diyAudio Forums Archive > Top > Amplifiers > Solid State Lower supply rails for this amp? - Click HERE for Original Thread mik Can this amp run on +40/-40 supply rails? Thanks! http://www.futura-shop.com/pdf_ita/7100-FT15K.pdf Christer Shouldn't be any problem as far as I can see, but the maximum output power will be lower, of course. A rough calculation would be around 55W in 8 Ohms. Maybe one should lower the value of R3 correspondingly, but that is probably not necessary. mik Thanks Christer! I think that 55W in 8 ohms are enough ! djk Change R3 to 39K Because of the lateral MOS this amplifier will only do about 40W at 8 ohms with a simple ±40V supply. The Hafler DH120, SE120 use about the same circuit and ±52V and do 60W/8R or 90W/4R(1Khz) http://www.hafler.com/techsupport/index.asp?ID=3 mik DJK Thanks for your suggestions!

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