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Old 28th January 2013, 07:04 PM   #1
ief is offline ief  Netherlands
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Default Class ab2 power amp good/ bad?

Got myself a new amp to try and fix (better said, will get it tomorrow when things go well) and now the user manual states "The
output stage is arranged in a full complimentary format
for class AB/2 operation" and I thought, that's a first, never heard of that before.

Now I treid to search and find some info but most (if not all) seems to relate to tube gear and HAM transmitter amps but not so much for a solid state (hifi) power amp. If I understand correctly it has to do with the bias and it being lower that normal AB and I can't seem to think of a reason why that would be good, other thing seemed to suggest it has to do with getting more power but in this case that would be 145 watt in 8 ohm with 2 output pairs (mj21194/93) witch doesn't seem much (?) (and somehow it doesn't seem to be a cost thing either)

Perhaps its just sale pitch mumbo jumbo or is there more to it then that?

AB international precedent 1450 is the amp.

Last edited by ief; 28th January 2013 at 08:09 PM. Reason: edit: not 3 pairs, but 2.
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Old 28th January 2013, 08:41 PM   #2
JMFahey is offline JMFahey  Argentina
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No news!!
*All* bipolar transistor Power amps are "Class AB2" , just most forget writing the "2".
AB systems is being accurate, nothing else.
And .... don't overthink it
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Old 28th January 2013, 08:54 PM   #3
ief is offline ief  Netherlands
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Originally Posted by JMFahey View Post
And .... don't overthink it
Lol, guess you hit the nail on the head right there, hehe.

Tnx though, good to know for sure!
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Old 28th January 2013, 09:06 PM   #4
sreten is offline sreten  United Kingdom
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AFAIK you cant apply AB1 and AB2 valve classes to transistors.

Its simply aB for low / optimum bias and AB for some extra class A.

rgds, sreten.
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