Amrad Corporation F 616 Schematic

Amrad Corporation F 616

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Product Information:
Model:F 616
Manufacturer:Amrad Corporation (Crosley)

Schematic Pages

PNG: Page 1 Rider Manual Volume 7
PNG: Page 2 Rider Manual Volume 7

Schematics Content

Page 1:

FIG. 1. WIRING DIAGRAM OF MODEL F - 616

Page 2:

ALIGNMENT PROCEDURE
the circuits in this receiver are very accurately adjusted at the factory and normally should need no further adjustment. However, if it is definitely known that an adjustment is necessary the circuits can best be properly aligned with the use of a modulated signal generator and an output meter.

CONNECTING OUTPUT METER Connect the output meter to the two plates of the 6N6 Oneput Tube. Be sure the meter is protected from D.C. by runnecting a condenser (1 nfd. or larger not electrolytic) in series with one of the leads. 1, Tuning 1 - F Amplifier to 450 Kilocycles.
Connect the output of the signal generator through a 12 mnd. condenser to the top cap of the 6A8 tube, leaving the tube's grid clip in place. Connect the ground lead from the signal generator to the " GND " Terminal of the receiver. KEEP THE GENERATOR LEADS AS FAR AS POSSIBLE FROM THE GRID LEADS OF THE OTHER SCREEN GRID TUBES.
but Set the station selector so that the tuning con denser plates are completely out of mesh. Turn the volume control knob to the right (ON) and turn the lone control knob to the left (TREBLE).
c) Turn the band selector switch to the High Frequency Band,
(d) Set the signal generator to 450 kilocycles.
(e) Adjust both trimmers located on top of the 2nd 1 - F Transformer for maximum output.
(f) Adjust both trimmers located on top of the let I F Transformer for maximum output.
(g) Check operations (e) and (f) for more accurate adjustments.
ALWAYS USE THE LOWEST SIGNAL GENERATOR OUTPUT THAT WILL GIVE A REASONABLE OUTPUT METER READING.

2. Aligning R - F Amplifier,
When aligning the R - F Amplifier the output lead of the signal generator is connected to the " ANT " terminal of the receiver. For the GREEN and WHITE bands &.00025 mld. condenser must be connected in series with the output lead of the signal generator and for the high frequency band a 400 ohm carbon resistor should be used in place of the condenser.
Each band should first be shunt aligned and then ser: ics aligned, where provision is made for series alignment (GREEN band). The band selector switch should he set for the band being aligned and the station selector and signal generator should be set to the frequency indicated (cl for each adjustment.
(a) Adjust the " Osc. " and " ANT " shunt trimmers in the order given for maximum output. Readjust the station selector slightly so that the generator signal is tuned-in with maximum output and then check the adjustments of the " ANT " trimmers, DO NOT READJUST the " OSC " TRIMMER.
NOTE: When shunt aligning the WHITE and RED banda care must be exercised so that the circuits will be aligned on the correct frequency rather than on the image frequency which is approximately 900 kilocycles less than the fundamental. To check on this, increase the output of the signal generator ten times, or more, and try to tune in the signal both at the generator frequency as indicated on the station selector dial and at approximately 900 kilocycles less than the correct frequency. If the circuits have been properly aligned the signal can be tuned-in at both positions but much stronger at the cor rect position.
(b) To align the series trimmer (Ilem 21, Fig. 2) set the signal generator to the frequency indicated (c) and then tune-in this signal with the station selector for maximum output To obtain the best adjustment for the series trimmer it will be necessary to rotate the station selector back and forth slightly while adjusting the trimmer for maximum output.
(c) Signal Input Frequencies:

SPECIFICATIONS
The Amrad Radio Model F - 616 is a six-tube superheterodyne receiver designed to operate on an ALTERNATING CURRENT power supply. It is designed to use either metal tubes or the equivalent glass tubes with

SOCKET VOLTAGES
The tube socket voltages are measured from the tube socket contacts to the changin with a 1000 ohm per volt, 500 volt D.C. voltmeter (except filaments) with the re

Octal bages. If glass tubes are replaced with metal tubes or metal tubes are replaced with glass tubes it will be necessary to completely realign the circuits of the receiver,
It is a three band receiver and the dial is divided into three sections as follows:

Ceiver in operating condition and no signal input. The filament voltages should be measured with an accurate low range AC voltmeter (Approximately 0-10 volts). Readings may vary plus or minus 10 % of valuos given.