SOCKET VOLTAGE NOTES
1. Bottom view of Sockets.
2. Voltage measured from Socket Lug to Chassis with an Electronic Voltmeter.
3. Voltage measured with Switch in BC position except where marked with delta (-)
4. = Selector Switch in F.M. position.
5. W.J. = Wiring Junction,
N.C. = No Connection.
* = A.C. Voltage.
6. All Voltages taken at Nominal Operating Volt age 117 V., 60 cycles.
7. Socket Voltage Tolerance + 10 %.

DESCRIPTION
TYPE: Eleven-tube, three-band, Superheterodyne.
FREQUENCY RANGE: Standard Broadcast Band; 540 to 1600 kc. (Selector Switch at AM position). Short-wave Band; 9.45 to 11.9 me. (Selector Switch at SW position). Frequency Modulated Band: 88 to 108 mc., Channels 201 to 300 (Selector Switch at FM position).
INTERMEDIATE FREQUENCY: Standard Broadcast Band and Short-wave Band; 455 kc. Frequency Modulated Band: 10.7 mc.
POWER SUPPLY: 60 cycle a.c. only.
VOLTAGE RATING: 105-125 volts.
POWER CONSUMPTION: 100 watts maximum; 20 watts additional for record changer.
POWER OUTPUT: 10 watts maximum.

NOTE: The above model uses the Model "W156" (Part No. 143833) automatic record changer.
DIAL BULBS: Type 47, 6.3 V., .15 amp.

PUSH BUTTON ADJUSTMENT PROCEDURE

Each of the six push buttons, for automatic tuning, has two adjusting screws by which it may be set to any nearby American broadcast station whose frequency in kilocycles is within the kilocycle range cornered by that button. To gain access to these screws, carefully pull off the push button. To set No. 1 push button to a desired position, proceed as follows:
1. Turn the ANT. ADJUSTING SCREW clockwise until moderately tight, then turn the OSC. ADJUSTING SCREW counter-clockwise until the threaded portion extends approximately 3, inch. Use a small screw-driver and do not exert pressure.
2. Turn the band selector switch to the "AN" position and manually tune in the station to which the push button is to be set. The frequency of the station selected must be between 540 and 900 kilocycles, Carefully adjust the tuning control to the point of clearest reception.
3. Turn the band selector switch to the "AUTO" position and slowly turn the OSC. ADJUSTING SCREW clockwise until the same station is heard. Adjust the screw for maximum volume.
4. Adjust the ANT. ADJUSTING SCREW for maximum volume. NOTE: In localities where the receiver is near the transmitting station, it may be necessary to detune the ant. adjusting screw (but not the osc. adjusting screw) of the push-button slightly to keep the receiver from overloading on this station.
5. Turn the band selector switch from "AUTO" to "AM" and back again to check if the adjustment has been correctly made. There should be no change in tone quality. when switched from one to the other.
6. Place the tab with the call letters of the station, to which the push button has been set, in a celluloid "V" and slide it into the button from the side.
7. The remaining push buttons may be set in a similar manner,

ALIGNMENT PROCEDURE
1. This receiver has been aligned at the factory for best performance, and no attempt should be made to re-align it unless the proper test equipment is available.
2. Turn the tuning condenser to full mesh, against stop, and set the dial pointer at the edge of the clear section of the dial, left of " 55. "
3. Connect an output meter across the voice coil of the speaker (3.2 ohms).
4. Turn the volume control knob to maximum clockwise position and adjust the signal generator output to produce a noticeable output meter reading. Keep the signal generator output as low as possible to prevent excessive AVC action in the receiver.
5. Feed an R.F. amplitude modulated signal modulated 30 % at 400 cycle to the receiver as indicated in the alignment procedure chart. Connect signal generator ground terminal to the chassis of the receiver. When F.M. generator is used, a 30 % modulated signal is equal to a deviation of 22.5 kc.
6. Both bass and treble tone controls are to be set for maximum treble response.
7. When aligning the broadcast band, the build-in loop antenna or a suitable dummy antenna, consisting of a coil with 19.1 u h. inductance shunted with a 66 mmf, capacitor must be used.
8. While aligning the set, the shorting link on the antenna terminal strip should be removed. After alignment replace the link, unless an external antenna is to be used.

ALIGNMENT CHART I NOTES (SCOPE METHOD)

1. Align for peak on output meter.
2. Connect two 100,000 ohm resistors in series and connect these resistors from the No. 2 lug of the 6AL5 to the chassis. Connect an electronic volt meter from the center of these resistors to the shielded lead junction of the 39,000 ohm resistor (98) and the. 002 mfd. condenser, (34). Adjust the ratio detector transformer secondary (C) for zero volts on the electronic voltmeter. Remove the two 100,000 ohm resistors.
3. Connect the electronic voltmeter across the 27,000 ohm load resistor (99) and adjust primary of core (D) of the ratio detector transformer (11) for maximum DC output.
4. Connect output of marker generator across sweep generator output. Connect CRO across the 22,000 ohm resistor (104) in the grid circuit of the second I.F. amplifier.
5. CRO connections same as note 4.
6. For dummy antenna see figure 1.

7. Rock gang condenser if necessary while making adjustment.
8. Tune in signal and adjust for greatest sensitivity by forming FM.R.F. coil.
9. Connect CRO in series with 100,000 ohm resistor to grid (pin 4) of R.F. amplifier and chassis. Remove 7F8 oscillator tube. Connect output of marker generator across output of sweep generator. Adjust (L - M) until pattern and markers approximate figure in alignment chart.
9a. Shunt primary of FM antenna transformer with a 10 ohm carbon resistor and adjust (M) for maximum output. Remove shunt and place it across FM antenna transformer secondary and adjust (L) for maximum output. Remove shunt.
10. Connect BC. dummy loop (Fig. 2) across loop terminals on rear of chassis.

ALIGNMENT CHART II (Using output meter and electronic voltmeter)

ALIGNMENT CHART II NOTES
1. Use an unmodulated signal generator, with approximately 100,000 mv. output.

2. Connect two 100,000 ohm resistors in series and connect these resistors from the No. 2 lug of the 6AL5 to the chassis. Connect an electronic voltmeter from the center of these resistors to the shielded lead junction of the 39,000 ohm resistor (98) and the. 002 mfd. condenser, (34). Adjust the ratio detector transformer secondary (C) for zero volts on the electronic voltmeter, Remove the two 100,000 ohm resistors.

3. Connect the electronic voltmeter across the 27,000 ohm load resistor (99) and adjust the primary of the core (D) of the ratio detector transformer (11) for maximum DC output.

4. Limit output of signal generator so that the reading on the electronic voltmeter will not exceed 4 volts.

5. Shunt the FM antenna transformer primary with a 10 ohm carbon resistor, and adjust the FM antenna secondary trimmer (M) for maximum output meter reading. Transfer the 10 ohm shunt to the secondary of FM antenna transformer. Adjust FM antenna primary trimmer (L) for maximum output meter reading. Remove the 10 ohm shunt resistor.

6. Connect the BC dummy loop antenna across the loop terminals on the rear of the chassis (see Figure 2

REPLACEMENT PARTS LIST - MODEL 9-207M
Figures in first column correspond to figures in Schematic Diagram.

REPLACEMENT PARTS LIST - MODEL 9-207M
Figures in first column correspond to figures in Schematic Diagram.

MEGACYCLES TO CHANNEL NUMBERS
Cross index between frequency calibrations in megacycles on the dial and channel numbers follow:

To find the frequency in megacycles for CHANNEL NUMBERS between those given above, add. 2 megacycle for every whole number added to the CHANNEL NUMBER; for example channel 204 would be 88.7 megacycles and 251 would be 98.1 megacycles.

RECORD CHANGER: See Webster Model 156, Pages RCD. CH. 19-1 through RCD.CH. 19-11