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References: [ +from:paul.kelley.n1bug@gmail.com: 16 ]

Total 16 documents matching your query.

1. Re: [Amps] re specs on Rotron 110AS blower (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Sat, 18 Aug 2007 20:54:10 -0400
I can't help you with specs for that Rotron, but high speed blowers are often noisy. I have been happy with my Dayton 2C647 blowers on two amps. They run at 1500 RPM, and while certainly not silent t
/archives//html/Amps/2007-08/msg00113.html (7,705 bytes)

2. [Amps] amp schematic drafting? (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Thu, 06 Mar 2008 14:39:39 -0500
I hope this isn't too far off topic... Can anyone recommend free or low cost software for drawing tube amplifier schematics? I have been searching for some time but haven't found anything with a comp
/archives//html/Amps/2008-03/msg00060.html (7,392 bytes)

3. [Amps] Tuned input and 4CX1500B cathode impedance (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Tue, 25 Mar 2008 08:22:47 -0400
Fellow amp addicts, I have been building amps for years but I am on somewhat new ground here. I am trying to estimate the drive impedance of a 4CX1500B in order to design a tuned input with minimal g
/archives//html/Amps/2008-03/msg00250.html (8,501 bytes)

4. Re: [Amps] Relays (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Sun, 30 Mar 2008 14:09:43 -0400
Thanks Tim, That is reassuring. I have been using RJ1A relays in my HF single 4CX1500B for some time and have yet to experience a failure. I run QSK CW frequently. I am also using them on my new 6m 4
/archives//html/Amps/2008-03/msg00361.html (9,354 bytes)

5. Re: [Amps] Relays (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Mon, 31 Mar 2008 07:47:12 -0400
Nice work Larry. I haven't personally tested enough radios to be sure but I have a strong hunch most of the newer radios are better than some of the older ones in this respect. The radio with 3 ms wa
/archives//html/Amps/2008-03/msg00384.html (9,904 bytes)

6. [Amps] 4CX1500B cathode tuned input (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Tue, 01 Apr 2008 09:26:23 -0400
Thanks to all who responded to my recent question about tuned input for a cathode driven 4CX1500B. Special thanks to N1RJ for taking the time to investigate why I was getting erroneous and confusing
/archives//html/Amps/2008-04/msg00009.html (8,393 bytes)

7. Re: [Amps] Relays (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Thu, 03 Apr 2008 14:28:21 -0400
I think you are asking about "store bought" amps, which I can't address. Certainly for homebrew amps using smallish vacuum relays it is easy to get in the 4-5ms range or less. As has been mentioned,
/archives//html/Amps/2008-04/msg00078.html (8,266 bytes)

8. Re: [Amps] Help with ARRL handbook design 4CX1000A 2m PA (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Mon, 21 Jul 2008 20:29:45 -0400
I think there must be some problem unique to your specific amplifier. I built and used that amp for several years with good results, efficiency close to 60%. I have read your subsequent responses to
/archives//html/Amps/2008-07/msg00197.html (8,954 bytes)

9. Re: [Amps] Help with ARRL handbook design 4CX1000A 2m PA (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Tue, 22 Jul 2008 06:55:43 -0400
Pete, That does seem strange. Grid current should be close to zero for this tube. I ran it with just a tiny bit of positive grid current (about 0.1 milliamp) when working SSB. For CW or any mode not
/archives//html/Amps/2008-07/msg00199.html (10,365 bytes)

10. Re: [Amps] Bypass SWR RJ1As (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Sat, 17 Jan 2009 07:40:39 -0500
Hi Dave, Just as a data point, I'm using the silicone encapsulated version of the RJ1A (RJ1A-26N969) in my 50 MHz amp. I have about 1" of 1/4" wide thin (.003") brass strip connecting the relay NC co
/archives//html/Amps/2009-01/msg00138.html (7,555 bytes)

11. Re: [Amps] Pole Pigs (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Fri, 06 Feb 2009 11:03:08 -0500
True, unless you feel like doing surgical alterations. Everything is 13.2kV around here. In my early days I used 'local' pole pigs by stripping off much of the HV winding to get them down to ~3000VA
/archives//html/Amps/2009-02/msg00151.html (8,149 bytes)

12. Re: [Amps] Minimum Value of RF Plate Chokes (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Thu, 26 Feb 2009 12:34:41 -0500
Hi Eddy, To my way of thinking, we're not changing the computed (or optimum) values of components in the tank circuit, nor its Q, *if things are set up and tuned correctly*. I look at it this way: Pi
/archives//html/Amps/2009-02/msg00683.html (10,891 bytes)

13. Re: [Amps] Step-start; improved circuit. (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Sat, 07 Mar 2009 07:55:30 -0500
I have to agree whole heartedly. While many conventional step start circuits have worked flawlessly for years, even decades, I was never completely satisfied with any arrangement that had the relay v
/archives//html/Amps/2009-03/msg00226.html (8,124 bytes)

14. Re: [Amps] Step-start; improved circuit. (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Sun, 08 Mar 2009 07:31:53 -0400
I think I used an LM311 comparator and a PN2222A transistor because I have a lifetime supply of both and they were adequate for the application. I am now in the process of drafting schematics for all
/archives//html/Amps/2009-03/msg00240.html (8,290 bytes)

15. [Amps] Measuring meter pointer deflection (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Mon, 16 Mar 2009 09:09:10 -0400
I hope this is an appropriate question for the Amps list. I'm trying to design custom meter scales for my amplifiers. I downloaded the Meter program from Tonne Software which seems to work great. The
/archives//html/Amps/2009-03/msg00435.html (7,393 bytes)

16. Re: [Amps] Measuring meter pointer deflection (score: 1)
Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>
Date: Mon, 16 Mar 2009 11:30:29 -0400
Thanks Jim! (and Gerald, and others) Great software! Hmm. Most of these meters are Simpson, Triplett, and Modutec. I don't currently *think* they are 90 or 100 degrees, but... total incompetence on m
/archives//html/Amps/2009-03/msg00440.html (7,761 bytes)

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