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1. Re: [Amps] Tank circuit Q (score: 1)
Author: "Mike Saculla" <fqm@msn.com>
Date: Thu, 19 Apr 2007 15:12:58 -0700
The tank coils of real big transmitters are often water cooled! When you already have the water circuit to cool the tubes, it's not that much more effort. I guess you would need some coiled water hos
/archives//html/Amps/2007-04/msg00210.html (8,176 bytes)

2. [Amps] Ion Pumps (score: 1)
Author: "Mike Saculla" <fqm@msn.com>
Date: Wed, 25 Apr 2007 16:17:36 -0700
Ion pumps only work on existing vacuum, i.e., you cannot pump down a vacuum chamber or bottle from atmosphere with an ion pump alone. When a chamber is evacuated, there is always some residual gas re
/archives//html/Amps/2007-04/msg00300.html (8,340 bytes)

3. Re: [Amps] Ion Pumps (score: 1)
Author: "Mike Saculla" <fqm@msn.com>
Date: Wed, 25 Apr 2007 19:29:57 -0700
Hi Tom, 10 to -6 or -7 sounds right to me. That would be easy enough to achieve in a vacuum tube. When I overheard the 70 Torr bit, the guy was reading from something, don't remember what... it was t
/archives//html/Amps/2007-04/msg00306.html (8,927 bytes)

4. Re: [Amps] Amps Digest, Vol 63, Issue 56 (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Mon, 31 Mar 2008 14:25:24 -0700
My footswitch is made by Heil (I believe). It has two separate leads for PTT keying: one for the rig and one for the amp. The amp is keyed first, then the rig, to avoid hot switching. Seems like a go
/archives//html/Amps/2008-03/msg00391.html (6,901 bytes)

5. Re: [Amps] Amps Digest, Vol 64, Issue 29 (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Fri, 18 Apr 2008 09:06:04 -0700
This presents an interesting question. When working under the hood of your car, it is recommended you disconnect the negative lead to the battery for safety. Why the negative lead? When you disconnec
/archives//html/Amps/2008-04/msg00240.html (8,010 bytes)

6. [Amps] Power supply question (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Sat, 11 Apr 2009 13:28:53 -0700
With your basic FWD circuit essentially 2 capacitors, or 2 banks of capacitors, get alternately charged by a single transformer by 2 diode strings. The entire cap banks is then charged at a rate of 6
/archives//html/Amps/2009-04/msg00131.html (7,271 bytes)

7. Re: [Amps] Power Supply Question (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Tue, 14 Apr 2009 19:28:12 -0700
Thanks to all who responded to this thread. Though this scheme does work, it doesn't produce the same results. I didn't do the math the first time around. My two xfmrs are 1100 VAC. If I series the s
/archives//html/Amps/2009-04/msg00153.html (7,900 bytes)

8. Re: [Amps] Power Supply Question (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Thu, 16 Apr 2009 18:43:55 -0700
Thanks Bill, maybe Rex's idea is the way to go. Diodes are cheap and his idea would only require 2 more strings. Each xfmr should then only see half of the total voltage. Mike K6MDS -- ...Or you coul
/archives//html/Amps/2009-04/msg00161.html (8,012 bytes)

9. Re: [Amps] Solid state relays and step start (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Thu, 4 Mar 2010 21:40:23 -0800
When solid state relays fail, they fail in the shorted condition. One of their downfalls. Mike K6MDS Has anyone had problems using a solid state relay to short out the step start resistor in a power
/archives//html/Amps/2010-03/msg00089.html (8,524 bytes)

10. Re: [Amps] Solid state relays and step start (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Fri, 5 Mar 2010 18:55:51 -0800
Roger, your last line tells the story. If it fails shorted, it should be obvious by the fact that the equipment won't shut off. But a failure at some resistance would certainly set up a potential dan
/archives//html/Amps/2010-03/msg00103.html (11,039 bytes)

11. Re: [Amps] Size of Parasitic Chokes (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Thu, 15 Jul 2010 21:07:46 -0700
I see 3CX3000A7 amps with no suppressor at all. How stable have any of you found this tube to be? Anyone have one take off on them with no suppressor? Or should I include one just to be safe? Mike K6
/archives//html/Amps/2010-07/msg00145.html (8,243 bytes)

12. Re: [Amps] Salt water dummy loads ? (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Sat, 17 Jul 2010 12:24:38 -0700
This is how you make the unbalanced version. The balanced version uses two wires. HIHI. Mike K6MDS can... then just ONE probe, dead center, coming straight down from the hot side of the coax connecto
/archives//html/Amps/2010-07/msg00198.html (6,582 bytes)

13. Re: [Amps] Amps Digest, Vol 94, Issue 60 (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Sat, 30 Oct 2010 16:38:37 -0700
At first I was suspicious of the 600ma Ip too. But if the amp is being pulsed tuned, the wattmeter on top might be reading peak power and the amp's analog meter reading average power. Note that the a
/archives//html/Amps/2010-10/msg00446.html (7,578 bytes)

14. Re: [Amps] HV rectifier strings - to bypass or not? (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Sun, 31 Oct 2010 14:32:59 -0700
Check e-bay. I bought a bunch of 4700pf 10kV disc for a good price a few months ago. Mike K6MDS Hi Carl, Sounds like a good suggestion. I went looking for suitable HV capacitors in the Mouser, DigiKe
/archives//html/Amps/2010-10/msg00492.html (9,031 bytes)

15. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Wed, 10 Nov 2010 22:24:55 -0800
"When amps are outlawed, only outlaws will have amps" Mike K6MDS --Forwarded Message Attachment-- To: amps@contesting.com More rules and laws. Just what we need in our hobby. They'll be as effective
/archives//html/Amps/2010-11/msg00152.html (8,447 bytes)

16. [Amps] brass or BNP hardware (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Mon, 22 Nov 2010 22:35:05 -0800
Date: Fri, 19 Nov 2010 13:36:22 -0700 From: "John Lyles" <jtml@losalamos.com> Subject: [Amps] brass or BNP hardware In RF power amplifiers, HF to VHF range, I have used brass or nonmagnetic stainless
/archives//html/Amps/2010-11/msg00385.html (11,298 bytes)

17. Re: [Amps] Fan for SB220 (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Sat, 18 Dec 2010 17:01:27 -0800
The point that Rich is making on his site is anything shiny can reflect radiated heat back to the tubes. The tubes are the source of heat. Some of this heat is conducted to the elements of the tube.
/archives//html/Amps/2010-12/msg00216.html (9,766 bytes)

18. Re: [Amps] Black Heat Shields (score: 1)
Author: Mike Saculla <fqm@msn.com>
Date: Sun, 19 Dec 2010 21:20:18 -0800
If any of you discover a material that absorbs heat faster than it radiates it, please let me know. We can become millionaires together. Conservation of energy in the universe - materials absorb and
/archives//html/Amps/2010-12/msg00275.html (10,938 bytes)

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