National Carbon Co. 53 Schematic

National Carbon Co. 53

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Product Information:
Model:53
Manufacturer:National Carbon Co. (Eveready)

Schematic Pages

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

Schematics Content

Page 1:

The R.F. system in the 40 is identical to that in Series 30 Model

In the audio chassis several changes have been made. The power transformer has been replaced by a larger type, which supplies 2.5 volts to filaments or - 45 power tubes and plate voltage necessitates the use of a filter condenser approximately 250 volts to their plates. This increased of larger working voltage rating and also the use of a dynamic speaker field winding of greater resistance so as to correctly drop the high voltage to the proper value for the remaining tubes of the receiver. A smaller value of bias resistor is also required. The dynamic speakers used with Series 40 Receivers employ a 5000 - ohm field coil. The output transformer used to couple the voice coil to the power tubes has a ratio of 25:1. Referring to wiring diagram shown this schematic diagram is that of Series 30. However, a 900 - ohm resistor replaces the one designated as 2339 which is of 1000 - ohm resistance. In all resistagoos such as tube layout and sequence Series 40 is identical to Series 30.

EVEREADY - Series 50 (Screen Grid) Line Voltage 117 - Set on 115 Volt Tap - Volume Control Position Full

Page 2:

Part No. 3515 - Variable resistance in the antennae circuit functions only during the last quarter turn as the volume control is rotated counterclockwise.

Schematic diagram of wiring for Series 50 R.F. Unit as shown on blueprint of WMD 3048 - B.
The following lists are of parts added to and omitted from schematic diagram of R.F. Unit shown on page 41.

Part No. 3515A Variable resistance in the antennae circuit functions only during the last quarter turn as the volume control is rotated counterclockwise.

Schematic diagram of wiring for Series 50 R.F. Unit as shown on blueprint of WMD 3048 - C.
The following lists are of parts added to and omitted from schematic diagram of R.F. Unit shown at top of this page.
Parts Omitted