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Author Topic: 1 KW Amp  (Read 3592 times)
N0WE
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Posts: 17




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« on: November 26, 2005, 04:18:28 PM »

I am looking for a dependable amp that will do at least 1 KW in the $1000 to $1200 range. Anyone have any recomendation on a used amp?
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K0BG
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« Reply #1 on: November 26, 2005, 07:23:27 PM »

Other than a used one, you're sort of out of luck. Unless, of course, you build one.

MFJ's 811H has a street price of about $750, and is about a dB shy of a 1KW out amp. If you treat it with respect, the amp will last years, and so will the tubes. And the average joe ham will never know you're not running a full KW out.

Alan, KØBG
www.k0bg.com
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K7PEH
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« Reply #2 on: November 26, 2005, 07:59:39 PM »

The Ameritron AL-572 is $1299 *new* from HRO and they will ship for free so that is close to your budget.  It will do better than 1 KW, about 1300 watts.  I have one and it is pretty good, super easy to tune.
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KA9CCH
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« Reply #3 on: November 26, 2005, 09:12:28 PM »

How about a Heath SB220, well documented and easy to work on.

Used for under $500.  
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N3JBH
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« Reply #4 on: November 27, 2005, 09:51:57 AM »

heathkit sb-220,ss-1000 ameritron al-80-b kenwood ts-922,
drake L-4b some the older henry's. there several amps out there in your price range that are good ole amp's. you shouldnt have any problem finding one these amps in excellent shape shipped for under $1000.00 all you need to do is search the listings here and on www.qth.com and youll be  ready to go
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K0CWO
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« Reply #5 on: November 28, 2005, 09:13:04 AM »

AL-80B
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WB2WIK
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Posts: 21837




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« Reply #6 on: November 28, 2005, 11:42:17 AM »

Modern desktop amp: AL-80B.  You can almost buy a new one for $1200 (I think it's really $1299).  However, that amp just about exactly hits 1 kW PEP and doesn't fall into the "at least" category by much.

For "at least" 1 kW (meaning, let's shoot for 1500W), a used Henry amp like a 2K-4 or any of the 3K family will easily do it and won't cost more than about $1200 -- the older ones are much less.  However, unless you get a newer model like a 3K Classic III or 3K Premier, or later (units manufactured after about 1987), you won't get 160m band coverage.  All Henry amps manufactured prior to 1986 do not include 160m.

Older Alphas can be found in this price range, too: However the ones that are this "cheap" mostly use 8874 tubes, which were good tubes at the time but are no longer manufactured by anybody so they're becoming "unobtainium."

SB-220 will run a bit over 1 kW and is a great workhorse (no 160m, though), and how it will work for you is based almost entirely upon who built it and who took care of it after that.

Drake L-4, L-4B or Swan Mark-II all use dual 3-500Zs and will run more than 1 kW and can all be good choices if found in good condition (well maintained).

Best bang for the buck is likely the AL-80B, and it does cover 160m.  

WB2WIK/6

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KB3LXY
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« Reply #7 on: November 28, 2005, 12:43:35 PM »

I have a MK-2 (Swan) that will get to the legl limit. The thin is built like a tank...and can be found in the $500 dollar area.
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N0WE
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Posts: 17




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« Reply #8 on: November 28, 2005, 12:52:14 PM »

Thanks for all the responses. I am leaning toward a new Ameritron but I am a little concerned about the negative reviews. I suppose it's like most MFJ products, very little quality control. $1299 is definatley within the budget.
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WB2WIK
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« Reply #9 on: November 28, 2005, 03:05:59 PM »

Ameritron and MFJ are separate factories.

However, there can still be workmanship issues, I'll grant that: With my brand new AL-80B (purchased nearly five years ago now), I had an unsoldered wire that rendered the brand new unit non-operational until I found and fixed it.  Thankfully, that took all of five minutes -- still, an inconvenience.

The advantages are it really is a solid design, the component selection appears up to the task of long operating life, it uses a good tube with multiple sources and likely to be available for several years to come, and of course a new product comes with a warranty!

Good luck whichever way you go.

Steve WB2WIK/6

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K7PEH
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« Reply #10 on: November 28, 2005, 07:50:20 PM »

Ameritron AL-572 versus Ameritron AL-80B ?

So, I wonder how these two compare.  I have the AL-572 and I think it is a pretty good amplifier and so far, with maybe one minor exception, the Ameritron construction is OK.  The one little problem is that a few months after I got it, the tube filaments went dead.  Cause was a cold solder joint right at the tube base of one of the 4 tubes.  I fixed it within 3 or 4 minutes of finding it.  Ameritron very nicely designed in a nice removable access panel right under the 4 tube sockets.  I never had to remove those dozen or so screws to take the top off.

But, when I got the AL-572 I did go through that decision process on whether to get this amp or the AL-80B.  At that time, most of the recommendations I got from others pointed to the AL-572 but today it seems that there are multiple recommendations for the AL-80B.

So, does anyone know how these two amps really stack up against each other?  What are the pro/cons of one tube versus 4 tubes.  Is that extra 300 watts really worth it for the extra $50 (probably not).
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WB2WIK
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Posts: 21837




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« Reply #11 on: November 29, 2005, 08:06:24 AM »

I'd prefer the AL-80B, all else being equal, simply because of the tube.  

Nobody's making really good 572Bs anymore, and practically all the problems and failures with these amps have been the tubes.

There are still multiple 3-500Z factories, including Philips in France, a couple in China, maybe others, and the tube is a workhorse.  NOS Eimacs are easy to find and inexpensive -- not that they're any better, it's just another source.  In a pinch, a 4-400 will work (same socket, etc).  I like that kind of versatility, since I worry that someday soon it's possible that nobody will be making 572Bs.

WB2WIK/6
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W9WHE-II
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« Reply #12 on: November 29, 2005, 01:25:47 PM »

AL-80B
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N9FME
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Posts: 75




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« Reply #13 on: November 30, 2005, 01:40:41 PM »

I'd have to jump in and say that the AL-572 is a great buy for the price..I lucked out and found one on ebay about a year ago for about half the price of a new one.

Granted, I don't think those deals come along too often but when they do, they are sweet so keep your eye out and you might be surprised! The 572 has been a great amp and it is super easy to tune..Good Luck!

73's
N9FME  
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5R8GQ
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Posts: 203




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« Reply #14 on: January 08, 2007, 06:10:35 PM »

Used well cared for AL80A. Yes, "A".
It is amuch better amp than the AL80B.
It has a beefier power supply, is made of metal, not
a plastic front, has a better blower, and wired for 220v will put out 1 KW RTTY %100 Duty Cycle,
and peak to 1.2 KW SSB. This is my contest and travel amp. I have had it for many years, taken it all over the world and have had NO PROBLEMS with it. Oh yeah, Ameritron will point out the soft inrush protection and the bias turn off between words. = MFJ Advertisement Copy BS for new hams.
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