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21. Re: [Amps] PowerGenius XL Video (score: 1)
Author: Kevin <kstover@ac0h.net>
Date: Sat, 11 Feb 2017 10:51:54 -0600
All day, key down, maximum smoke? I doubt it. That seems to be the new standard around here. Any amplifier topology that can't meet that ridiculous standard isn't worthy. Oh, don't forget the 20:1 ma
/archives//html/Amps/2017-02/msg00045.html (11,053 bytes)

22. Re: [Amps] PowerGenius XL Video (score: 1)
Author: Kevin <kstover@ac0h.net>
Date: Sat, 11 Feb 2017 11:06:28 -0600
Jim brings up a good point that didn't cross my work addled mind last night. On 10m FM you aren't going to get 60+% efficiency. Add to that 1500W continuous carrier on FM for lets say an hour? The Pi
/archives//html/Amps/2017-02/msg00046.html (11,915 bytes)

23. Re: [Amps] Maintenance-free (score: 1)
Author: Kevin <kstover@ac0h.net>
Date: Mon, 27 Feb 2017 20:03:57 -0600
As a teen-ager and early-twenty-something, I changed the oil in my car. It was easy. You either popped the hood or crawled under the car (depending on the model), used a tool to break the oil filter
/archives//html/Amps/2017-02/msg00218.html (11,114 bytes)

24. Re: [Amps] SS amps watercooling - was PowerGenius XL (score: 1)
Author: Kevin <kstover@ac0h.net>
Date: Mon, 6 Mar 2017 17:02:29 -0600
Propylene Glycol. It's cheaper than Ethylene Glycol (Car anti-freeze), is non-toxic with rust and algae inhibitors. All anti-freeze lowers the freezing point of the water it is mixed with. It also ra
/archives//html/Amps/2017-03/msg00059.html (16,094 bytes)

25. Re: [Amps] Price per Watt Conversation (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Sun, 23 Apr 2017 09:15:01 -0500
Agree, I'd use the phrase "de-rated" like they do in aircraft engines. Aircraft engines are rated for a certain horse power or thrust at sea level. An engine thermally rated for 900 HP might only mak
/archives//html/Amps/2017-04/msg00214.html (12,730 bytes)

26. Re: [Amps] HV MOSFETs for RF (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Wed, 10 May 2017 19:01:40 -0500
All, IMHO the problem with today's 100W radios is that they are designed for 12V finals. Comparing a "modern" solid state radio designed to run on 12V finals to a Collins 32S-3 is borderline ridiculo
/archives//html/Amps/2017-05/msg00108.html (11,024 bytes)

27. Re: [Amps] new amp race (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Sun, 21 May 2017 11:07:57 -0500
And they're doing it with V-6's. Ford Eco-Boost V6 will make 365hp. Of course it's twin turbo's make that possible. My 1969 Chevy El Camino SS with a 396 big block would make 375. The goal used to be
/archives//html/Amps/2017-05/msg00208.html (9,806 bytes)

28. Re: [Amps] RF2K+ LDMOS linear (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Sun, 4 Jun 2017 11:20:14 -0500
Then big gun contest stations will be the only ones using tube amps. Market gets smaller, prices go up, the fat lady starts tuning up. You're out numbered. On 6/4/2017 8:58 AM, Steve London wrote: I
/archives//html/Amps/2017-06/msg00016.html (12,250 bytes)

29. Re: [Amps] RF2K+ LDMOS linear (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Sun, 4 Jun 2017 18:22:03 -0500
All fine and good but where on God's green earth did you get $8K? The SPE 2K is $8K but were not talking about that amp (^^^subject line^^^). We're talking about the German amp kit which sells for a
/archives//html/Amps/2017-06/msg00027.html (12,781 bytes)

30. Re: [Amps] LDMOS availability (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Tue, 6 Jun 2017 17:16:06 -0500
OK, name some 1400W solid state devices and they're first date of manufacture. Seems to me they didn't exist until a few years ago. You don't like solid state....we get it. People didn't like cars an
/archives//html/Amps/2017-06/msg00098.html (16,045 bytes)

31. Re: [Amps] Pole pigs removed from oil ?? (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Sat, 4 Nov 2017 10:35:01 -0500
I'm a little concerned about people just dumping the oil. Transformer oil is a famous source of PCB's. How old does a pole pig have to be before you can safely say there are no PCB's in the oil? I us
/archives//html/Amps/2017-11/msg00013.html (10,009 bytes)

32. Re: [Amps] Amplifier for 630 meter band (score: 1)
Author: "Kevin Stover, AC0H" <kstover@ac0h.net>
Date: Fri, 10 Nov 2017 17:04:31 -0600
Convert a 100W Marshall head to 630m? ;-) I've seen observations that some audio power amplifier can be made to work by removing any circuitry to limit their bandwidth. Audio amplifiers generally hav
/archives//html/Amps/2017-11/msg00109.html (10,011 bytes)

33. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: <kstover@ac0h.net>
Date: Sun, 24 Dec 2017 20:09:57 -0600
What happens when they quit making tubes? I can think of one company making a CCS rated tube final amp (Alpha) and they are hanging on by a thumb nail with their $6K amplifier. The 9500 won't do CCS
/archives//html/Amps/2017-12/msg00145.html (11,664 bytes)

34. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: <kstover@ac0h.net>
Date: Mon, 25 Dec 2017 09:02:19 -0600
I did not even bother with eBay as no manufacturer will source parts from e-Bay. I did find an 3CX1500A7 on eBay for $1775. 10 people are actually watching it. If I'm buying a new amplifier for $8K (
/archives//html/Amps/2017-12/msg00153.html (14,443 bytes)

35. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: <kstover@ac0h.net>
Date: Mon, 25 Dec 2017 13:06:08 -0600
Patrick, I did not include OM Power or Acom because neither of them make and amp with the 3CX1500A7. They use the afore mentioned dirty, evil, Russian or Chinese tetrodes. If I'm not mistaken Acom's
/archives//html/Amps/2017-12/msg00158.html (16,057 bytes)

36. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1)
Author: <kstover@ac0h.net>
Date: Mon, 25 Dec 2017 13:16:56 -0600
I don't "know" that for sure but can't imagine Elecraft taking a step backward from the excellent KAT500. I'm betting they used the KAT500 as a starting point for the tuner in the KPA1500. How do you
/archives//html/Amps/2017-12/msg00159.html (9,880 bytes)

37. Re: [Amps] Defining CCS (score: 1)
Author: <kstover@ac0h.net>
Date: Sun, 31 Dec 2017 10:45:00 -0600
This was my understanding as well. By those definitions there is no such thing as a "CCS" amateur amp. "No Time Limit" is just marketing fluff. Ok, I have had it with vague sales statements. The foll
/archives//html/Amps/2017-12/msg00196.html (7,986 bytes)

38. Re: [Amps] Defining CCS (score: 1)
Author: <kstover@ac0h.net>
Date: Sun, 31 Dec 2017 14:27:14 -0600
There is a difference between running 100% duty cycle modes like RTTY and FM key down for 50 minutes then 10 minutes off, 83.3% duty cycle for an hour (ICAS), and putting a brick on the key then walk
/archives//html/Amps/2017-12/msg00206.html (9,300 bytes)

39. Re: [Amps] Sad State of the Hobby (score: 1)
Author: <kstover@ac0h.net>
Date: Fri, 19 Jan 2018 17:22:44 -0600
Except for that 3,000V power supply said rookie forgot about, that kicked his ass across the shack and made is wife a widow. That part always gets left out. If said rookie isn't good enough to handle
/archives//html/Amps/2018-01/msg00100.html (9,922 bytes)

40. Re: [Amps] Sad State of the Hobby (score: 1)
Author: <kstover@ac0h.net>
Date: Sat, 20 Jan 2018 09:57:36 -0600
That's correct. Read the FAQ that Victor has posted the link for. The first reviews are being posted. One by W0YK (RTTY contester) who used the KPA-1500 in the last RTTY contest, says the amp did the
/archives//html/Amps/2018-01/msg00114.html (10,303 bytes)

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