Hey guys!
I recently found some transistors in a box of stuff in the shop,and was thinking of building an amplifier around them,and some suitable power supply components I have. About 70Vdc per rail, suitable for ~150Wpc stereo amp..
The transistors are MJ15011/12
(10A 250V 200W)
I have 2 pairs here in my hand,and probably have a few more if I keep looking.
Can anyone suggest a circuit I could follow,or give me any other pointers for building an amp around them?
I have built one subwoofer amp from the ground up before,mostly cobbled together from what I had in my junkbox,and a schematic I had.It wasn't bad for what it was,Made the neighbors complain,so it was plenty.
I'm aiming for something a bit better this time around,preferably stereo,maybe bridgeable.
I was looking at the Leach Low TIM amp,but wanted to get a few more ideas first.
TIA for any input! Patrick.
I recently found some transistors in a box of stuff in the shop,and was thinking of building an amplifier around them,and some suitable power supply components I have. About 70Vdc per rail, suitable for ~150Wpc stereo amp..
The transistors are MJ15011/12
(10A 250V 200W)
I have 2 pairs here in my hand,and probably have a few more if I keep looking.
Can anyone suggest a circuit I could follow,or give me any other pointers for building an amp around them?
I have built one subwoofer amp from the ground up before,mostly cobbled together from what I had in my junkbox,and a schematic I had.It wasn't bad for what it was,Made the neighbors complain,so it was plenty.
I'm aiming for something a bit better this time around,preferably stereo,maybe bridgeable.
I was looking at the Leach Low TIM amp,but wanted to get a few more ideas first.
TIA for any input! Patrick.
I have a Leach with three pair of MJ15011/15012, it does 300W/4R on ±63V
The Mark Levinson ML3 used ten pair of MJ15011/15012 on ±80V
The MJ15011/15012 has higher SOA at 100V than the more popular MJ15024/15025
The Mark Levinson ML3 used ten pair of MJ15011/15012 on ±80V
The MJ15011/15012 has higher SOA at 100V than the more popular MJ15024/15025
I recommend the Leach Superamp if you can find enough, it uses an ingenious cascoded output stage, or one of Randy G. Slone's designs.
Good luck.🙂
Good luck.🙂
The 10A rated MJ15011/12 with the gain spec'd at only 2A would be a poor choice for the Super Leach. Leach used the 20A MJ15003/04 for good reason.
The Heathkit AA1800 is a series connected Leach design with MJ15024/25, these have good Beta at 8A
The Heathkit AA1800 is a series connected Leach design with MJ15024/25, these have good Beta at 8A
Matched?
Hi DigitalJunkie.
Only for reminding!
Are the tranzistors matched?You can't just take them and put it in the amp.Good amps are made with perfect matched output tranzistors.
Take this as a important advice!
Regards friend.🙂
Hi DigitalJunkie.
Only for reminding!
Are the tranzistors matched?You can't just take them and put it in the amp.Good amps are made with perfect matched output tranzistors.
Take this as a important advice!
Regards friend.🙂
I don't know if they are matched.They are packaged as complimentary pairs in little plastic bags.
I did manage to find 5 more pairs,so finding some matching sets should be do-able.
I did manage to find 5 more pairs,so finding some matching sets should be do-able.
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