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Author Topic: Ameritron AL-811 'fixes'  (Read 17562 times)
W8JX
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Posts: 13268




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« Reply #90 on: January 26, 2018, 06:24:09 PM »

He's being very generous regarding his total position. Dumping money in a bad thing. Get an al-80b and forget it. i see them used for about $800. Take care of the tube and will last a lifetime. Mine is still going strong, original to the al 80a built in the mid 80s.

When quality 811s were abundant, it was a marginal viable amp, not the case anymore not matter what you mod.

A used AL 80 series amp is far better than any new AL811 series amp. If you keep it under a 1000 watts tube should last many years.
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Ham since 1969....  Old School 20wpm REAL Extra Class..
W1BR
Member

Posts: 4195




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« Reply #91 on: January 27, 2018, 08:47:33 AM »

He's being very generous regarding his total position. Dumping money in a bad thing. Get an al-80b and forget it. i see them used for about $800. Take care of the tube and will last a lifetime. Mine is still going strong, original to the al 80a built in the mid 80s.

When quality 811s were abundant, it was a marginal viable amp, not the case anymore not matter what you mod.

A used AL 80 series amp is far better than any new AL811 series amp. If you keep it under a 1000 watts tube should last many years.

Input power, or output?  Considering Ameritron uses transverse airflow cooling that puts in the same class as the SB-220, a 1000 watt amp with just enough airflow to provide adequate cooling at rated power.
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K4RVN
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Posts: 261




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« Reply #92 on: January 27, 2018, 09:32:44 AM »

The AL 80 B has bias cut off to save heat when idling and an additional vent in the top cover which improved cooling over the AL 80A.  I know as I have taken temp readings and have owned both. I still have the AL 80A since 1989. The tubes last a long time
At least mine do at one replacement tube in 28 years soon to be 29. I run around 900 watts output but have run 1000 watts to getter the 3-500. I have had the tube made in China for about 6 years now. More bang for the buck than the AL811 which I also bought new and kept three years no problems.

Frank
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