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295
Model 648PV
Walnut or Mahogany
rcaVict0R
PROJECTION TELEVISION,
AM-FM
RADIO,
COMRINATION
MODEL 648PTK
Chassis Nos. KCS 24-1, KRS 20-1, KRS 21-1
KRK 1-1, RK-121A and RS-123A
PROJECTION TELEVISION
AM-FM RADIO PHONOGRAPH
COMRINATION
MODEL 848P¥ '
Chassis No. KCS 24A-I, KRS 20-1, KRS 2IA-I
KRK-iA, RK-I2IA and RS-I23B
Mfr. No. 274
Service Data
- 1947 No. 12 -
- 1948 No. T4 -
RADIO CORPORATION Of AMERICA
RCA VICTOR DIVISION
CAMDEN, N. J., U. S. A.
GENERAL DESCRIPTION
Model 648PTK is a forty-eight tube Projection Television,
AM-FM Radio, console combination. The television receiver em¬
ploys four chassis with a total of thirty-five tubes and a five-
inch projection kinescope.
A Reflective Optical System pro¬
vides a 15" x 20" picture on the screen.
Features of the television unit are full thirteen channel cov¬
erage; FM sound system; improved picture brilliance; picture
A-G-C; A-F-C horizontal hold; stabilized vertical hold; two
stages of video amplification; noise saturation circuits; three-
stage sync separator and clipper; four me band width for pic¬
ture channel and reduced hazard high voltage supply.
The radio receiver employs an eight-tube tuner unit and a
four-tube audio-amplifier, power-supply unit.
The radio chassis is provided with a Phono input jack to
permit the use of an external record player.
Model 648PV is .a forty-eight tube Projection Television,
AM-FM Radio, Phonograpn, console combination. The television
receiver employs four chassis with a total of thirty-five tubes
and a five-inch projection kinescope.
A Reflective Optical
System provides a 15" x 20" picture on the screen.
Features of the television unit are full thirteen channel cov¬
erage; FM sound system; improved picture brilliance; picture
A-G-C; A-F-C horizontal hold; stabilized vertical hold;
two
stages of video amplification; noise saturation circuits; three-
stage sync separator and clipper; four me band width for pic¬
ture channel and reduced hazard high voltage supply.
The radio receiver employs an eight-tube tuner unit and a
four-tube audio-amplifier, power-supply unit.
An automatic record changer of the "slicer" type is em¬
ployed and features a crystal pickup with the "Silent Sap¬
phire" stylus.
ELECTRICAL AND MECHANICAL SPECIFICATIONS
TELEVISION R-F FREQUENCY RANGES
Television
Picture
Sound
Tel. Rec.
Channel
Channel
Carrier
Carrier
R-F Osc.
Number
Freq. Me.
Freq. Me.
Freq. Me.
Freq. Me.
1. .44-50. .45.25. .49.75. .71
2
. .54-60. .55.25. .59.75. .81
3. .60-66. .61.25. .65.75. .87
4..
......66-72. .67.25.
.71.75
. .§3
5
. .76-82. .......77.25. .81.75. .103
6. .82-88. .83.25. .87.75....... ..
.109
7......... ....174-180. .175.25. .179.75....... .201
8. ....180-186. .181.25. .185.75..:....
.........307
9
. ....186-192. .187.25. .191.75. ..213
10
. ....192-198. .193.25. .197.75. .219
11.
....198-204. .199.25. .203.75. .225
12
. ....204-210. .205.25. .209.75. .231
13
. ....210-216. .211.25. .215.75. .237
TELEVISION FINE TUNING RANGE
Plus and minus approximately 800 kc on channel 1, and
plus and minus approximately 1.9 me on channel 13.
PICTURE SIZE .....................................15" x 20"
RADIO TUNING RANGE
Broadcast ..... 540-1,600 kc
Short Wave . 9.2-18 me
Frequency Modulation . 88-108 me
Intermediate Frequency—AM . 455 kc
Intermediate Frequency—FM . 10.7 me
RECEIVER ANTENNA INPUT IMPEDANCE..300 ohms balanced
Specifications continued on page 3
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