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-   -   400Watt PA "SAFARI" (http://www.diyaudio.com/forums/solid-state/221070-400watt-pa-safari.html)

Riff 6th October 2012 11:23 PM

400Watt PA "SAFARI"
 
how to increase power from this amp.
Can I get a 500watt of these pa by replacing the final transistor using 2sc5200/2sa1943 x4?

Riff 6th October 2012 11:25 PM

1 Attachment(s)
Attachment 305053

moschfet 6th October 2012 11:40 PM

Quote:

how to increase power from this amp.
It is not so easy as it seems.
Quote:

Can I get a 500watt of these pa by replacing the final transistor using 2sc5200/2sa1943 x4?
No!

Riff 6th October 2012 11:50 PM

Quote:

Originally Posted by moschfet (Post 3192293)
It is not so easy as it seems.

No!

what are you suggestion?

jaycee 7th October 2012 01:42 AM

That circuit is awful. If you want 500W for PA, you really want something rugged with 5x MJ15003/4 or MJ15024/5 with MJE15032/3 driver transistors. It will have to run reliably on 80V supplies.

You can use 2n5551 for inputstage, mje340/350 for vas. You will need a big heatsink, maybe fan cooled. After all that, you may find it was cheaper to buy a readymade PA amp. Maybe if you can get a scrapped one for the case and heatsinks it is worth it.

Riff 7th October 2012 02:07 AM

Quote:

Originally Posted by jaycee (Post 3192371)
That circuit is awful. If you want 500W for PA, you really want something rugged with 5x MJ15003/4 or MJ15024/5 with MJE15032/3 driver transistors. It will have to run reliably on 80V supplies.

You can use 2n5551 for inputstage, mje340/350 for vas. You will need a big heatsink, maybe fan cooled. After all that, you may find it was cheaper to buy a readymade PA amp. Maybe if you can get a scrapped one for the case and heatsinks it is worth it.

MJ15003/4 or MJ15024/5 is too expensive on my local market...so how if i use 2sc5200/2sa1943 x5?
I've tried the sircuit using 2SC5200/2SA1943 x4 and given the supply 75vdc...for test load 4R 15"+12" device...

Riff 7th October 2012 02:10 AM

MJ15003/4 or MJ15024/5
 
i mean MJ15003/4 or MJ15024/5 is hard to find and even if there is very expensive on my local market,

JOHN BALI 7th October 2012 01:09 PM

Hi Riff
This circuit maybe can stand higher voltage if we change some part value...
I'm also curious which one should be changed or how to modified this circuit???
maybe add VBE TR, add TEF etc.

So someone please give suggestion, which component should be changed to
stand up to +/- 70VDC & the power transistor will be 2SC5200/2SA1943.
Please tell us how many output pairs should be use?


Regards

djk 7th October 2012 01:10 PM

That amplifier will be about 60W/8Ω on a typical 40V supply.

Whoever labeled it 400W was demented/on drugs, etc.

moschfet 7th October 2012 01:23 PM

Quote:

That amplifier will be about 60W/8Ω on a typical 40V supply.
Yes, with an 8 ohm sense resistor. At a speaker, it is probably a bit more:
80-90Watt :D

But 400Watt I also can not see...


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