tweaking a class AB amp

blunt · 20th March 2007, 09:27 PM

Hi all.

I am new to this forum so bare with me. i am kind of a noob when it comes to audio but i have build a class AB amp based on BD 139/140 transistors.

it amplifies arround 60 watt and plays very good. But i talked with my teacher and he said that it could play even better if i had better effects transistors but i dont know how to see if a transistor is better for the purpose(this is problerly still because i am a noob) so i was hoping that someone could reccomend me some. prefereable would be arround 100-150 watt output per channel.

if you need schematics or any other information about the amplifier please say so. I hope this can be a good start for me making alot of DIY audio projects so it would be nice if my first amp would perform good.

BTW i am building a pre-amp for it atm based on the tda2415A if that can help.

Cheers
Anders "blunt"

Nelson Pass · 20th March 2007, 10:26 PM

I suggest you post this request on the Solid State forum,
where more people are familiar with the BD139/140

blunt · 21st March 2007, 09:19 PM

sry i will do that then.

20th March 2007, 09:27 PM	#1
blunt diyAudio Member Join Date: Feb 2007 Location: Denmark	tweaking a class AB amp Hi all. I am new to this forum so bare with me. i am kind of a noob when it comes to audio but i have build a class AB amp based on BD 139/140 transistors. it amplifies arround 60 watt and plays very good. But i talked with my teacher and he said that it could play even better if i had better effects transistors but i dont know how to see if a transistor is better for the purpose(this is problerly still because i am a noob) so i was hoping that someone could reccomend me some. prefereable would be arround 100-150 watt output per channel. if you need schematics or any other information about the amplifier please say so. I hope this can be a good start for me making alot of DIY audio projects so it would be nice if my first amp would perform good. BTW i am building a pre-amp for it atm based on the tda2415A if that can help. Cheers Anders "blunt"

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20th March 2007, 10:26 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	I suggest you post this request on the Solid State forum, where more people are familiar with the BD139/140

21st March 2007, 09:19 PM	#3
blunt diyAudio Member Join Date: Feb 2007 Location: Denmark	sry i will do that then.

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