LS-7B bare board
$23.00
LS-7B bare board
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.
board size:L 280mm X W 200mm
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