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21. Re: [Amps] Alpha 87 Omega (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Mon, 27 Jun 2005 20:57:05 -0500
Tea, verily, Bob! I can see them on E-Bay now for $15,000 + . However, unlike the old Collins stuff, when Alpha finally elects to no longer support this model, it will be interesting to see how folks
/archives//html/Amps/2005-06/msg00268.html (7,873 bytes)

22. Re: [Amps] Grid Meter Confusion (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Wed, 29 Jun 2005 10:11:17 -0500
Hello, Mike, Are you running the tube grounded grid? If so, the grid pins on the tube socket all need to be strapped to chassis ground via short straps. To improve stability and kill some bad habits,
/archives//html/Amps/2005-06/msg00282.html (8,573 bytes)

23. Re: [Amps] New SGC Mini Lini Uses Class E Technology (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Sat, 2 Jul 2005 14:45:33 -0500
Who will be the first to buy 4 units, and toss them in a box with a combiner? That would give you legal-limit out, and weigh about 25 pounds. (((73))) Phil, K5PC Greetings, has anyone else seen the n
/archives//html/Amps/2005-07/msg00010.html (7,993 bytes)

24. Re: [Amps] Tetrodes (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Mon, 11 Jul 2005 10:29:23 -0500
What is "small"? 73, Dick Knol PA3DUV Tubes that do not have built-in handles are small; to me anyway..... (((73))) Phil, K5PC _______________________________________________ Amps mailing list Amps@c
/archives//html/Amps/2005-07/msg00084.html (7,229 bytes)

25. Re: [Amps] 572B heater voltage? (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Wed, 13 Jul 2005 17:44:00 -0500
6.3 volts @ 4.0 amps. (((73))) Phil, K5PC Anybody know what is the filament voltage/Amperes for 572B tube? Andy - VA3PL _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2005-07/msg00149.html (7,704 bytes)

26. Re: [Amps] 8877 Time Delay Query (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Thu, 28 Jul 2005 13:42:47 -0500
Another to add to the list; Alpha never bothered to delay HV on any of their 8877 amps. (((73))) Phil, K5PC Can anyone help with specific knowledge about the 3 minute time delay and the application o
/archives//html/Amps/2005-07/msg00343.html (9,316 bytes)

27. Re: [Amps] 8877 Time Delay Query (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Thu, 28 Jul 2005 16:15:08 -0500
No, Alphas with 8877's all have 3-minute timers. They won't key up until the time-out occurs. Others have already posted that the Eimac sheet on this tube says nothing about delaying HV application.
/archives//html/Amps/2005-07/msg00348.html (12,203 bytes)

28. Re: [Amps] surge limiter question (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Thu, 4 Aug 2005 15:50:38 -0500
in a filament filament) current flow. 120 ohms cold, Is a resistor not good enough for you? If the transformer is not huge in comparison to that needed, then it will limit the inrush current. A simp
/archives//html/Amps/2005-08/msg00119.html (7,813 bytes)

29. Re: [Amps] Plate choke resistance (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Sat, 6 Aug 2005 14:31:07 -0500
Sometimes builders use more than one RF choke and a vacuum relay to switch the additional choke into the circuit to arrive at enough inductance to prevent RF power from entering the power supply at l
/archives//html/Amps/2005-08/msg00216.html (7,978 bytes)

30. Re: [Amps] RF Parts OEM 3-500ZG's (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Mon, 8 Aug 2005 00:29:01 -0500
I just bought a used Ten-Tec Centurion on behalf of a friend. We both were under the mis-informed belief that it would be equipped with Eimac 3-500ZG's. Instead it has a matched pair of RF Parts bran
/archives//html/Amps/2005-08/msg00279.html (7,613 bytes)

31. [Amps] Attribution Marks (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Mon, 8 Aug 2005 00:52:20 -0500
It seems my attribution marks have been turned off. How do I get them back on? I'm using Microsoft Outlook. Thanks, Phil, K5PC _______________________________________________ Amps mailing list Amps@c
/archives//html/Amps/2005-08/msg00280.html (6,186 bytes)

32. Re: [Amps] 2 X 3-500Z's and Plate Voltage Choice (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Wed, 10 Aug 2005 09:08:41 -0500
What is needed is the anode current required for these big claims of QRO on the 500Z. This will give us an idea of how many tubes you are going through, and how often! (((73))) Phil, K5PC ___________
/archives//html/Amps/2005-08/msg00377.html (9,930 bytes)

33. Re: [Amps] Step-Starts (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Sat, 13 Aug 2005 16:04:02 -0500
If you have chosen the proper size contactors for the step-start and the step-start resistor(s) are robust enough, no damage will occur. The only damage will be to one's ego as the visitor's chortli
/archives//html/Amps/2005-08/msg00471.html (8,121 bytes)

34. Re: [Amps] Grid Current Advice (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Tue, 16 Aug 2005 02:32:10 -0500
Rich is correct, as usual. Something typical for a pair of 3-500Z's outputting 1700 watts or so would be 230 ma or so, or 115 ma per tube. (((73))) Phil, K5PC _______________________________________
/archives//html/Amps/2005-08/msg00546.html (7,844 bytes)

35. Re: [Amps] plate choke (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Fri, 26 Aug 2005 10:45:31 -0500
The measurements will only be valid if you make them with the choke in place in the amp. (((73))) Phil, K5PC _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2005-08/msg00696.html (9,107 bytes)

36. Re: [Amps] plate choke (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Fri, 26 Aug 2005 10:51:04 -0500
Harris uses ferrite rods in their chokes, ending up with a 1.8-30 mhz unit in a small package, with no resonances. This method was written up years ago in one of the ham mags., but I forget which. (
/archives//html/Amps/2005-08/msg00698.html (9,450 bytes)

37. Re: [Amps] plate choke (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Fri, 26 Aug 2005 15:49:10 -0500
Life was much simpler when we only built 5-band amps years ago. With the addition of the 160, 60, 30, 17, and 12 meter bands, the choke building business got more complicated. Chokes that worked gre
/archives//html/Amps/2005-08/msg00707.html (9,743 bytes)

38. Re: [Amps] Bias or Plate voltage change (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Wed, 31 Aug 2005 11:58:42 -0500
I think a lot of this goes back to the old days when power limitations posed by the FCC called for 1 kw input maximum on cw. I see no reason for switching HV anymore. Large commercial amps like the
/archives//html/Amps/2005-08/msg00780.html (8,494 bytes)

39. Re: [Amps] CW and High Voltage (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Sat, 3 Sep 2005 14:01:45 -0500
This is never done under any circumstances on any mode! This is correct for all modes. Because the tank circuit is designed to operate at only one impedance transformation and Q, and it is usually d
/archives//html/Amps/2005-09/msg00024.html (8,734 bytes)

40. Re: [Amps] CW and High Voltage (score: 1)
Author: "Phil Clements" <philc@texascellnet.com>
Date: Sun, 4 Sep 2005 00:53:35 -0500
If you need to cut the drive back far enough to make re-tuning necessary, why not just turn the thing off! People usually use amplifiers because they want to increase the quality of their signal for
/archives//html/Amps/2005-09/msg00032.html (9,058 bytes)

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