Electronic Audio Switch
Datec. 1946
Inventory NumberWJ0311
ClassificationSwitch
Subject
Dimensions17.8 x 48.3 x 35.6 cm, 21 lb. (7 x 19 x 14 in., 9.5 kg)
Signedin white on front, top: ELECTRONIC SWITCH / MODEL 829-2-14
Inscribedin white on front, bottom center: PSYCHO-ACOUSTIC LAB. / HARVARD UNIVERSITY
in red on back: ISSUE #510
stamped in orange on top of tube cover: (in squareS) E; C ; 1; B; 2
stamped in orange on side of motor: (UTC logo) / R13
stamped in orange on side of coils: (UTC logo) / R-20
on side 6 of tubes: SYLVANIA / MADE IN U.S.A. / 8 / 5 / 2 / VZJ / (Sylvania logo) / 12AU7
on side 2 of tubes: SYLVANIA / MADE IN U.S.A. / 8 / 5 / 2 / VZJ / (Sylvania logo) / 12AX7
on side 6 of tubes: SYLVANIA / MADE IN U.S.A. / 6AL5 / A6A / (Sylvania logo)
base of 1 tube: KEN-RAD / MADE IN U.S.A. / 54 / R
base of 1 tube: RADIOTRON / ELECTRON / TUBE / (RCA logo) / MADE IN / U.S.A. / KN / \ RCA
stamped into side of rectangular covers: CP6981EF105K / AEROVOX 618 MCB / 1.0 MFR 600 VDC / A
on back of grey rectangular pieces: UNITED TRANSFORMER CO., NEW YORK / (UTC logo) A-20 / MADE IN UNITED STATES of AMERICA
on 1 of the tube covers: A-048 / UPT4045 / 40 MFD. 450 W.F.D. / CORNELL-DUBILIER / 85C LE
on 1 of the tube covers: B045 / UPT4445 / 40 MFD. 450 V.W. / CORNELL-DUBILIER / 85C FD
on 2 of the tube covers: D013 / UPT222245 / 20 MFD. 450 V.W. / 20 MFD. 450 V.W./ 20 MFD. 450 V.W./ 20 MFD. 450 V.W. / CORNELL-DUBILIER / 85C FD
Cutler-Hammer
Accessories: Stored in "BARRISTER" cigar box
Object number: 1998-1-1512
Fritz Köhler
Date: late 19th-early 20th Century
Object number: 0384
Leeds & Northrup Company
Date: late 19th-early 20th Century
Accessories:
Object number: 0283
