Type 7047 lnputuner carries the different

and assembled colored targets

Type 7048 Dial Kit. Dial is of dual edge-lightable lucite (see front cover) and designating TelevislOn, FM and other interesting bands.

tk

The Du Mont lnputuner aligned, pre-calibrated comparison.

Type 7047 comes without tubes but with spring-compression tube shields. It is completely Note ruler for size and ready for instaIlation and operation without further adjustment.

IN

T

ELEVISION engineering and production are vastly simplified by taking advanto,ge of Du Mont "know-how." This wealth of specialized skill comes in two handy packages: First. a complete RF head ready to install and capable of tuning in all standard television and FM channels. Second, tried-tested-perfected cathode-ray tubes in the widest range of sizes and types. The RF head as provided by the Inputuner Package Service offers the following advantages:

First and foremo"t, the Ou Mont Inputuner is the outstanding fea:ure i:l television receivers, All the Ou Mont Telesets' or television receivers, renowr.ed for their superlative performance, incorporate this tuner. Its advantages an widely appreciated by the trade, Television set buyers are soon convinced of the> superiority of continlous tuning, Regardless what telecasting Or FM stati::>:1, may be operating in any locality, the Inputuner is always ready to tune t"Em in without adjustment:; of mechanism or circuits, From the merchandising stand, point the Ou Mont Inputuner is the smart thing, It facilitates sales,

Yet this outstanding feature costs less in the final analysis, One reason for this is that the Inputllner inherently affords coverage of the FM and ot"ler i", teresting bands and thus saves the cost of FM circuits, special dial and alignment elsewhere in the receiver. Another reason is that your Television,FM tuning costs are precisely known, as you have no development costs, This c:ssembly is as easy to install as a speaker or motor. Requires no aligning, adjusting, calibration. A complete unit. No costly headaches,

edge,lightable lucite er interesting bands.

(see front cover) and

• Reliability is one of its outstanding advantages, Employing the lnductuner,' no switching is used. All electrical contacts are inside a single, rugged, protective case of special design, instead of being arrayed on a chassis and subject to the corrosive effects of dust and dirt as well as mechanical displacement. Unreliability of switches was the original reason inspiring the invention of the Inductuner. Proven in thousands of air,borne equipments during the war and refined by manufacturing experience, the Inductuner emerges in this present RF head-end assembly as the ideal television tuner. Our experience shows that the field-service expense on the Ou Mont Inputuner is negligible.

Ease of operation is due to the fact that only ONE KNOB is necessary, Thls thereby replacing the one knob provides both coarse and !ine adjustments, switch and vernier system, Coniinuous tuning will be especially desira'cle when the higher frequency channels 7-13 come into general use, With the Inputuner there will be no difficulty in picking out a desired station,

tk • • • • •

compression tube shields, It is completeiy ut further adjustment. Note ruler for size

WITH OR The hancing

INPUTUNER

Highest class tuning equipment affording maximum economy where television and FM are to be covered. Reliability liurpassing that of finest switching systems. Tuning from 44 to 216 mc without a break. Uniformly high quality reception throughout entire tuning range. Tuning don13with one knob in place of switch and vernier.

•

Dial available in design of I taste, adding to appearance of set.

•

Your assembly costs on the RFb end are known when Inputuner! used.

•

Extreme frequency stability.

•

Covers more than 170 times the cycle range of standard broac band.

leering and production are vastly simplified by ge of Du Mont "know-how." This wealth of .es in two handy packages: First, a complete ,tall and capable of tuning in all standard teletlels. Second, tried-tested-perfected cathode-ray ange of sizes and types. s provided by the Inputuner Package Service dvantages:

,t, the Du Mont Inputuner is the outstanding feature b .1 the Du Mont Telesets' or television receivers, renowr-ed this tuner. Its advantages an performance, incorporate the trade. Television set buyers are soon convinced of the )us tuning. Regardless what telecasting or FM statio:l3 my locality, the Inputuner is always ready to tune thE'm of mechanism or circuits. From the merchandising stand>utuner is the smart thing_ It facilitates sales.

19 feature

costs less in the final analysis. One reason for ner inherently affords coverage of the FM and ot':!er i:lIS saves the cost of FM circuits, special dial and alignment 'iver. Another reason is that your Television-FM tuning )wn, as you have no development costs_ This c:ssembly ~s a speaker or motor. Requires no aligning, adjusting, • unit. No costly headaches.

advantages. Employing the 1nductuner, • All electrical contacts are inside a single, rugged, pro11 design, instead of being arrayed on a chassis and , effects of dust and dirt as well as mechanical displaceswitches was the original reason inspiring the invention 'en in thousands of air-borne equipments during the war rcturing experience, the Inductuner emerges in this present as the ideal television tuner. Our experience shows that 3e on the Du Mont Inputuner is negligible.

The Inputuner tunes continuously from 44 to 216 me without a break. It covers all 13 television channels as well as FM, amateur, aviation, telephone and commercial services within this range. Also, continuous tuning means that various no special adjustments need be made at the factory to accommodate frequency assignments in different localities. Nor is any readjustment necessary in the field, should the receiver be moved from one locality to another. The Inputuner is the universal means in the 44-216 me band.

Performance of the Du Mont Inputuner is demonstrably superior in achievinr; uniformly high quality reception throughout its tuning range despite the fact that it covers more than 170 times the kilocycle range of the standard broadcast band, and operates at 100 times those frequencies.

Better Frequency Modulation performance is obtained by the use of the Inputuner than from the usual extension of standard broadcast technique. The reason is that the Inputuner is basically designed for VHF operation, with greater frequency stability and covering the FM band of 88-108 me in more than one complete turn of its primary motion.

The enables coaxial ference

input circuit of the Inputuner is of low impedance or 73 ohms. Thi3 an efficient antenna match throughout the entire range by means of a cable, characterized by exceptionally low pick-up of man·made interand capacitance disturbances.

f its outstanding

is due to the fact that only ONE KNOB is necessary_ This and fine adjustments, thereby replacing the tern. Continuous tuning will be especially desira':ole when :hannels 7-13 come into general use. With the Inputuner Ity in picking aut a desired station.

For all practical purposes, the Inputuner is drift-free, varying per degree C. throughout the range of 15 to 75 degrees C.

less than

I kc

With the exception of the vacuum tubes employed, the Inputuner is nonmicrophonic. Spring compression shields are supplied as regular equipment 10 minimize any residual microphonic tendency in the tubes themselves.

lth coarse

The Inputuner is availab;e with or wlthout the dial. Handsome dials enhancing the appearance of any set, will be supplied separately when desired.

~UTUNER ; tuning equipment afmum economy where 1FM are to be covered. lrpassing that of finest ;tems. 44 to 216 mc without a

•

;,h quality reception :lUretuning range. with one knob in place i vernier.

•

Extreme frequency stability.

•

Covers more than 170 times the kilocycle range of standard broadcast band.

•

Dial available in design of good taste, adding to appearance of any set. Your assembly costs on the RF headend are known when Inputuners are used.

•

Input circuits of low impedance. One antenna covers all 13 television channels.

•

Non-microphonic except for vacuum tubes. Spring compression shields minimize any residual microphonic tendency in tubes .

• • The Inductuner is manufactured by P. R. Mallory & Co., Inc. Inductuner is the reg. trade-mark of that Company.

• l r

I

J__

TYPE 7047 GENERAL SPECIFICATIONS

3 LEADS' REO WITH BLACK TRACER' B+225 v -250 v. YELLOW' A.G.C. OR GROUNO BLACK WITH YELLOW TRACER: FILAMENT 6.3 v. A.G

ALLOW

I

8·

FOR ~

POINTER CLEARANCE

I

BLUE LEAD' MIXER PLATE 180 v. D.C. MAXIMUM

~'6

• Three vacuum tubes: a 616 grounded-grid input; a 6AK5 mixer; a 616 separate oscillator. •

Overall gain is of the order of 15. Image suppression ratio is of the order of 100. IF ratio of the order of 1.000. BC trap minimizes cross talk in installations near powerful transmitters.

•

Frequency-temperature stability held within approximately I kc per degree C. throughout temperature range of IS to 75 degrees C.

1_____________

I

~~NOHM~'AL ANTENNA CONNECTION

7~-'1

r'

• Inputuner comprises three continuouslytunable circuits: two for bandpass and one for oscillator.

Lf)

===-

"'.!-~

3 MOUNTING HOLES

i

__

TAPPED FOR 6-32 SCREWS

~-

Ia _

11l

e Circuit

operates from a low-impedance or 73-ohm unbalanced line for which an all-band television-FM antenna has been designed. Low-impedance input was chosen to minimize lead-in noise pickup and capacitance charges over the wide 44-216 mc range.

•

Compact assembly. Easy to mount in place. Readily wired to remainder of receiver. Note dimensional drawing above.

•

Oscillator radiation. that would interfere with neighboring receivers, unusually low. Of the order of 1/10 of the value usually encountered.

':'

S For additional technical information you are directed to the technical paper "Inductive Tuning System for FM-Television Receiver," Vol. 23, No.5 of Proceedings of The Radio Club of America. This paper was delivered by Paul Ware of the Allen B. Du Mont Laboratories at a joint meeting of The Institute of Radio Engineers and The Radio Club of America in New York. Reprints will be sent on request.

DU MONT now offers to all

manufacturers and experimenters THE

DUMONT 7he complete Jelemsion -PH input .f)!stem

emuodying the

cA1allory -Ware I N DUe TU N E R* The extraordinory ttllling system now exclusir;e{y used in 011 the neff! /JlIH()AlI'7elesets* The INPUTUNER comes to you complete, calibrated and ready to operate, and requires no further adjustments. '

Motor driven and

model of Du Mont INPUTUNER as used in the Du Mont Westminster Hampshire Te/esets. For general specifications, see back cover.

YOU WILL SAVE TIME AND MONEY BY USING TilE DU MONT DESIGNED INPUTUNER PACKAGE SERVICE

Complete coverage of all signals from 44 to 216 mc. This includes television. FM. amateur. police. aviation and marine broadcasts within these limits. The

Du

Mont

lNPUTUNER

is practically

drift

free

and

inherently

non-

microphonic.

Backed complete

by Du Mont engineering

service.

packaged unit to be installed

loud speaker

the lNPUTUNER comes

ill your receiver

to you as a

design as simply

as a

or transformer.

Submit your problems.

You will be amazed

A letter or the attached

post card will receive

at

the simplicity immediate

and low cost of the lNPUTUNERl

attention.

WHAT ARE THE ADVANTAGES OF THE DU MONT INPUTUNER? The Inputuner tunes continuously from 44 to 216 megacycles without a break-covers television channels as well as FM·, amateur and aviation channels.

all 13

Complete coverage of tbis spectrum is inherent in the design of the 1nputuner. No tuning adjustments are ever required if the set is moved to a new location or if the government changes frequency allocations.

No band· switching Inputuner system.

of any kind is required when tuning from channel to channel lust one simple operation to reach any desired station.

with the

The Du Mont 1nputuner is superior in achieving uniform high quality reception throughout the entire tuning range. This is remarkable in view of the fact that it covers more than 170 times the number of kilocycles ot a standard broadcast receiver.

Reliability of operation is superior to other systems because all electrical contacts are within a single protected case of specialized design, instead of being arrayed on the chassis and subject to deposition of dust and mechanical displacements. Thousands of airborne equipments were fitted with 1nductuners during the war and the present design is the outgrowth of this practical development and manufacturing experience. Paul Ware, who during World War II was in charge of the manufacture of our cathode-ray tubes. osciIlographs and radar. together with his staH stands ready to assist you in solving your television ~nd FM tuning problems.

Manual

tuning

model

of Du Mont For general

INPUTUNER

specifications.

as

used

see back

in cover.

the

Du

Mont

Clifton.

The motor and manual nents.

drive models have identical

The circuit operates from a low impedance

RF circuits and compo-

72 ohm unbalanced

which an all-band te1evision-FM antenna has been designed. ance input was chosen to minimize Three vacuum

tubes are employed.

suppression.

The low imped-

noise over the wide 44 to 216 mc range.

There are three tunable circuits. two lor bandpass a 6/6 separate oscillator.

and one for the osciIlator.

a 6/6 grounded input. a 6AK5 mixer and

AlI performance

characteristics

such as gain. image

and oscillator injection are maintained

bandwidth.

line for

approximately

within a factor of 2:1 throughout the entire 44 to 216 mc range. The overalI Inputuner gain is of the order of 10. while the image suppression ratio on alI of the FM and television channels is of the order Adequate

bandspread

of 100 or better.

on the motor drive model by a pointer

is accomplished

which traverses a slide-rule scale slot in both directions and thus provides 22 in. scale length to cover the range. dial affording

approximately

two of the thirteen

adjacent

a

The manual model has -a duplex disk-

the same

bandspread

television

channels.

distance

between

any

and over 360 degrees

of

rotation for the 88-108 mc FM band. The frequency-temperature degree

centigr:ide

stability

throughout

is held within approximately

the temperature

range

1 kc per

of 20 to 80 degrees

centigrade. For additional

technical information.

entitled "lnductive

Tuning System

you are directed to the technical paper

for FM-Te1evision Receivers:'

delivered

by

our Mr. Paul Ware at a joint meeting of The Institute of Radio Engineers and The Radio Club of America in New York on March 28. 1946. furnished

on request.

We are planning

to have sample

quantities

able during the falI of 1946 and expect delivered

Reprints wiIl be

early in the spring of 1947.

of the Du Mont Inputuner

that production

quantities

availcan be

Ii further information is desired. please

fill in and return the enclosed card.

cAffeu If). :::::buAcut c!-abc'Catc'Ciei, due. Passaic

New Jersey