Noblitt-Sparks Industries, Inc. 341T Schematic

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Product Information:
Model:341T
Manufacturer:Noblitt-Sparks Industries, Inc. (Arvin)
Description:RE-274

Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

FREQUENCY RANGE

Broadcast _ _ _

POWER SUPPLY

POWER OUTPUT
Type: Beam tube
Undistorted _
Maximum _
Plate load _

NoBuTT-sPARKs PAGE 20-5

MODEL 31111'

ELECTRICAL AND MECHANICAL SPECIFICATIONS

__ Output
_ Rectifier

105-125 Volts AC-DC, 35 Watts

LOUD SPEAKER

Type: Permanent magnet

Size: 4 inch

Voice coil impedance __________________ 3.2 ohms

CHASSIS FEATURES

Automatic Volume Control
Underwriters Listed

OPERATING CONTROLS

I. Upper knob __
Tuning ratio
2. Lower knob .___

_ O OFF or Volume

PHYSICAL DIMENSIONS

HOW TO ORDER PARTS

Replacement parts should be ordered by Arvin part number,

REF. PART DEscRuYrIoN

R2 Part e1 (1121042 Resistor, 1 Megoiinr

R4 020060-220 Resistor, 22,000 ohms vs wett

R7 1318537 volnrne control sr sw. 2 rnegoirrns

R10 c20070-222 Resistor, 2,200 ohms 1 wntt

R11 C20060-150 Resistor, 15 ohms 1/. wnn

rnegohrn resistor

C0, (220067-503 condenser. .05 nf, 200 volt

PARTS LIST

REF. PART

_ 61/2 inches
_- 5 inches
__ 4% inches

description and model number of receiver from your Arvin
The Distributor will order direct from the factory, except in the case of tubes,
through regular tube distribution channels.

which should be obtained

DESCRIPTION

Condenser, .002 uf 400 Volt
Condenser, .01 uf 850 Volt Ceramic
Condenser, 40 uf 150 Volt
Condenser, 20 uf 150 Volt
Condenser, 20 uf 25 Volt

Coil Antenna

Coil Oscillator

Coil [F

Output Transformer

Cabinet, Sandel wood

Knob Tuning

Knob Volume

Speaker

Carton with fillers

Line Cord ar Ping Assy
compression spring on Tuning Knob

(C)John F. Rider

Page 2:

PAGE 20-6 `NOBLITT-?PARKS _
MODEL BMT,

ALIGNMENT PROCEDURE

Output meter connection ,_ ...... _.
Output meter reading to indicate 200 mllliwatts (standard output) .
Dummy antenna to be in series with signal generator output
Connection of generator ground lead
Generator modulation . , _ _
i Position of Volume Control __ _
Position of pointer with variab

_ Across loudspeaker voice coil
_ _ 0.8 volts
See chart below
Floating ground
30% 400 cycles
Fully clockwise
. . . 54 on dial

Position Generator Dummy Generator Trimmers Trimmer Approximate
of Frequency Antenna Output Adjuster Function Sensitivity
Variable Connection
Open 455 Kc _05 uf 12SA7 Grid 2 trimmers 1F 3000 uv
(Stator of C-l) on top of T-3
` 1400 Kc 1400 Kc .00005 uf Antenna lug "C-Z Oscillator 360 uv
with Ant. Removed

"Since the antenna section of the variable has no trimmer, the rotor of the variable should be rocked back and forth
on both sides of 1400 Kc while adjusting the oscillator trimmer for maximum output. This is to obtain the combination
of rotor and trimmer setting to give perfect tracking of the two sections of the variable condenser and consequently
give maximum output.

Check sensitivity at 600 Kc. If weak, adjust antenna section plates for maximum output at 600 Kc. Tracking of the
condenser at points other than i400 Kc is accomplished by bending the outside plates on the variable condenser rotor,
which are cut for this purpose. When bending plates to track the condenser at any given frequency, keep in mind the
fact that this will affect the tracking at all frequencies below the point where the plates are bent. A tuning wand is-
very helpful in checking the tracking of this condenser, to indicate whether more or less capacity is needed.

The alignment procedure should be repeated stage by stage in the original order for greatest accuracy.

AltLays keep the output from the test oscillator at its lowest possible value to make the AVC action of the receiver

Locamox 0F Mlm when CHASSIS

oL'rLlNE Fon Tune LAYOUT L

SCHEMATIC CIRCUIT DIAGRAM

IVE

INDICATES /
ammo 'rc
mssls use

(C)John F. Rider

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