S. O. 765244
INSTALLATION
Subject:
Date
Nov. 29, 1935
AND
Number
3.1640-B
SERVICE DIVISION
MODEL D22-1
Classification
Instructions
RCA Manufacturing Company, Inc
and
NATIONAL OFFICE
Activities
Camden, N. J.
INSTRUCTIONS AND INFORMATION
It is important that some educational work be done to make our dealers and distributors
cognizant of the necessity for more careful attention to installation, preliminary adjustments
and demonstration of this instrument. Its price is comparable to that of an automobile, which
on delivery receives a complete check with slight adjustments. We consider that such
procedure should be accorded the D 22-1.
Intensive tests are now being conducted in Camden to obviate troubles so far reported.
Special check is being made on turntable "wow", spindle eccentricity, microphonic howl, all
tubes, cabinet finish, pick-up heads and audio quality at low gain. Instruments coming
through distributors should be again thoroughly tested to assure that our tests are taking effect.
Troubles should be promptly reported, giving the usual complete information on serial
number, code number, classification and description of fault.
Cabinet backs are to be installed on all instruments shipped to date. A supply of these backs
will be forwarded to each distributor in accordance with his D 22 purchase. Please see that he
carries out the operation of getting them installed.
Reference should be made to letters 7.6B and 3.156B. A supply of the improved 6L7 is on
hand at all District Offices.
Improvement of quality on phono reproduction may be gained by adding a 80 mmfd capacitor
from terminal #4 to #6 on the input pack.
W.J. Zaun
Installation and Service
Camden, New Jersey.
