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Old 1st March 2006, 03:06 PM   #1
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Default using MJL21193/4 in Leach or the M250

Hi,

Just want to know if we can directly replace the output trans in both amp. with the new MJL's without any modifications?

How about MJ15003/4 in the M250?

M250 at :
http://www.atjoo.hostiz.com//m250.html

Super Leach at :
http://users.ece.gatech.edu/~mleach/superamp/

Thanks
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Old 1st March 2006, 08:40 PM   #2
DIYdo is offline DIYdo  United Kingdom
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No problem on the M250 as long as you don't remove the spiking diodes on the output.
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Old 1st March 2006, 11:29 PM   #3
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Hi DIYdo,

You mean both the MJL21193/4 , MJ15003/4 will do?

Thanks
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Old 2nd March 2006, 01:44 AM   #4
djk is offline djk
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More MJL devices are required due to lower maximum junction temperatures and lower wattage ratings. Check for stability with the faster devices.
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Old 2nd March 2006, 10:21 AM   #5
DIYdo is offline DIYdo  United Kingdom
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I would go for the MJ devices as the To3 can is superior for heat dissipation. The OPS is configured as EF so will be tolerant to most transistors in terms of stability.

Was just looking at the way the LTP is configured. I would be inclined to reduce the value of C8 to under 20P (or remove completely), Increase R14 to 22k, R15 to 680ohm, and replace R3 with a conection directly to 0v. Having said that I have not built the amp or tested it, I'm sure he has a good reason for doing his design as such.

I notice that there is also no active current limit through the VA stage for when the VI limiting activates. I would be inclined to do something with that aswell. Just my preference anyway.
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