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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Need\s+Smarter\s+Than\s+I\s+Am\s+Help\.\s*$/: 12 ]

Total 12 documents matching your query.

1. [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Joe <nss@mwt.net>
Date: Fri, 8 Oct 2021 10:10:35 -0500
As many of you here know, I have been making some MAJOR changes to this Heathkit SB-220 amp. Many here, and many other places, have helped me both on these E-Mail lists as well as directly. I am extr
/archives//html/Amps/2021-10/msg00000.html (11,649 bytes)

2. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 8 Oct 2021 11:45:18 -0400
<http://www.arrl.org/files/file/QEX_Next_Issue/2015/Sep-Oct_2015/Kaune.pdf> 73, ... Joe, W4TV Many here, and many other places, have helped me both on these E-Mail lists as well as directly. I am ext
/archives//html/Amps/2021-10/msg00001.html (12,848 bytes)

3. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Kim Elmore <cw_de_n5op@sbcglobal.net>
Date: Sun, 10 Oct 2021 12:10:16 -0500
I did this once on a single-tube 3-500Z amp (an AL-80A) and raised the B+ about the same amount. A few back-of-the-envelope calculations showed that I needed more L in the tank circuit. It used a Pi-
/archives//html/Amps/2021-10/msg00007.html (8,661 bytes)

4. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 11 Oct 2021 04:49:48 -0500
Why do some of you guys want to jack up the plate v. on your 3-500s? The power difference won't be noticed and you'll create a cascade of problems. You still have the same plate dissipation and plate
/archives//html/Amps/2021-10/msg00025.html (7,669 bytes)

5. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Adrian <vk4tux@gmail.com>
Date: Mon, 11 Oct 2021 19:56:14 +1000
i see sense in your comments here Rob, but am curious on why the IMD spec would be worse ? Apart from correct biasing and build quality, I was always under the impression that more voltage and less c
/archives//html/Amps/2021-10/msg00026.html (8,513 bytes)

6. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 11 Oct 2021 05:05:53 -0500
It's tube type dependent. Not all tubes work the same way. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
/archives//html/Amps/2021-10/msg00028.html (7,913 bytes)

7. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Kim Elmore <cw_de_n5op@sbcglobal.net>
Date: Sun, 10 Oct 2021 11:24:11 -0500
I did this once on a single-tube 3-500Z amp (an AL-80A) and raised the B+ about the same amount. A few back-of-the-envelope calculations showed that I needed more L in the tank circuit. It used a Pi-
/archives//html/Amps/2021-10/msg00029.html (15,806 bytes)

8. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 11 Oct 2021 09:33:56 -0500
This IS a valid question. I am not sure about others, In my case it was 90% Cost. With side effect benefits. I knew that for high duty cycle modes you should run this amp at reduced power. I was usin
/archives//html/Amps/2021-10/msg00032.html (12,416 bytes)

9. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: gudguyham via Amps <amps@contesting.com>
Date: Mon, 11 Oct 2021 15:26:21 +0000 (UTC)
As far as Q, most ARRL handbooks have charts based on plate impedance and show C1 L C2 values for a Q of around 10-12.  Look at the chart that fits your plate impedance.  Set C1 and C2 to the values
/archives//html/Amps/2021-10/msg00033.html (13,425 bytes)

10. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 11 Oct 2021 11:54:03 -0500
Thanks for the lead! Now can anyone scan those page(s) and e mail them to me? I do not have access to any of the Handbooks.  I had the CD version, but can not seem to find it. Joe WB9SBD On 10/11/202
/archives//html/Amps/2021-10/msg00034.html (15,270 bytes)

11. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: "Bob D." <ajamas.rn@gmail.com>
Date: Mon, 11 Oct 2021 12:54:06 -0400
Is IMD higher at higher plate voltage? From the 73 Eimac data sheet, for AB2, it's worse at 2.5kV than at 1.5 or 3.5. Then there's context. CW? For an amp originally designed for 1kW/2kW CW/SSB input
/archives//html/Amps/2021-10/msg00035.html (9,843 bytes)

12. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Mon, 11 Oct 2021 19:36:53 -0500
I'm wondering the exact same thing Bob! I just shake my head... 73, Jim W7RY On 10/11/2021 4:49 AM, Rob Atkinson wrote: Why do some of you guys want to jack up the plate v. on your 3-500s? The power
/archives//html/Amps/2021-10/msg00044.html (8,740 bytes)

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