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Old 22nd September 2013, 05:46 PM   #2651
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Quote:
Originally Posted by nazirdigi View Post
b500 tef tested with p.audio ,challenger c18el 1200w one sub and one top per channel,(300w per speaker in top)
powerful sound,
for diy members pls try to buy 15 inch speakers or 18 inch speaker, without good speakers u cant hear the powerfull sound.
useless of making powerfull amps.
Nice work, I suggest some of my speaker box design for more powerfull sound.
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Old 23rd September 2013, 05:51 AM   #2652
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ok apex sir i will try to make ur boxes.
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Old 23rd September 2013, 07:49 AM   #2653
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Originally Posted by nazirdigi View Post
ok apex sir i will try to make ur boxes.
Speaker boxes is in this thread DIY PA Speakers Setup (Line Aray)
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Old 24th September 2013, 03:19 AM   #2654
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hello,sir can i used 2sc3281 instead of 2sc5200?? morning to all
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Old 24th September 2013, 03:44 AM   #2655
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good morning to all, can i used 2sc3281and 2sc1302??? instead of 2sa1943 and 2sc5200?? thanks......waiting for your reply guys....i want to confirm first before i put this in my b500.. =) sorry double post =(

Last edited by sandman15th; 24th September 2013 at 04:11 AM.
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Old 24th September 2013, 06:43 AM   #2656
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Toshiba 2SC3281/A1302 have been obsolete more than 13 years. Virtually all these parts still available have been fakes for many years. Perhaps you have no clue what you really have and so it would not make sense to compare them with anything unless you really can test them at high power. At 500w, you are playing with fire using bogus components.
Wingshing and Mospec (Taiwan) make fair clones, however. You can use them though Vceo is only 200V compared to 230V. Who is the manufacturer marked on your transistors?

If the Toshiba 3281/1302 parts are genuine, they will be worth more to you as collector items to sell, than any 500W amplifier!
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Last edited by Ian Finch; 24th September 2013 at 07:00 AM.
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Old 24th September 2013, 07:33 AM   #2657
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Quote:
Originally Posted by Ian Finch View Post
Toshiba 2SC3281/A1302 have been obsolete more than 13 years. Virtually all these parts still available have been fakes for many years. Perhaps you have no clue what you really have and so it would not make sense to compare them with anything unless you really can test them at high power. At 500w, you are playing with fire using bogus components.
Wingshing and Mospec (Taiwan) make fair clones, however. You can use them though Vceo is only 200V compared to 230V. Who is the manufacturer marked on your transistors?

If the Toshiba 3281/1302 parts are genuine, they will be worth more to you as collector items to sell, than any 500W amplifier!
=) thanks for the reply, this one is toshiba made in japan.. i have four of this..=)
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Old 24th September 2013, 09:24 AM   #2658
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by sandman15th View Post
=) .................is toshiba made in japan.. i have four of this..=)
if you bought these recently (say in the last 5years) then they are probably fakes.
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Old 24th September 2013, 09:51 AM   #2659
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It would be a very stupid fake that didn't have identical markings to the originals, if it said Toshiba.
Now, what is the colour of the 2SA1302? When and where did you buy them?

In any case, won't you be needing quite a lot more and matched pairs to build a 500W amplifier?
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Old 24th September 2013, 10:16 AM   #2660
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@andrew t
i build b500.when i test it with +-24 volts the amp works fine but when i replaced the supply with +-55 volts the + fuse blown and the trannies were damage.what could be the culprit of this problem?
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