Pure Oil Corp. 506X
Model: | 506X |
Manufacturer: | Pure Oil Corp. |
Description: | 6D15SW |
Schematics Content
Page 1:
Socket Voltages
Measured with voltmeter having sensitivity of 1000 ohms per volt except where indicated by (*).
Dial and Pointer Drive Cord Arrangement
To string a dial cord, set gang condenser to fully meshed position and use following parts:
114955 Clip on end of cord
117057 Cord (55 inches)
119087 Ring for dial cord
161384 Tension Spring
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ALIGNMENT PROCEDURE
1. Remove chassis and loop antenna from cabinet. Reconnect loop to chassis and space it approximately same distance from chassis as when installed in cabinet.
2. Note that there are four calibrating lines stamped into the metal dial frame. When gang condenser is fully meshed, dial pointer should be in the position indicated by first line at the left. If it is set incorrectly, release pointer clip on dial cord and reposition pointer.
3. Connect an output meter across the speaker voice coil or from plate of 35L6GT tube to B through a .1 Mfd. condenser (see voltage chart for convenient B- connection).
4. Connect ground lead from signal generator to B- through a. 25 Mfd. condenser.
5. Set volume control at maximum volume position and use a weak signal from the signal generator.
APPROXIMATE STAGE GAIN DATA
Be sure A.F. and I.F. stages are accurately aligned before measuring gain. R.F. gains can be measured with a "channel" type instrument containing a tuned and calibrated R.F. amplifier. A vacuum tube voltmeter may be used for audio gain measurements. Observe following precautions:
1. For all gain measurements connect signal generator as shown. Use 600 KC, signal with 400 cycle modulation (use nearby frequency if local station interferes.)
2. For R.F. and I.F. measurements connect negative terminal of a 3 volt battery (two 12 volt cells in series) to A.V.C. lead and positive terminal to B. This provides a definite operating point.
IMPORTANT: Disconnect battery when measuring audio stage gains.
3. Be sure radio is carefully tuned to generator signal (use weak signal for sharp tuning.)
4. When using a "channel" type instrument carefully tune it for maximum output at desired frequency before making measurements.
The R.F. and I.F. stage gains shown below are less than under normal operating conditions due to the use of 3 volts fixed bias in order to establish a definite operating point. Therefore, these values are not intended to indicate the full capability of a stage.