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|30th April 2011, 08:22 AM||#14|
Join Date: Nov 2009
Good schematic, but there s a few misdesigns...
The worse is the use of a MJE340/350 pair as common emitters
part in the cascoded VAS..
It make sense as common base part for the cascodes, although
there s far better devices that suit this purpose.
Also, they use a heavy shunt compensation resulting in a low
slew rate of 40V/uS wich is not really enough for such high
They use 120V 2SA970/2SC2240 as common base part in the
input differential, and althoug it s enough since they see only 72V
EC voltage in normal functionning, they can t sustain the 144V
rail voltage, wich is not cautious since at power on, there can
be quite different conditions than when voltage have settled...
Other than that, construction is serious...
|30th April 2011, 10:34 AM||#15|
Join Date: Jul 2003
This is a PA amp. OK for disco. Built like tank.
Having said that, my amp is rated at 280W per channel and does around 500W into 4 Ohms and it weighs 38Kg . . .
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
Last edited by Bonsai; 30th April 2011 at 10:36 AM.
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