LS-7B up-grade version assembled & tested
$211.00
LS-7B up-grade version assembled & tested
Modify from classic Marantz 7 preamp, circuit using two 12AX7 and one 12AU7, to lower the output impedance, a cathode follower is used.
A tube high voltage regulator and rectify using 5687
a time delay circuit, a heater voltage regulator using LM317,Analog section up-grade toGerman made GAD coupling capacitor,RA metal film resistor.
board size: L 280mm X W 200mm
(tubes, case and power transformer not included)
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