Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
At least for now, I am going to only scan and
post schematics & parts lists like this one featuring the General Electric Model N-60
6-Tube Auto Superheterodyne radio in graphical format, rather than run OCR on them to separate
the textual content. There are still many people who restore and service these vintage radios,
and often it can be difficult or impossible to find schematics and/or tuning information.
I will keep a running list of all data sheets to facilitate a search.
General Electric
Model N-60 6-Tube Auto Superheterodyne Radio Service Data Sheet
(Maximum power output, 4 W.; tuning range, 530 to 1,650 kc.; iron-core antenna coil; provision
for high- or low-capacity metal tubes; instrument-panel mountings for all popular cars; very
complete filtering.)
The table of voltages for this receiver follows:
*Read with 250,000 ohm meter; **read across the filter choke. The plate. S.-G., and cathode
voltages are all read to ground, while the heater readings are taken directly across the socket
terminals. For aligning the I.F. stage, the lead from the signal generator should be connected
to the stator or the first-detector section of the main tuning condenser, through a 0.05-mf.
condenser. A ground connection must be made to the chassis from the generator. Short out the
oscillator section of the condenser, and set the receiver volume control at maximum position,
adjusting the output of the service oscillator so that it is not high enough to cause the
A.V.C. action of the receiver to take place. Then set trimmers C10, C11, and C13 for highest
output. Turn the set tuning condenser to full-open position and set the service oscillator
for 1,650 kc. If a low-capacity antenna is to be used with the set, connect the antenna lead
to the service oscillator through a 150 mmf. condenser, or through a 0.0015-mf. condenser
if the antenna is of high capacity. Adjust trimmer CC for best output. Set the service oscillator
to 1,400 kc. and turn the receiver tuning condenser carefully for best output, then set CA
and CB for best output. After the receiver is installed in the car it is best to readjust
trimmer CA to match the antenna used. Tune in a weak station around 1,200 kc. on the dial
and with the volume control about three-fourths on, set CA for best results. The dial is set
to the correct frequency calibration by turning a small screw on the back of the control head
after the pilot lamp assembly has been removed. Be sure that the cover of the set is tightly
fitted after it has been removed. It is sometimes necessary to remove paint and dirt particles
that prevent a tight fit in order to stop ignition noise. The receiver is fitted with a universal
control head which can be used on almost any car, by the use of the correct type of escutcheon
plate.
Posted August 27, 2015
Radio Service Data Sheets
These schematics, tuning instructions, and other data are reproduced from my
collection of vintage radio and electronics magazines. As back in the era, similar
schematic and service info was available for purchase from sources such as
SAMS Photofacts, but these printings
were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of
December 28, 2020.
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
