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Old 23rd September 2013, 12:30 AM   #31
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1000 WATT PEAK or 1000 WATT RMS ? I don't think it would be able to result 1000 WATT RMS unless --> the loudspeaker is "1-ohms " with at about 31.5V RMS output (if DC supply at about 63V DC).

(BTW, it so overkill to parallel 8-speakers to get 1-Ohms impedance )
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Old 23rd September 2013, 04:36 AM   #32
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I think we all realise that ratings like this for simple, low voltage designs are either using technical tricks like PMPO estimations (they won't be measured results anyway) or specifying the device for operating conditions that would destroy it instantly.

Either way here though, whether it is normal commercial practice in Indonesia or not, it's just lies and deception.
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Old 23rd September 2013, 07:15 AM   #33
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I heard the rumor which mentions that the *n* group/forum on Facebook even disallow the discussion of electronic theorems and will kick out a member who talking about formula or electronic theorems on the group wall.
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Old 23rd September 2013, 07:37 AM   #34
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Quote:
Originally Posted by Ian Finch View Post
Either way here though, whether it is normal commercial practice in Indonesia or not, it's just lies and deception.
Yes it is normal. Anyway they like the amp not because it is 1000W. This amp is similar to the other old and famous 68watter (1000W is too far away). Very simple but the sound is decent.
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Old 23rd September 2013, 08:01 AM   #35
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That so tragic, if that is really a "normal" commercial practice in Indonesia. I don't think that all "normal" peoples at Indonesia will agree.

Last edited by janubian; 23rd September 2013 at 08:28 AM.
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Old 23rd September 2013, 09:20 AM   #36
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When you see "10kW Car Hi Fi sound system", like you can see promoted in many Asian and Middle Eastern countries, I think you know this is not just Indonesian marketing. This is systematic exaggeration of product claims to get more sales. If the countries have no legal protection for consumers, and many countries don't, or don't uphold their own laws, sellers just get as ruthless and exaggerate as much as they need to sell more products. 'Too bad if your amplifier only produces 500W total RMS or as much as your car generator can supply it.

How many would think to test or pay to have someone test their amplifier for power output? Most guys will be happy if speakers make the doors flex at about 20W bass. It's probably good to have no idea about real power levels and what they mean, as long as the money you pay is not greater than the appropriate selling price for what you really get. As Onto said (I think), 1000W is too far away - perhaps meaning that no one will seriously expect that level of performance or such a power is inconceivable.
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Old 23rd September 2013, 10:20 AM   #37
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I found that VAS current mirror will result impedance at about 19.5 kilo Ohms ~ 20 kilo Ohms. Implement TIP41/TIP42 is so overkill for VAS & current source of VAS with such kilo-ohms impedance.
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Old 23rd September 2013, 01:13 PM   #38
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Now you raise the big questions like "how much audio power can I get using obsolescent, low voltage, industrial power transistors?" This design is audio at its worst, where parts are selected from just a few widely available but most important - very cheap industrial transistors.
TIP 41 has 100V Vceo(max) but BD139 only 80V, so what happens ? The designer selects the crap power transistor for the VAS because it has higher rating, but that says nothing about linearity as you exceed the basic TIP 41 40V SOA. This is not good thinking - it might be better as a motor drive rather than audio amplifier, even if it does work.

40 years ago, I guess it might have been worth using in poor areas but it won't hold together approaching its ratings without extensive protection circuitry or a lot of repairs - a disaster in the making and unless you like PA with a "certain" sound quality, the public will be far from impressed.
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Old 23rd September 2013, 03:54 PM   #39
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Yeah, I agree with you Ian ...

(And I hope that we will not find any other jokes as we may find yet another "special" power amp schematic that even with VAS implemented MJ15004 )
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Old 28th September 2013, 11:21 PM   #40
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Ah. You may not know what noob trying to modify. They don't know much about electronic knowledge, but ears and luck sometimes comes together.
From the name (namec) and 1000W, seems that the owner like it so much. (as I know, it is not a comercial amp)
It is not best, but simple with decent sound.
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