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Total 406 documents matching your query.

21. Re: [Amps] 3CX400/3CX800 Socket (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Mon, 30 Jan 2012 09:37:58 -0800
What happens, I think, is that the RF heats any ferrous metal, making it oxidize. That's why hardware in RF fields needs to be non-ferrous. I suspect it must be getting red-hot in order to do that. W
/archives//html/Amps/2012-01/msg00294.html (8,814 bytes)

22. Re: [Amps] reducing the reactance of a wirewound resistor (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sun, 05 Feb 2012 16:01:20 -0800
What HB9SLV suggested was not exactly an Aryton-Perry winding, although the principle is the same. Instead of being in parallel, his idea had the windings in series. So they will always carry the sam
/archives//html/Amps/2012-02/msg00030.html (11,203 bytes)

23. Re: [Amps] BC-375E Switch (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Mon, 06 Feb 2012 07:58:23 -0800
They are good for high current, but not so much for high voltage. I replaced one in a friend's 4-1000A amplifier after it was damaged by corona-induced arcing. The amp was running at 3600v. -- Vic, K
/archives//html/Amps/2012-02/msg00039.html (7,993 bytes)

24. Re: [Amps] SB-200 (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 08 Feb 2012 21:27:19 -0800
Take a very close look at the bandswitch contacts that are connected to those switched caps. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _______________________________________________ Amps mai
/archives//html/Amps/2012-02/msg00065.html (8,265 bytes)

25. Re: [Amps] Source for plate xfrmer (score: 1)
Author: "Vic, K2VCO" <k2vco.vic@gmail.com>
Date: Wed, 15 Feb 2012 15:21:21 -0800
What would be the point of using it in an amplifier power supply? An arc would turn tubes (etc.) into plasma. It's like using a howitzer to go dove hunting. On the other hand, if you are building a D
/archives//html/Amps/2012-02/msg00186.html (11,132 bytes)

26. Re: [Amps] TL 922A (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 28 Feb 2012 09:21:25 -0800
Look at the bandswitch contacts. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma
/archives//html/Amps/2012-02/msg00317.html (7,087 bytes)

27. Re: [Amps] Relay suggestions please (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 09 Mar 2012 08:47:00 -0800
A failure mode that I've encountered has been with some relays that have the moving arms riveted to an insulating bar made of some form of plastic. RF losses in the plastic cause it to heat, burn and
/archives//html/Amps/2012-03/msg00078.html (11,536 bytes)

28. Re: [Amps] question for you experts... (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 27 Mar 2012 17:45:51 -0700
The reason that's usually given for this choke is as you say, in order to protect the operator in the event that the blocking capacitor breaks down. But I have also had the same thought that you have
/archives//html/Amps/2012-03/msg00282.html (8,803 bytes)

29. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 30 Mar 2012 08:08:21 -0700
I often wonder why so many amplifiers are designed so that the full ZSAC flows when the user isn't actually transmitting. I always install a circuit in my QSK amplifiers which cuts off the plate curr
/archives//html/Amps/2012-03/msg00357.html (10,249 bytes)

30. Re: [Amps] FWD: Ham Radio Amp - $8500 (Louisville Ky) 3CX10000-a7 (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 05 Apr 2012 10:58:25 -0700
A pair of 4-400A's is not enough to plate modulate a 3cx10000A at full input. I bet it is a one-bander (and not 160 meters, either)! -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ________________
/archives//html/Amps/2012-04/msg00058.html (9,706 bytes)

31. Re: [Amps] TL922 Fan (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 13 Apr 2012 08:39:17 -0700
Isaac, Actually it is 100v, Japanese made. It is connected across only one of the primary windings. My amplifier is the non-US version, which operates on either 200, 220 or 240 VAC. You can use a 120
/archives//html/Amps/2012-04/msg00128.html (7,403 bytes)

32. Re: [Amps] SWR increase on SB-220 input - my face is red (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 01 May 2012 16:53:34 -0700
I would also replace the springs that clamp the filament pins. The heat weakens them and then it's a vicious cycle. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________________
/archives//html/Amps/2012-05/msg00041.html (9,821 bytes)

33. Re: [Amps] soldering vs crimping (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 02 May 2012 10:12:37 -0700
It's not tricky if you have three things: 1) The right soldering iron. I have a Weller W100P that I use for this. It's also handy for copper tubing and strap in tank circuits, etc. It has a large the
/archives//html/Amps/2012-05/msg00065.html (10,105 bytes)

34. Re: [Amps] Fwd: Re: soldering vs crimping (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 02 May 2012 10:14:24 -0700
I tin it and then use a tubing cutter to trim it. Very neat job. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2012-05/msg00066.html (8,786 bytes)

35. Re: [Amps] ANOTHER L4B EBAY (same seller) (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 08 Jun 2012 07:52:16 -0700
As a working amplifier, the L4B is nicely constructed, but so are a number of others. And it doesn't have 160 meters, pretty important these days. I personally don't get the 'collector mentality' --
/archives//html/Amps/2012-06/msg00041.html (11,545 bytes)

36. [Amps] 4CX1500B's -- worth using? (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 20 Jun 2012 09:28:29 -0700
I just found a couple of 4CX1500B's among my junk (I had thought they were 4CX1000's). I was surprised to see that the data sheet indicates that typical operation of a single tube as an AB2 linear am
/archives//html/Amps/2012-06/msg00292.html (7,328 bytes)

37. Re: [Amps] latest amplifier wonder (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 06 Jul 2012 09:33:51 -0700
It's hard to tell from the pictures, but probably it's the pi network INPUT capacitor that is missing, and the original input capacitor is used to provide part of the output (loading) capacity. There
/archives//html/Amps/2012-07/msg00037.html (8,441 bytes)

38. Re: [Amps] Coil Tapping (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sun, 15 Jul 2012 23:26:23 -0700
Yes, you leave the tubes in place and the choke. The output capacity of the tubes and the strays from the choke are part of the circuit. Of course the amp power is OFF! -- Vic, K2VCO Fresno CA http:/
/archives//html/Amps/2012-07/msg00201.html (8,304 bytes)

39. Re: [Amps] More FS items (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 24 Jul 2012 08:48:06 -0700
This prompts me to mention that I've used a lot of meters like this on aluminum panels. They read low, and it is easy to modify internal shunts to correct them. Often there is an internal shunt and s
/archives//html/Amps/2012-07/msg00258.html (7,212 bytes)

40. [Amps] Overdrive protection (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 26 Jul 2012 09:36:00 -0700
Alpha's email newsletter talks about damage to amplifiers as a result of overdrive -- the example is given of amplifiers designed to produce 1500w output with 40w drive being driven with 150w. They s
/archives//html/Amps/2012-07/msg00268.html (7,646 bytes)

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