Here is a true rare bird from the estate collection of a dear friend who was in the high end audio business for over 35 years. All his gear is immaculate and of the highest quality. This piece sounds great and has rightfully earned its stellar reputation. Few preamps sound this good, and even fewer have survived in such great original condition. Own a fantastic true collectors item that will hold its value.
Up for auction is a very rare JBL SG-520 Graphic Controller preamplifier made by James B. Lansing. Made in USA, and of vintage production. This is a very rare Preamplifier from the golden days of hi-fidelity. Called the "Graphic Control Preamplifier", it uses linear potentiometers for all main controls.
In addition to its outstanding performance specifications, the JBL SG520 Graphic Controller was considered noteworthy for its ergonomic (human factors) design, which was devised by Arnold Wolf as part of his industrial design responsibility. The use of slide potentiometers for continuous controls suggested intuitive operation: the vertical tone controls would either boost or cut the response from a neutral center position; the volume would be raised with upward movement; and the horizontal balance control would favor either the right or left channel by adjustment toward the desired side. Signal source and mode selection was accomplished with illuminated pushbuttons. Unlike rotary switches, the pushbutton bank allowed the user to select the desired operation without having to pass through intermediary positions. The hinged door at the bottom of the face panel served to conceal a variety of less-frequently-used controls and features. To remove the usual tangle of connecting cables from view at the back of the unit the rear panel was recessed and a secondary sliding panel introduced to hide the visual confusion.
As can be seen in the pics, it is in very good cosmetic condition. I would give the unit a 8/10, considering it's age. From a smoke-free home. All the push-buttons are original, have positive action and are very clean. Internall. Comparing to reference pictures, I can see no alterations or modifications. No burn marks, clipped leads or anything that shows the circuit has been tampered with. Music has been played through the tuner, tape, aux 1, aux. 2and front aux. function and played well with no distortion. Phono 1 and 2 were both tested and work fine.
AS AN ESTATE SALE ALL SALES ARE FINAL, NO REFUNDS, EXCHANGES OR RETURNS WILL BE ACCEPTED. BID ACCORDINGLY.
I HAVE TESTED THE UNIT AND IT WORKS AS IT SHOULD, VIDEO OF THIS IS VERIFIED OF WORKING CONDITION.