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1. [Amps] GS-35b fully-submersed oil cooling (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Sun, 15 Mar 2015 12:17:21 +1300
Greetings gurus! Any comments on the proposition of completely submersing a GS-35b (with stock cooler attached) in a cooling bath of dry transformer oil? Considerations: Basically, I have no interest
/archives//html/Amps/2015-03/msg00028.html (7,540 bytes)

2. Re: [Amps] GS-35b fully-submersed oil cooling (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Wed, 18 Mar 2015 07:58:40 +1300
Many thanks for your engagement. mechanical, non-RF side [...] another time. Thank you. We'll get to that after we establish it is a viable proposition RF-wise. Basically, I think oil cooling of some
/archives//html/Amps/2015-03/msg00037.html (10,333 bytes)

3. Re: [Amps] GS-35b fully-submersed oil cooling (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Sat, 21 Mar 2015 07:45:30 +1300
On 21/03/15 05:00, properly designed system would have a sump where the water would naturally separate from the oil, and a valve to drain the small amounts of water collected over time. No. A properl
/archives//html/Amps/2015-03/msg00052.html (10,386 bytes)

4. [Amps] more - oil bath GS-35b (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Mon, 30 Mar 2015 11:59:53 +1300
Gurus, I am persuaded the RF situation (of a completely enclosed tubeset) is feasible. I see that the ceramic body of the GS-35b must have some sort of cooling as well, so I figured O-ring the grid-r
/archives//html/Amps/2015-03/msg00076.html (8,798 bytes)

5. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Mon, 30 Mar 2015 17:20:50 +1300
Correct! The faster the oil flow in the tube cooler, the better the cooling. But not so for the radiator. The oil must slow down and be in the radiator for a finite time for the heat to be transferre
/archives//html/Amps/2015-03/msg00078.html (8,828 bytes)

6. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Thu, 02 Apr 2015 08:13:41 +1300
Thanks greatly Chris for your additions there. It would have been a lot of work for me to make clear examples like that, but you see them regularly so can comment concisely. Most of my lessons learne
/archives//html/Amps/2015-04/msg00013.html (12,182 bytes)

7. [Amps] Cathode Cooling - oil bath GS-35b (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Thu, 02 Apr 2015 08:46:09 +1300
Many good comments from all regarding cooling, and I think we've nailed it down pretty damn good! I will publish what I build, as it its pretty much a community effort. I am concerned about the catho
/archives//html/Amps/2015-04/msg00015.html (8,357 bytes)

8. [Amps] Filament overcooling - oil bath GS-35b (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Thu, 02 Apr 2015 10:35:50 +1300
Any comments on overcooling of the filaments, to the point where the tube may be harmed? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2015-04/msg00020.html (6,392 bytes)

9. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Thu, 02 Apr 2015 12:54:07 +1300
On 02/04/15 10:05, amps-request@contesting.com wrote: Once the system has reached equilibrium the radiator is doing all it can with a given air flow. No, I do not want the cooling system running at m
/archives//html/Amps/2015-04/msg00022.html (12,915 bytes)

10. Re: [Amps] silver mica source (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Thu, 02 Apr 2015 14:07:22 +1300
Polyethylene is pretty good too. Freezer bags! Better than mica. Google search "picatune capacitors" _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2015-04/msg00024.html (7,431 bytes)

11. Re: [Amps] Amps Digest, Vol 148, Issue 10 (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Tue, 07 Apr 2015 07:31:40 +1200
On 07/04/15 04:00, "Jim Thomson" <jim.thom@telus.net> wrote: [....] With the correct flow rate into a GS35B, oil temps should not be an issue, provided that a correct size rad is used, along with an
/archives//html/Amps/2015-04/msg00046.html (7,658 bytes)

12. Re: [Amps] oil cooling.. (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Tue, 07 Apr 2015 07:33:48 +1200
On 07/04/15 04:00, "Jim Thomson" <jim.thom@telus.net> wrote: [....] With the correct flow rate into a GS35B, oil temps should not be an issue, provided that a correct size rad is used, along with an
/archives//html/Amps/2015-04/msg00047.html (7,209 bytes)

13. [Amps] Which 2.5kw dissipation tetrode? (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Wed, 8 Apr 2015 17:09:45 +1200
Okies, Would gurus like to put a shout out for their favorite 2-3kw plate dissipation tetrode? It seems gu-84 is like rocking horse shit. Cheers _______________________________________________ Amps m
/archives//html/Amps/2015-04/msg00050.html (7,236 bytes)

14. [Amps] fully-submersed oil cooling - (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Sat, 11 Apr 2015 06:53:35 +1200
Hello David, Many thanks for your engagement. It seems the extra capacitance in question is relative to the metal surround of the tubes, and not relevant in (near) free space. My suggestion is, the b
/archives//html/Amps/2015-04/msg00059.html (9,098 bytes)

15. Re: [Amps] Amps Digest, Vol 148, Issue 15 (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Mon, 13 Apr 2015 07:46:17 +1200
The cooling will be worse than air cooling, not better, as the ceramic and other parts of the tube have no cooling at all, unless I add a fan, which I dont want to do. I want a fully integrated low-m
/archives//html/Amps/2015-04/msg00086.html (7,110 bytes)

16. Re: [Amps] oil vs distilled water cooling. (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Fri, 17 Apr 2015 07:09:58 +1200
Um. Why. Not. Just. Use. Oil. And be done with all those problems ?? Because the oil is flammable? Is that the only reason? How many of your water cooled amps leak AT ALL? If they didn't leak water,
/archives//html/Amps/2015-04/msg00116.html (9,379 bytes)

17. Re: [Amps] oil vs distilled water cooling (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Sat, 18 Apr 2015 08:27:46 +1200
I started replying, before I realised this was a troll! Very well done, and you had me for a second until I re-read your last sentence a few times! Point taken as well, that the water thing has been
/archives//html/Amps/2015-04/msg00120.html (9,369 bytes)

18. Re: [Amps] Amps Digest, Vol 148, Issue 25 (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Mon, 20 Apr 2015 07:13:41 +1200
Apologies! It's always difficult trying to get that right manually! Cheers! Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2015-04/msg00127.html (6,557 bytes)

19. [Amps] Tetrode calcs (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Mon, 27 Apr 2015 10:02:14 +1200
How do I calculate G2 voltage from the Anode voltage? Tube is 4-400a. Class AB2. The design calls for Va of 3200V, but I only have 2500V so I will just go with that. Design EG2 is 600V, but that will
/archives//html/Amps/2015-04/msg00167.html (6,314 bytes)

20. Re: [Amps] Tetrode calcs (score: 1)
Author: Steve Wright <stevewrightnz@gmail.com>
Date: Wed, 29 Apr 2015 07:33:51 +1200
Thanks Manfred, that's very clear! Ok. I see. With your spreadsheet, I built a transformer to do filament, sg1, and tapped sg2, and that worked real well. Flux density is a little high at 1.4 so it w
/archives//html/Amps/2015-04/msg00176.html (8,145 bytes)

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