Pathe 851 Schematic

Pathe 851

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Product Information:
Model:851
Manufacturer:Pathe

Schematics Content

Page 1:

LINE VOLTAGE: This receiver is designed for operation on 105-125 Volts; 60 Cycles, Alternating Current (AC) only.

POWER CONSUMPTION INCLUDING RECORD CHANGER: 115 Watts.

TUNING RANGE:
Broadcast Band: 540 to 1650 Kilocycles (182 to 555 Meters)
F - M Band: 87.5 to 108.5 Megacycles (2.7 to 3.4 Meters)

DIAL SCALE: The Dial Scale is calibrated in Kilocycles times in for the Broadcast Band, and in Megacycles for the F - M Band, corresponding to newspaper or periodical listings.

TUBES: The Tubes used, and their functions, are as follows:

12AT7 R - F Amplifier and Mixer (F - M)
6BE6 A - M Converter and F - M Oscillator
6BA6 1st I - F Amplifier (A - M & F - M)
6BA6 2nd IF Amplifier (F - M)

6AL5 F - M Detector
6AV6 A - M Detector, A.V.C. and Audio Amp.
6V6GT Beam Power Amplifier
5Y3GT Rectifier

For the placement of these tubes, refer to the diagram on page 3 of this folder.

INSTALLATION: This receiver is complete in every detail for efficient and immediate operation. The following installation procedure should be followed in setting up the receiver for use:
(1) Remove all packing material.
(2) Examine the tubes on the receiver chassis and be sure that they are firmly in their sockets.
(3) Remove all shipping screws from the receiver and record changer compartments as noted on the attached instruction tags. Failure to remove the shipping screws from the rubber cushioned chassis brackets retaining the receiver chassis in place during shipment, may cause microphonic howl.
(4) Retain all screws and hardware removed from the receiver chassis and record changer for future re-use in shipping.

During the alignment procedure all adjustments should be made under the following conditions:
(A) Line voltage set at 117 Volts A.C. (B) Volume control at maximum position. (C) Tone control set at extreme left position (Treble).
(D) Minimum input from the signal generator. This procedure should be adhered to, otherwise adjustments will be broad, due to the action of the automatic volume control.
Refer to the trimmer and tube location diagram below for trimmer and core locations. Follow the sequence in the alignment chart for proper procedure.

FIG. 1 - FRONT PANEL CONTROLS

FIG. 2 - TUBE AND ADJUSTMENT LOCATION DIAGRAM

Page 2:

ALIGNMENT CHART

Notes
1 - TURN VOLUME CONTROL FULLY CLOCKWISE.
2 - MAINTAIN SIGNAL INPUT LOW ENOUGH TO HAVE LESS THAN 2 VOLTS ACROSS METERS.
3 - UNLESS OTHERWISE NOTED, CONNECT LOW SIDE OF SIGNAL GENERATOR TO CHASSIS.
4 - UNLESS OTHERWISE NOTED, SET VARIABLE CONDENSER TO MINIMUM CAPACITY (MAX. FREQ.)
5 - USE PROPER TOOL FOR SMALL I.F. TRANS. ADJUSTMENTS- I.E., .150 DIA. BAKELITE WITH BLADE .075 THICK.
6 - MAINTAIN 60 CYCLE LINE VOLTAGE AT APPROX. 117 VOLTS,