Q. on OTL projrct.

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Hi.
I'm building 6c33c OTL based the very same schematics
of Andrea Ciuffoli's cheap version 8.2 OCL.
It adopted varifed Futterman's configuration and
two 6c33c's are used per channel. Please refer to
http://members.aol.com/aria3/otlpaper/otlhist.htm
(I'm very sorry that Andrea Ciuffoli's homepage seems not
to work properly now.)
Anyway all the schematics of this kind show the referece
of negative bias for upper output tube is the cathod of
upper 6c33c.(It also coincide with speaker output.)
So two fully independant negative bias must be provided
for upper output tube. (R + L)
My question goes now.
If the referece of negative bias for upper 6c33c
is grounded (0V), what has become of it?
I'm in short of transformer tabs for negative biases, so
want to reduce the demand for negative biases.
Any reply will be much appreciated.
Thanks!

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Topic - Q. on OTL projrct. - umans 17:41:32 12/25/02 (0)

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