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Old 23rd July 2007, 03:45 AM   #21
djk is offline djk
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Look at the current gain above 1A.
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Old 23rd July 2007, 07:12 PM   #22
anatech is offline anatech  Canada
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Hi djk,
Hmmmm. I normally use MJE15032 and MJE15033 anyway. I'll have a closer look. There must have been a reason why because I'll typically use the highest voltage part in a series unless something changes.

Thanks for the heads up.

-Chris
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Old 26th July 2007, 06:51 PM   #23
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hi i have to ask this question again i have order the 15032/33 but they have 3 pins coming out of them the ones in the amp have only two what am i missing here the 2dd525 and 2sb595 are no longer available do i just leave the collector pin standing ?????? and use the base and emitter would someone please tell me whats wrong here thank you
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Old 26th July 2007, 08:32 PM   #24
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At the rick of repeating myself:

"The metal tab on the TO-220 case is the collector."

Cut off the pin if it offends you.
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Old 26th July 2007, 09:01 PM   #25
anatech is offline anatech  Canada
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Hi djk,
Quote:
"The metal tab on the TO-220 case is the collector."

My gosh that's funny. Now watch him buy a fullpak!

Hi changsecho,
Firstly, make sure you have purchased the metal tab types. Then, as djk said ...
Quote:
Cut off the pin if it offends you.
Cut the center pin off flush with the bottom of the case if you can. If you leave the pin hanging out, it may get bent and short later on.

Those parts you will order are improved substitutes for the originals from a voltage / current perspective.

-Chris
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Old 29th July 2007, 05:15 PM   #26
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hi everyone want to thank you for clearing up that fact on that driver transistor it;s up and runing now sounds great and lots of power i would like to get some output on whether i should change all the transistors in the driver board if so are the transistors made my on are they good ones also would adding on 22uf 100 volts capacitors to the power outputs capacitors give me more bass i;ve seen here on the post where they have added them you all have been much help thank you very much
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Old 29th July 2007, 05:32 PM   #27
anatech is offline anatech  Canada
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Hi changsecho,

I will now repeat myself from an earlier post . Okay ?
Quote:
Firstly, when you post, please use punctuation and caps when required. We are not going to waste time reading your posts a couple times to understand them.
Your posts are difficult to read and it is wasting my time trying to read them. Please have some respect for others that read what you have to say.

Now, how many parts were bad? What were the part numbers?

You don't really get more bass by increasing the filter caps unless you are driving the amplifier hard into a low impedance load. What are the speakers nominal impedance and how many per channel are you using?

-Chris
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Old 29th July 2007, 10:15 PM   #28
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Hi,

I want to add bypass caps to the big 'lytics of my GFA-555. What should be the appropriate bypass caps to use? I searched the previous posts but somehow couldn't find the values other member had experimented.

Thanks!!
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Old 29th July 2007, 10:25 PM   #29
anatech is offline anatech  Canada
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Hi Fred,
What most people don't realize is that there are already bypass caps mounted on the output boards. But you can play, just don't make a mess.

-Chris
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Old 29th July 2007, 10:37 PM   #30
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Thank you, Chris!!
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