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Author Topic: AL 80B Vs AL 572B  (Read 654 times)
KE7EOZ
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Posts: 119




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« on: October 08, 2008, 03:36:32 PM »

I am thinking to purchase either Al80B or 572, I would like to hera some imput in wchi one would be the best option
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K9FON
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Posts: 1012




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« Reply #1 on: October 08, 2008, 04:29:10 PM »

The 572 will do more power but the 80B uses the much more rugged 3-500Z. I guess it all matters on what you really want. The 80B is around the same rpice as the 572.  
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WB2WIK
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« Reply #2 on: October 08, 2008, 05:43:17 PM »

Six of one...

But I like the 80B because it's only one tube, not four, and it's a tube of more modern design available from more sources.  The rest of the amp is nearly identical.
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W1QJ
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« Reply #3 on: October 08, 2008, 09:26:58 PM »

AL-80B good solid amp, AL-572, problematic.  Go with Al-80B.  If your decision is on a bit more power, then go with the Al-82 for sure.  
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WW5AA
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« Reply #4 on: October 09, 2008, 03:31:16 AM »

I have both. It would be a hard choice between the two.

73 de Lindy
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W9PMZ
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« Reply #5 on: October 10, 2008, 03:49:13 AM »

I've used both.

The cost of 4 572Bs is about the same as a 3-500Z.

Of course the AL-572 will do slightly more power; but I don't really recommend driving amps to the last watt out.

In reality 4 tubes have more probability of breaking than one tube.  Looking at RF Parts web page there looks to be just as many OEMs for 3-500Z as compared to 572B.

I do know that there have been issues with the Chineese 572Bs due to arcing; no idea about Chineese 3-572Bs.  Seems like these two tubes now come from China, for the most part.

I did have an arc on my AL-572B, took out the switch (instantenous bias feature); the amp was biased all of the time in xmt.  $2 fixed that.  It was my fault, trying to load a non-resonant antenna.  I did have an L-4B, two 3-500Z in that amp are very forgiving under all circumstances.....

Cost, watts to dollars - AL-572
Reliabily - AL-80B
Cost, raw - AL-80B

I'd rather have my old L-4B back.......

73,

Carl - W9PMZ
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AE5I
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Posts: 124




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« Reply #6 on: October 25, 2008, 09:05:14 AM »

I considered both amps last year and decided on the AL-572.  It's been a very good amp and I'm totally happy with it.  I run CW on it most often and it runs cool and doesn't give trouble.

I think you'd like either one, though...

73

Tom
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