Path: utzoo!utgpu!watserv1!watmath!att!att!linac!uwm.edu!csd4.csd.uwm.edu!info-high-audio-request
From: FCFIFRAGA%CIUC2.UC.RCCN.PT@CUNYVM.CUNY.EDU (FRANCISCO AMARAL F FRAGA)
Newsgroups: rec.audio.high-end
Subject: OTL amplifiers
Message-ID: <7355@uwm.edu>
Date: 1 Nov 90 13:47:50 GMT
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Originator: tjk@csd4.csd.uwm.edu


     I received some feedback about OTL amplifiers, which I tried
to acknowledge, but surely due to the mailing system features and
my poor knowledge of networks and addressing systems some of the
replies were returned to me as undeliverable. I am still trying to
fix it.
     In a future posting I will summarize the messages I received.
All the feedback I got was about the Futterman's, no reference was
made to the Technics 20A. I am still choosing the model I will
built. The Futterman OTL3 is coupled through a 2200 uF capacitor in
parallel with some decoupling film capacitors and the Technics is
DC coupled ( the power supply is symmetrical), and besides the
components for the Technics are cheaper and easier to obtain in
Europe (if one can accept replacing the output 50HB26 valves with
EL519's). I have heard both, but conditions were so different that
I am not able to make a choice based on this auditions only. I
think that the Futterman had a fuller and more brilliant sound and
the Technics had more speed and better bass.
     If some one knows something about the Technics 20A, please
Email me, as his views will be welcome.

........................................................
Francisco A. F. Fraga
Dept. Physics
Univ. Coimbra
3000 Coimbra PORTUGAL tel. 351-39-34668 fax 351-39-29158
FCFIFRAGA@CIUC2.UC.RCCN.PT