Pleasant sound, with good soft bass, good "middle", a certain alloy of transistor detail and lamp heat. Plus power is connected to the "ground". Design - phono corrector on a GE transistor;. You must have soldering skills and understand electronics!
TRANSLATING STEREO -CIRCUIT TERMINOLOGY - PDF Free Download
JBL James B. Lansing Rare SG 520 Graphic E For Sale
stereonomono - audio Hi Fi Compendium - 14 years on-line: JBL SG 520
Magic Moment: JBL Graphic Controller Preamplifier & Solid State Energizer Modification
ETI 1978-08 August, PDF, Amplifier
germanium Preamp?, Page 11
What made the SG520 a must-have?. Imagine crystal-clear highs and thumping lows, turning every session into a nostalgic dance-off. No P.O. Boxes.
JBL SG520 Graphic Controller Preamplifier
EAR 834P Clone Tube MM Phono Preamp For Sale - US Audio Mart
MM Phono preamplifier fully GE transistor. The phono circuit was developed by Beslik A.I. (Беслик А.И.). ,who is a well-known author of many circuits
Assembled phono stage board PCB DIY phono preamp MM / GE transistor Preamplifier