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1. Re: [Amps] {Collins} 30S-1 (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 21 Oct 2009 10:57:29 -0400
The 4CX1500A requires 5V at almost 40 amps filament supply!!!! 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
/archives//html/Amps/2009-10/msg00286.html (8,529 bytes)

2. Re: [Amps] Silver Plating Tank Coil ?? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 22 Sep 2009 09:36:09 -0400
Gold plating is often done over nickel. Apparently the copper atoms tend to diffuse thru the thin gold layer. To stop this a plating of much less porous nickel is used as an interface layer between t
/archives//html/Amps/2009-09/msg00259.html (9,626 bytes)

3. Re: [Amps] Amplifier scenario question (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 17 Sep 2009 08:54:29 -0400
Besides being bad you should notice the sudden increase of SWR between your TX and AMP Perhaps a nice thing to have would be a SWR limit detector of some sort to quickly switch the bypass relays so t
/archives//html/Amps/2009-09/msg00229.html (7,869 bytes)

4. Re: [Amps] 3-500z Silly question (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Thu, 3 Sep 2009 23:39:46 -0400
By the way I was referring to glass (radiation cooled) tubes since you were talking about 3-500z's. Forces air or water cooled tubes are a different matter and the lopsided power dissipation on those
/archives//html/Amps/2009-09/msg00032.html (10,538 bytes)

5. Re: [Amps] 3-500z Silly question (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Thu, 3 Sep 2009 23:26:50 -0400
Yes and no. The filament would emit more on the side that is most negative with respect to the grid than the side that is most positive respect to the grid. However, this would mostly be noticed at i
/archives//html/Amps/2009-09/msg00031.html (9,833 bytes)

6. Re: [Amps] RF parts and parasitics!! (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Wed, 26 Aug 2009 22:04:34 -0400
He is doing an analysis of the circuit. Particularly the transfer function between the plate and the grid. To do this you have to look at the internal impedances of the tube itself. There is capacita
/archives//html/Amps/2009-08/msg00529.html (10,783 bytes)

7. Re: [Amps] GG amplifier input impedance (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 26 Aug 2009 15:23:58 -0400
Some of you are getting confused between the difference of the the impedance between the elements of the TUBE and the impedance of the complete circuit. He is referring to the grid to cathode impedan
/archives//html/Amps/2009-08/msg00510.html (9,795 bytes)

8. Re: [Amps] RF parts and parasitics!! (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 26 Aug 2009 14:50:01 -0400
Grid to Cathode impedance of a tube is the grid to cathode voltage divided by the grid current!!! 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2009-08/msg00506.html (13,620 bytes)

9. Re: [Amps] QEX Article on EER (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Sat, 22 Aug 2009 16:26:58 -0400
This prototype is a static experimental system that does not have active amplitude modulation. He also mentions the problems using his system with SSB at the end of the article. I think there are sti
/archives//html/Amps/2009-08/msg00389.html (8,060 bytes)

10. Re: [Amps] SGC-Mini Lini (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 10 Aug 2009 00:40:07 -0400
Well, I think the contact problem was the least of their worries. I suspect the is a fundamental problem with the product which I don't believe they ever overcame. To accurately reproduce a ssb signa
/archives//html/Amps/2009-08/msg00192.html (10,115 bytes)

11. [Amps] SGC-Mini Lini (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Sun, 9 Aug 2009 22:21:44 -0400
Does anyone out there actually own a Mini Lini? 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-08/msg00189.html (6,744 bytes)

12. Re: [Amps] grounding grids (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 3 Aug 2009 05:22:47 -0400
If I recall correctly there was an article in QST in the 60's of an amplifier using a pair of 4x150A tubes with both grids grounded but the output power was limited by the drive. About 2 issues later
/archives//html/Amps/2009-08/msg00048.html (9,328 bytes)

13. Re: [Amps] grounding grids (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Sun, 2 Aug 2009 12:13:05 -0400
It is very helpful to question what has been done in the past so we can learn from it. Making real measurements helps also. I did not see the details of your experiment but comparison with directly g
/archives//html/Amps/2009-08/msg00024.html (10,548 bytes)

14. Re: [Amps] grounding grids (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Sun, 2 Aug 2009 00:24:21 -0400
The question we should ask now what are our preferences in grounding grids. Mine is as direct to ground as possible with the least series impedance. 73 Bill wa4lav PS Has the gentleman trying out the
/archives//html/Amps/2009-08/msg00019.html (8,223 bytes)

15. Re: [Amps] grounding grids (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 30 Jul 2009 11:28:38 -0400
My previous message applied to the negative feedback in a grounded grid amplifier due to the cathode and drive impedances.Similar to the negative feedback due to an un-bypassed emitter resistor in a
/archives//html/Amps/2009-07/msg00404.html (9,363 bytes)

16. Re: [Amps] [Spam] Re: grounding grids (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Thu, 30 Jul 2009 00:48:32 -0400
Sorry, Looking back thru the thread I see that has been suggested. Just now checking my email for the evening. 73 Bill wa4lav Perhaps resistors or inductors are sacrificial components to protect the
/archives//html/Amps/2009-07/msg00400.html (21,389 bytes)

17. Re: [Amps] [Spam] Re: grounding grids (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Thu, 30 Jul 2009 00:42:09 -0400
Perhaps resistors or inductors are sacrificial components to protect the control grid in case the tube arcs over. I seem to recall placing EIMAC suggest placing a resistor in series with the HV to th
/archives//html/Amps/2009-07/msg00391.html (20,398 bytes)

18. Re: [Amps] grounding grids (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Thu, 30 Jul 2009 00:28:36 -0400
Let see. RF plate voltage is proportional to RF plate current,,,,RF cathode current is proportional to plate current....RF voltage across the cathode drive impedance is proportional to RF cathode cur
/archives//html/Amps/2009-07/msg00390.html (11,753 bytes)

19. Re: [Amps] grounding grids (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 29 Jul 2009 09:28:05 -0400
Maybe to measure individual grid currents? That would be the only reason I can think of. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://li
/archives//html/Amps/2009-07/msg00350.html (7,833 bytes)

20. Re: [Amps] 4x813`s in GG (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 27 Jul 2009 16:18:54 -0400
A good example of running tubes over the published Plate voltage limits is the E.F. Johnson Viking 500 plate modulated AM transmitter. The final tube 4-400 and the modulator tubes 811A's were run wit
/archives//html/Amps/2009-07/msg00341.html (7,840 bytes)

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