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21. Re: [Amps] Transistor Lifetime (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Fri, 4 Jul 2008 22:36:44 +0300
...forget it! The transistors, and for that matter all semiconductors, manufactured over the last 20 years incorporate a passivation layer of glass or silicon nitride on the chip. None rely on the ca
/archives//html/Amps/2008-07/msg00038.html (8,734 bytes)

22. Re: [Amps] Load Cap in TL-922A (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Sat, 5 Jul 2008 01:59:13 +0300
...check at the backside of the spindle: a sizeable number of these cap shave one complete with locknut. It sets the centering of the rotor inside the stator and occasionally it loosens up. If its on
/archives//html/Amps/2008-07/msg00042.html (8,030 bytes)

23. Re: [Amps] A Grounded Grid biasing question (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Wed, 9 Jul 2008 21:08:36 +0300
...you misunderstood the schematic: the bias generator is supplying bias just to the 2 opamps in order to set the trip reference. The tube is controlled by the IRF 540 as a two state switch only, mov
/archives//html/Amps/2008-07/msg00089.html (9,512 bytes)

24. Re: [Amps] A Grounded Grid biasing question (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Thu, 10 Jul 2008 07:31:16 +0300
...noooo, it doesn't: the source of the FET is connected to the -HV point through the 0.1 resistor! This is where it goes when the FET turns on. The FET is just replaces the usual Operate/ Standby sw
/archives//html/Amps/2008-07/msg00094.html (11,652 bytes)

25. Re: [Amps] Silver Strap (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Fri, 11 Jul 2008 13:27:59 +0300
I would also like to remind you of something: if my memory serves me still right, all oxides except silver are insulators so that if they appear they're out of the game as conducting media. My guess
/archives//html/Amps/2008-07/msg00104.html (10,418 bytes)

26. Re: [Amps] Silver Strap (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Fri, 11 Jul 2008 21:59:55 +0300
I am a little afraid of it. In my experience, this is good for a chassis work, but not for lines carrying RF. Alex 4Z5KS It seems the preponderance of thinking is it would be nice to do something rat
/archives//html/Amps/2008-07/msg00111.html (9,043 bytes)

27. Re: [Amps] New Tubes - Question (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Sun, 20 Jul 2008 01:43:43 +0300
Hi guys: The getter of the tube is intended to work during the air evacuation from the tube during the manufacture, not during any burn in. That is also a leftover from past times, when sometimes the
/archives//html/Amps/2008-07/msg00160.html (8,943 bytes)

28. Re: [Amps] Dentron MLA2500 SWR Question (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 1 Aug 2008 19:42:12 +0200
Hi Adrian: It's not hysteresis! What happens is more akin with motor boating: the power cutback isn't instantaneous, so that it takes a little time for it to activate and then to release when it dete
/archives//html/Amps/2008-08/msg00004.html (11,760 bytes)

29. Re: [Amps] 3-500Z glitch resistor (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 9 Sep 2008 14:10:15 +0300
By the way, for 40 years I knew it WAS supposed to burn out and protect everything! And how, for heaven's sake, did you get to that name? for the last 60 years it's been called a surge protecting res
/archives//html/Amps/2008-09/msg00069.html (17,615 bytes)

30. Re: [Amps] Core wrapping? (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sun, 16 Nov 2008 17:00:21 +0200
...first, core wrapping stems from the time when cores were unpainted. Indiana General were notorious! Second, the wrapping was done in order to avoid arcing to the core at a time when wire insulatio
/archives//html/Amps/2008-11/msg00161.html (8,784 bytes)

31. Re: [Amps] amp repair/modification (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Tue, 2 Dec 2008 19:52:07 +0200
...THE one thing to watch for is the air capacitors' plate spacings- if they can sustain the new voltages, otherwise you probably can get by- of course bearing in mind that the taps on the tank coils
/archives//html/Amps/2008-12/msg00042.html (8,582 bytes)

32. Re: [Amps] Plate choke resonance and safe operation (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sun, 7 Dec 2008 18:42:22 +0200
A reasonable estimate would be about +- 10%away from the bands' edges: if you get a reasonable impedance that far off, you can assume to be safe. Alex 4Z5KS SunWolf "Jesus, come get your kids, they'r
/archives//html/Amps/2008-12/msg00143.html (10,488 bytes)

33. Re: [Amps] Plate choke resonance and safe operation (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Sun, 7 Dec 2008 20:40:41 +0200
...well, if you need them so close, have a look at the multisection ,pie wound chokes from James Millen. They have unequal sections, each with its own, different resonant frequency . they're supposed
/archives//html/Amps/2008-12/msg00147.html (12,519 bytes)

34. Re: [Amps] High Voltage Wire (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Wed, 24 Dec 2008 18:12:10 +0200
...yes, this is the best one. Just make sure you don't install by mistake the carbon core type; it more prevalent today so be specific when you order it! A Alex 4Z5KS "Jesus, come get your kids, they
/archives//html/Amps/2008-12/msg00315.html (8,279 bytes)

35. Re: [Amps] switchable zener cathode bias (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Wed, 31 Dec 2008 17:08:43 +0200
...put the 2 in series! Choose the smaller one for whatever voltage you need and the second equal to the difference of the smaller voltage and the higher one. Then you can short out the second one wi
/archives//html/Amps/2008-12/msg00382.html (9,492 bytes)

36. Re: [Amps] plate bypass caps (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 13 Jan 2009 09:57:32 +0200
...OK guys! Just please remember: the RF current at the choke's base can be quite high, so RF withstanding current must be quite high! Apart from that, it's better to use different kinds of capacitor
/archives//html/Amps/2009-01/msg00105.html (9,743 bytes)

37. Re: [Amps] Hi-G d'Italia relays (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 20 Jan 2009 14:07:45 +0200
...lengthen the existing cable! Splice an additional length of Teflon based cable to the existing one. No matter what slice you choose to do, it's VERY unlikely to cause you trouble in the HF range.
/archives//html/Amps/2009-01/msg00184.html (8,628 bytes)

38. Re: [Amps] Silver plated braid (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 22 Jan 2009 08:37:29 +0200
...why do you need silver plated braid? At these frequencies the copper conducts almost as well as silver plated metal! In a plate tank circuit the impedances are reasonably high, so that the few mil
/archives//html/Amps/2009-01/msg00232.html (9,151 bytes)

39. Re: [Amps] Regulated DC heater (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Mon, 26 Jan 2009 19:01:08 +0200
...definitely NO! Remember: by definition the RMS voltage is already equal to the DC voltage that does the same work. That means 5V RMS is equal to 5VDC! The RMS value of a 7 Volt peak source would b
/archives//html/Amps/2009-01/msg00300.html (10,475 bytes)

40. Re: [Amps] Source for good YC156 tubes and hv oil capacitors (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Tue, 27 Jan 2009 23:20:19 +0200
Hello guys: I would like to share a point that I learned from 4X1AT- sadly, a silent key by now. He was the transformer guru in Israel. I inherited a 4-1000 amplifier built by him. By itself, it was
/archives//html/Amps/2009-01/msg00324.html (11,204 bytes)

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