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SCHEMI PRE VALVOLARI
pre EF86 + ECF82 PhaseSplitter / Radford MA12
pre EC(C)82 / Supertone S9
pre 12AX7 CathodeFollower / Jadis
pre 12AX7 + EF80 + 12AT7 / audiotecnic PR306
pre 12AX7 / equalizer
pre 12AX7 / loudness / tone
pre / QUAD acoustical 22
part1
part2
part3
part 4
part5
pre 12AX7 / DynacoPAS3
pre 12AX7 / McIntoshC22
pre 2 stadi ECC82
part1
part2
pre 12AU7 doppia impedenza
pre 6SN7
pre ECL82
pre ECL82 mu follower
pre ECL86
part1
part2
pre 6J5 or 6SN7 con uscita a trasformatore
pre QUAD22
6189 balanced preamplifier
part1
part2
part3
part4
pre phono old 78rpm
part1
part2
part3
ADDED 6-9-2002
pre_6DJ8
pre_Marantz7C_Klone
pre_mic_Altec_1566A
ADDED 18-9-2001
pre_6SN7_6SL7
pre_phono_7586_Nuvistor