500B/FU728F the noise fron the exhaust is far louder than the fan and particularly in "high blower" A comment on "off axis air flo
/archives//html/Amps/2014-02/msg00249.html (11,568 bytes)

11. Re: [Amps] Fan Noise in GS-35b Amplifiers (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Thu, 20 Feb 2014 23:53:16 -0500
On 2/20/2014 9:59 AM, Jack C. Shutt wrote: Yes, water cooling would be really neat! I understand that the GS-35a version of the tube has a water-jacket, but you never see those for sale. I have seen
/archives//html/Amps/2014-02/msg00250.html (14,329 bytes)

12. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Fri, 28 Feb 2014 11:39:34 -0500
On 2/28/2014 9:42 AM, Hardy Landskov wrote: All, Has anyone used this power? If so, what is your opinion/facts of how your project turned out? Any special precautions needed? Thanks ahead of time. 73
/archives//html/Amps/2014-03/msg00013.html (9,255 bytes)

13. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Sat, 01 Mar 2014 10:41:20 -0500
On 3/1/2014 10:09 AM, Jim Thomson wrote: Date: Fri, 28 Feb 2014 17:37:48 +0100 From: peter chadwick <g8on@fsmail.net> To: MU 4CX250B <4cx250b@miamioh.edu>, Fuqua Bill L <wlfuqu00@uky.edu> Cc: "amps@c
/archives//html/Amps/2014-03/msg00014.html (13,405 bytes)

14. Re: [Amps] Cool Amp Silver Plating (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Mon, 03 Mar 2014 12:20:33 -0500
We use it often at work. It's expensive. It doesn't do squat for improving the conductivity of surfaces like cavities and inductors for RF current, as Peter pointed out. That requires at least 3 to 5
/archives//html/Amps/2014-03/msg00022.html (10,745 bytes)

15. Re: [Amps] ALS-600 vs ALS-1300 (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Fri, 11 Apr 2014 00:13:12 -0400
Too bad the Tokyo Hy Power amps are no longer made. They were good looking, well made, good performing amps First, I agree with W6WRT. For DXing, especially on 80/160m, you should have a legal limit
/archives//html/Amps/2014-04/msg00135.html (11,921 bytes)

16. Re: [Amps] ALS-600 vs ALS-1300 (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Sun, 13 Apr 2014 19:59:51 -0400
REPLY: Certainly true, and the "fools" label applies to both designers and users. Do the 600s work well? If so, there is nothing wrong with using a pair of them with dividers and combiners. It's a ve
/archives//html/Amps/2014-04/msg00146.html (9,970 bytes)

17. Re: [Amps] WOW! (score: 1)
Author: Roger <roger@rogerhalstead.com>
Date: Mon, 28 Mar 2016 18:44:13 -0400
Looks Gassy to me 73 Roger (K8RI) 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ 73, Roger _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2016-03/msg00046.html (8,676 bytes)

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