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21. Re: [Amps] Stock up on tubes? (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Mon, 5 Dec 2016 19:25:33 -0800; No. The SB-220 power transformer is the weak link in that amp. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2016-12/msg00112.html (9,493 bytes)
22. Re: [Amps] Stock up on tubes? (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Mon, 5 Dec 2016 19:47:29 -0800; Sounds like you would really be using the parts from the old amp to build a new amp. That's no longer a "modification" once the changes snowball. _______________________________________________ Amps; /archives//html/Amps/2016-12/msg00114.html (9,447 bytes)
23. Re: [Amps] Stock up on tubes? (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Mon, 5 Dec 2016 19:51:37 -0800; I think $1,000 for a commercial amp based on this tech is way optimistic. We'll see once someone introduces it, or something similar. Cathy N5WVR _______________________________________________ Amps; /archives//html/Amps/2016-12/msg00116.html (8,548 bytes)
24. [Amps] Stock up on tubes? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 5 Dec 2016 20:05:16 -0800; REPLY: In terms of the device itself, that day is already here. The LDMOS devices from NXP are fully capable of replacing tubes in a legal limit amp and the price already beats tubes too. A pair of t; /archives//html/Amps/2016-12/msg00117.html (10,117 bytes)
25. Re: [Amps] Stock up on tubes? (score: 1): Author: "Ken Durand" <N4zed@comcast.net>; Date: Tue, 6 Dec 2016 04:14:35 -0500; Ampleon has added a new LDMOS power transistor to its family of extremely rugged power transistors designed specifically for use in high power amplifiers operating in the 10 to 500 MHz. Suiting use i; /archives//html/Amps/2016-12/msg00121.html (11,614 bytes)
26. [Amps] Stock up on tubes? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 6 Dec 2016 04:02:19 -0800; Good answers. Question on #2 below: Is the power transformer in the SB-220 conservatively rated, as the one in the SB-200 is? Some hams have replaced the 572-Bs with GI-7BTs, and the SB-200's transfo; /archives//html/Amps/2016-12/msg00123.html (9,120 bytes)
27. Re: [Amps] Stock up on tubes? (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 6 Dec 2016 12:55:05 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Really? I can see retuning the input and the mechanical issues, but why would one need to change the bandswitch and other stuff mentioned above? Assuming; /archives//html/Amps/2016-12/msg00126.html (8,868 bytes)
28. [Amps] Stock up on tubes? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 6 Dec 2016 05:59:41 -0800; I think $1,000 for a commercial SS amp based on this tech is way optimistic. We'll see once someone introduces it, or something similar. Cathy N5WVR freq, and only requires one fixed LP filter... and; /archives//html/Amps/2016-12/msg00129.html (9,356 bytes)
29. Re: [Amps] Stock up on tubes? (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Tue, 6 Dec 2016 14:26:03 +0000 (UTC); Is that VSWR of 65:1 key-down transmit at 1,700 watts, without any pulsing? So if I accidentally transmit normal hand-sent slow CW into a bad antenna mismatch, no damage will occur? I've gotten reall; /archives//html/Amps/2016-12/msg00130.html (13,368 bytes)
30. Re: [Amps] Stock up on tubes? (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Tue, 6 Dec 2016 07:33:04 -0700; There was a YouTube video showing the output of the amp, running ~ 1KW, being shorted with a big screwdriver. Lots of sparks, but no damage to the device. I think they can put some form of VSWR prote; /archives//html/Amps/2016-12/msg00131.html (14,832 bytes)
31. Re: [Amps] Stock up on tubes? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 6 Dec 2016 10:21:37 -0500; For those of you who have not yet seen this video, it shows some remarkable cooling progress being made to SS amplifiers. I hope that in the near future, we'll see more SS amplifiers using closed-loo; /archives//html/Amps/2016-12/msg00134.html (13,447 bytes)
32. Re: [Amps] Stock up on tubes? (score: 1): Author: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>; Date: Tue, 6 Dec 2016 16:40:41 +0100; Den 06-12-2016 kl. 16:01 skrev Peter Frenning [OZ1PIF]: Den 06-12-2016 kl. 15:26 skrev Catherine James: Is that VSWR of 65:1 key-down transmit at 1,700 watts, without any pulsing? So if I accidentall; /archives//html/Amps/2016-12/msg00135.html (10,124 bytes)
33. Re: [Amps] Stock up on tubes? (score: 1): Author: <w8hw@comcast.net>; Date: Tue, 6 Dec 2016 10:44:31 -0500; Every one is talking about Obsolescence of tubes. The problem is the other way around. The truth of the mater Solid State finals often stop being produced in around 18 months. After that you can get; /archives//html/Amps/2016-12/msg00138.html (10,452 bytes)
34. Re: [Amps] Stock up on tubes? (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Tue, 6 Dec 2016 15:59:19 +0000; On a related note... USA manufactures are required to offer replacement parts for many years (7 years I think), while other countries (in MOST cases) do not have that requirement. Only in California.; /archives//html/Amps/2016-12/msg00139.html (8,850 bytes)
35. Re: [Amps] Stock up on tubes? (score: 1): Author: Larry Dighera <LDighera@att.net>; Date: Wed, 07 Dec 2016 03:18:31 -0800; Data sheet is available on this page: https://www.rfparts.com/rftransistors/transistors-blf/blf188xr-nxp.html _______________________________________________ Amps mailing list Amps@contesting.com htt; /archives//html/Amps/2016-12/msg00158.html (9,787 bytes)
36. [Amps] Stock up on tubes? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 7 Dec 2016 06:01:33 -0800; For those of you who have not yet seen this video, it shows some remarkable cooling progress being made to SS amplifiers. I hope that in the near future, we'll see more SS amplifiers using closed-loo; /archives//html/Amps/2016-12/msg00160.html (8,807 bytes)

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