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Old 14th July 2013, 12:24 PM   #1
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Join Date: Jul 2013
Default How do you think about this amplifier?

Namec 1000 watt
You can find it here,
https://www.facebook.com/groups/294726640658173/
but this is a closed group
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Last edited by shinoby; 14th July 2013 at 01:05 PM.
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Old 14th July 2013, 02:28 PM   #2
djoffe is offline djoffe  United States
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Join Date: Oct 2008
I don't want to say anything bad about someone's design. But there are many potential problems in this design...not an exhaustive list by any means
1. 50 Volt caps on 65 volt rails
2.TR4 current source has no power supply rejection
3. no hi-freq input filter
4. really high closed loop gain of about 214
5. C3 R6 corner is only 15 Hz (causes LF distortion)
6. R9 and R10 kind of high to drive so many output transistors
7. output stage is probably under-biased
8. no hf bypassing on the rails.
9. 2.2 mA in TR4 probably not enough to drive the kind of output currents you seek
10. Input biasing guarantees unbalanced first stage.
11. output power statements kind of optimistic

That's enough for now...although the phase inverter could probably use a lot of work also.
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Old 14th July 2013, 06:12 PM   #3
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Location: Los Angeles
How about TIP41C and TIP42C are only 100V devices (Fairchild data sheet) and you're running 130 Volts.

G
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Old 14th July 2013, 07:36 PM   #4
ilimzn is offline ilimzn  Croatia
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Join Date: Feb 2005
Location: Zagreb
Looks like one more wishful thinking designs. Often these actually make it into production in China and are then sold around the world...
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