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Total 73 documents matching your query.

21. [Amps] 8877 Grid Trip timing (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Tue, 2 Oct 2007 14:23:53 +0000
In a posting about QSK Tom, W8JI wrote, and got me thinking: "A set of 3CX800's can be ruined in just seconds of operation with excessive grid dissipation." I am working on a homebrew 8877 amp here a
/archives//html/Amps/2007-10/msg00017.html (7,378 bytes)

22. [Amps] 8877 Grid Trip timing (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Tue, 2 Oct 2007 17:35:01 +0000
Ok that convinces me, I will remove the electrolytic across the relay. The design of this amp is based on a QST series back in about 1986. The author of the article built another one that is feature
/archives//html/Amps/2007-10/msg00020.html (7,303 bytes)

23. [Amps] I miss some regulars (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 9 Nov 2007 01:50:27 +0000
Last seen on amps reflector: rbonner - Bob DD - August 2007 W8JI - Tom - Oct 12, 2007 Hey Guys, I miss you. I am sure many others do too. Are you ok? I really miss your words of wisdom on here. Rick
/archives//html/Amps/2007-11/msg00119.html (6,739 bytes)

24. [Amps] 2 Tubes in Parrallel (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 9 Nov 2007 02:08:27 +0000
If you had 3600 volts on the plates you should calculate based on about 666 ma, which equals 2400 watts input, which in turn will give you about 1500 very cool conservative watts out. This is a plate
/archives//html/Amps/2007-11/msg00121.html (7,158 bytes)

25. [Amps] 8877 Filament choke (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Thu, 15 Nov 2007 14:26:32 +0000
Info in the ARRL handbook seems to indicate that it might be better to not use a filament choke on an 8877 amplifier, that it might cause more problems than it solves. I wonder what you guys who have
/archives//html/Amps/2007-11/msg00202.html (7,222 bytes)

26. [Amps] 8877 plate voltage (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Thu, 15 Nov 2007 14:34:24 +0000
I have just no-load tested my homebrew power supply for my 8877 amp. The transformer is rated 2900 volts at 1 amp. I am getting 4200 volts with just bleeder load on it. This is above the maximum rati
/archives//html/Amps/2007-11/msg00203.html (7,432 bytes)

27. Re: [Amps] 8877 Filament choke (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 16 Nov 2007 00:05:21 +0000
Thanks for all the opinions Guys. I went back and read the stuff in the ARRL handbook about this subject and it appears they are concerned about a series resonance with the choke and capacitance that
/archives//html/Amps/2007-11/msg00215.html (10,072 bytes)

28. Re: [Amps] [AMPS] Drake L-4 negative grid current reading on meter (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Wed, 21 Nov 2007 21:18:12 +0000
A few weeks ago The surge resistor did not let go because a cap failed, at least not directly. It is in the B+ line to the amp so it failed because too much current went through it. I replaced all th
/archives//html/Amps/2007-11/msg00310.html (8,847 bytes)

29. Re: [Amps] Drake L4B/8877 Retrofit Problem (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Tue, 11 Dec 2007 00:54:49 +0000
Ron, Did you ever try the exercise of putting an approximately 3500 ohm resistor across the tune cap to simulate tube driving Z and looking into the loading cap with an antenna analyzer, looking for
/archives//html/Amps/2007-12/msg00125.html (7,887 bytes)

30. [Amps] Caution buying from Anna's CW Store on eBay (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Wed, 9 Jan 2008 15:50:38 +0000
Just to let you guys know, use caution of you are considering buying from Anna's CW Store on eBay. They offer lots of high power parts such as doorknob capacitors from the Ukraine. I noticed one of t
/archives//html/Amps/2008-01/msg00084.html (7,040 bytes)

31. Re: [Amps] QST SB-220 Article (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Wed, 26 Mar 2008 13:32:44 +0000
Good one, Pete!!!!! I have, like you, been waiting, and wondering when this story would hit the news. In fact I went back in my alibrary of QSTs and tried to find where there was any kind of stateme
/archives//html/Amps/2008-03/msg00275.html (7,566 bytes)

32. Re: [Amps] SB-220 (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 28 Mar 2008 00:14:39 +0000
?????????????? The SB-220 is a stable, well behaved amplifier. Self oscillation? Read QST Sept. 1994 page 71 before you do anything. Oh, there are things you might want to do, but be sure you read t
/archives//html/Amps/2008-03/msg00297.html (7,055 bytes)

33. Re: [Amps] Refurbishing old amps (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 28 Mar 2008 16:55:12 +0000
Do not use Acetone on painted surfaces, or they won't be painted any longer. Some say Windex is a good all around cleaner for removing grime, safe and cheap. WD40 maybe, but will probably spark a de
/archives//html/Amps/2008-03/msg00316.html (8,563 bytes)

34. Re: [Amps] 2 x 3/400z (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Thu, 1 May 2008 14:53:59 +0000
I think you need much more voltage. Rick K2XT _________________________________________________________________ Make i'm yours.  Create a custom banner to support your cause. http://im.live.com/Mess
/archives//html/Amps/2008-05/msg00001.html (6,642 bytes)

35. [Amps] Any Amp News from Dayton (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Tue, 20 May 2008 01:57:00 +0000
You guys who went to Dayton, Was there anything new in the world of amps shown at the Hamvention this year? Ameritron, Acom, Alpha, QRO - any of these amp companies doing anything new? Rick K2XT ____
/archives//html/Amps/2008-05/msg00125.html (7,390 bytes)

36. Re: [Amps] Need help understanding an old Transformer (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Mon, 26 May 2008 16:34:41 +0000
I THINK you are going to use a full wave rectifier (2 strings of modern diodes), into a choke, and get 3000 volts out, at 500 ma = 1500 watts. Perfect, right at the legal limit. (Ignoring bleeder lo
/archives//html/Amps/2008-05/msg00192.html (8,161 bytes)

37. Re: [Amps] Need help understanding an old Transformer (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Mon, 26 May 2008 19:18:05 +0000
Ye Gads, what got into me? In my haste to get an answer out I blew it entirely. Carl, why is that? Rick K2XT _________________________________________________________________ Keep your kids safer on
/archives//html/Amps/2008-05/msg00199.html (8,217 bytes)

38. Re: [Amps] illegal amps? (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 29 Aug 2008 15:36:19 +0000
Want to have some fun? Generate a new ebay ID. Bid on the amp at the last minute, a big $$ amount, win the auction. Then disappear. Or you can play by the rules and complain to ebay. But they will ig
/archives//html/Amps/2008-08/msg00155.html (7,388 bytes)

39. Re: [Amps] Parts Begging not really begging just asking (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Thu, 4 Sep 2008 08:46:14 +0000
In the same way that Lou W1QJ and Jim K7RDX take care of my needs from their junk boxes when needed Jeffs feedthrough insulator needs have been met. He still needs meters though. Rick K2XT __________
/archives//html/Amps/2008-09/msg00012.html (7,002 bytes)

40. Re: [Amps] alpha 91b help (score: 1)
Author: Rick Stealey <rstealey@hotmail.com>
Date: Wed, 15 Oct 2008 18:46:37 +0000
If that is a resistor that is in series with the primary of the power transformer that is supposed to be shorted out after a second or so it is very likely that you have a condition in either the tra
/archives//html/Amps/2008-10/msg00069.html (7,784 bytes)

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