OTL Asylum

OTL, Output Transformerless Amplifier User Group.

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Modified Futterman OTL amplifier

Posted by cellai@space.it on June 2, 2008 at 04:44:44:

Thanks to tubetvr and Lew suggestions I have just built and tested this OTL amplifier. The schematic is different from my previous candidate scheme (see message dated April 8th, 2008). This is a modified Futterman design (in order to get the lowest output impedance possible)with some moderate feedback. The tubes are (4X)6080/(1X)6SN7/(1X)12AT7 per channel. To me it sounds very good.I think this amplifier is not too difficult for DIY. I am open to deliver the complete schematic (power supply and amplifier) to all interested readers (e-mail a request to cellai@space.it).

Thanks again to tubevr and Lew.