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 Post subject: Hiraga's Le Monstre 15W
PostPosted: 28 Nov 2013, 18:31 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
Hi Guy's ,
Once again i got stuck on a little project for a friend of mine in form of a Le Monstre 15W from Jim's Audio and as
usual the documentation is little bit thin.
On the board is a trimpot (100R) which i belive is for setting bias ? but nothing of that in "manual",
is the value i want to be as low as possible or is there a "magic" setting for this amp ?
where is the testpoints for setting of bias ?
i also was recommended for power transformer a 2x9V - 2x4A (80VA) is that enough or should i go for a 160VA ?
and for Psu i was recommended of Jim a Pass CRC but instead of 10000uF i have 15000uF caps.
I post some pics on this project.


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PostPosted: 29 Nov 2013, 06:57 
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Joined: 23 Aug 2008, 06:51
Posts: 25
This is a Class A amp so there is no output "bias" as the output transistors run at full output all the time. The trimpot is to set the output DC level which, after warming up should be adjusted so that the output is as near to zero volts DC - referenced to earth - as possible.
The original supply see http://sound.au.com/tcaas/monster27.htm should be + & - 12v at a minimum of 60VA. A 9 - 0 - 9 v AC transformer when rectified will give approx +12 and -12v DC. So 80VA will be ideal.
15000uF caps will be OK.


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PostPosted: 29 Nov 2013, 07:15 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
OK got'it !! Thank you very much "bone" for your answer.


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