1930-12-11 — Page 2

HONG KONG DAILY PRESS, THURSDAY. DECEMBER 11, 1930.

RADIO

FEATURES

NEW RADIO VALVES WANTED.

“SENSATION" TUBE AT BERLIN EXHIBITION.

VALVES THAT MAKE CHEAP SETS POSSIBLE.·

Is it not time some alteration in the design of valves was made in order to allow radio' receivers to be considerably reduced in price.

The suggestion is that the time the unusual arrangement of the has come to introduce an shtirely electrodes. The "grid" is not fresh strain into the valve family.mounted inside the glass bulb as Something different from the typesual, but is in the form of a metal with which we are familiar. Not Sm or coating deposited in the anything so fantastic as the cold outer surface of the bulb. emitter or the "photo electric." No, there are other novelties iui valves.

The Loewe Value,

The Loowe valve is now being designed on a much simpler plan, which should have the effect of bringing the cost of production still lower. All the plates are assembled Makes Cheap Seta Possible. together as a single ucit, consist The Arcatron" is used eithering of two cylindrical valves, the far detection or low-frequency am- smaller arranged inside the larger. lication. When used as a detec Radial partitions are fixed across For instates, the "sensation" ofer the valve is gas filled and detec. the annular space, between the two the recent Berlin Exhibition was tion takes place as a "lenkago" cylinders, so as to divide it into, the new Arcotron valve-otherwise

say, five separate compartments. known as the Bar valve, so called

The flament and grid of each stage then threaded through the heenuse of its unusual shape-which the signal voltage on the outside are is being introduced by the Tele- grid. No grid-leak or condenser length of each compartment, thus

being necessary. When used for forming five complete sets Junken Co.

A Proullar Type.,

effect between charges set up upon the inner surface of the bulb and

It is different not only in appear.. L.F. amplißention the valve in high-į auce and size, but also in opera-ly exhausted, and the different tion. Last but not least it has been stages are resistance-coupled ie., specially designed for mass produc- the plate of one valve is directly tion, so that it can be sold at a connected to the grid of the next. low price.

All this makes for cheapness, and It is heated directly from thein addition neatness and compact- maina and although the cathode neas--both useful features in any carries 0.2 amp. of raw A.C. current kind of set, but more particularly there is no huro, partly because of in the ease of portables.

The

EVERYTHINGE.C. ELECTRICAL

your guarantee

GECOPHONE

TRADE

B.C. 3049. SCREEN GRID FOUR PORTABLE RECEIVER.

CABINET MODEL, IN SOLID MAHOGANY. An entirely new model incorporating the 'new “STORK" Loud Speaker movement and “HIFLUX" Transformer.

PRICE COMPLETE: £26.0.0

B.C. 3036. SCREEN GRID SHORT WAVE RECEIVER.

THREE: VALVE MODEL.

For wavelengths of approximately 14 to 100 metres. Metal case," finished dark brown crystallino enamel. Incorporates two tuning. condensers with double spaced ranes. A potentiometer is fitted for varying the bias on the detector valvo. A soreon grid valve precode the detector and this enables the set to oscillate easily on all ware hands irrespective of the length of the serial; there are no "blind "apots. By using appropiate coils, this set may bo used on ordinary broadcast wavelengths.

PRIOR £15. 0. 0.

GREATER RANGE AND SELECTIVITY.

HAVE YOU HEARD THESE?

Kore are lots of long-wave and short-wave stations which should be picked up by anyone in Hong Kong who has a mode rately good sot suitable for re- colving such signals. Success in picking up those stations also depends very largely upon fav- ourable atmospheric conditions: Benders are invited to add to this list should they succeed in ploking up any station not in- cluded in either of those lata.

LONG-WAVE STATIONS.

Wave length (Metros) Station

200 Manila

977 Bhanghai

280 Tientsin

310 Shanghai

$20 Peping 345 Tokyo

Call Kilo- Siga cyclo K.Z.I.B. 1,163 K.S.M.8. 1,085 C.R.C. 1,070 K.I.C. 907 C.O.P.K. 3.0.A.R.

353 Hiroshima J.OF.K

945 670

860 840

Y.U.B 640

365 Hong Kong Z.D.W 357 Bombay 361 Sapporo

300

370. Nagoya 370,4

Calcutta

J.0.1.K. 830

J.O.D.K.

JO.C.K.

320

V.U.C 809.9

380 Kumamoto J.O.G.K. 300 Bendal J.O.E.K.

393 Dairen

398 Rangoon

100 Ognki

410 Cantón

413 Manila

SHORT-WAVE STATIONS.

STATION

CALL STOW

60.12 Khabarovsk (Bizia) 67.65 Doblatz (Germany)

81.20 Eindhoven (Holland)P.C.J.

Kro

CYCLES

700

770

J.D.A.K. 760 V.U.R.754

J.O.B.K. 760 C.1.3. 789 K.Z.R.M. 728

Tram (Howo Kona)

or Working

4,434 Mon., Wod.'&-Fri., 0 p.m. & 2.1. 4,090.6-10 p.m.

7,142 Daily 6.80 p.m. & 11 p..

7,310 Not regular

7,730 Daily 11 pm,

8,108 Tuon, & Fri., 9. p.m.l.m. -

1,230 | Not regular

0,503 Not regular

9,020 Fri. 3am., dat. 8 am, & 10 n.m.

9,500 Not regular

· 0,877 | Midnight daily

A.F.K.

B.A.07.

of clec.

60.7 Nauss

A.G.J.

5,201 Not rogular

trodes.

60.

Moscow

E.F.N.

4,000 Tue, Thura, Sat, 8 pm.

43.6

Toms

111.A.

4,896 Sunday midnight

42.

Porth

G.A.G.

41.3

NEW SEASON'S SETS ANALYSED.

Singapore

Y.8.1.4.B.

89.8

Kootwijk (Holland)

P.C.L.

$7.

Bangkok (Sam)

#S.AP.J.

B2.

Sydney

2.B.L.

31.55 Melbourne

SL.O.

31.48 Scheuostads

W.3.X.A.F.

0,630 Daily 0.

$1.28 Sydney

4.F.C.-

81..

Nairobi (Kenya) '.

1.0.0.

28.6

Bydney

IME.

In addition to the new saLSON'I receivers already described in these notes, special mention should be made of an entirely new product manufactured by Messrs. Kolster- Brandes, Ltd.

27,8

Bandoen

PLE

25.58

Chelmsford (England) 5.8.W. '

245

Marila

K.LX.R.

28.38

Scheucctady.

1.2.X.O.

18.88

Bandoeng

P.LAG.

18.4

Kootwijk (Holland)

17.4

Bandoeng

RLF

16.0

Hangkok

16.3

Hootwijk (Holland)

15.74 Bandbong

P.C.K P.LE.

15.6

13.93

Nancy (France) Pittsburg

WS.X.F.

Ar-

This is known as the *K.-B. Pup," a two-valve set at a moderuds price, which incorporates an. cellent loud speaker, but still leaves ample room in its oak cabinet for the accommodation of high and lo tension batterica.

The Pup," a handsome little. sut, is thoroughly well constructed, and carries the usual Kolster- Brandes guarantee of efficiency.

The Greophone range of the General Electric Company's pop- lar receivers has been increased to include a three-valve all-electric A.C. mains set at the price of an ordinary pentable.

Many Stations,

The sot is handsomely housed in black and gold, and with a seTORN. ed-grid Osram valve in the first stage and a pentode in the output stago gives a wide range of statione at full power, combined with great sensitivity and selectivity...

It is an entirely trouble-frie set, and yields results of excep- tional purity and brilliance.

Three new all-electric receivers have been designed for the present" season by the Columbia Grapho phon's Compnay," Ltd."'*-

These include nociel 331, a three- valve pedestal, cabinet set, finished in mahogany or walnut, which is not only an efficient receiver but a handsome and dignified piece of | furnitura fit for any drawing room. -Model 307 has a screened grid detector pentode circuit with Illuminated controls and a' tuning dial calibrated in ware-lengths. This is a table model, and is notable for its great range and volume.

A High-Standard. The third of the new models in a cheaper set intended for the reception of the alternative pro grammes, but it is marked by the same high standard of construction as the costlier models.

The older model; No. 304, tho five- valve set with three scrocamd-grid valves, still maintains its hold on popular favour and retains its position as an instrument for lo expert.

All the models can be supplied

direct current.

P.C.L.

[1.8.1.P.J.

10,520 Not regalar ·

11,020 Midnight 3 am, dally 11,7517.30 pm, & B a.m. daily, except

Saturday and Bunday

12,240 Nightly

12,850 3. Wod., Fri, Sat. 16,102 Daily 0.80 p.m. to midnight 10,304 Daily 7 p..

17.280 Daily 8 p.m. ta'midnight

17,761 Sundays 7 p.m. & midnight 18,404 Each afternoon

10.220 Dally 8.00-7 p.zo.

10,361 Daily 81,m.. 23,640 | Not regular

[Allowance must be made for "summer-time" in most Euro pean countries, which is one hour ahead of trus time.]

MUSIC FROM MANY

UNTRIES

by wireless TELEFUNKEN 40

Long range All-Electric receiver with station selector for use with batteries or lighting mains.

with TELEFUNKEN

LOUDSPEAKER ARCOPHON

For Demonstration and further particulars apply to

SIEMENS CHINA CO.

TELE FUN

KEN

Office Pedder Building, 4th Floor. Showroom-27, Nathan Road, Kowloon,

Canton Office- Shameen. Swatow-Gebr. Roese.

BURGESS

FOR

DEPENDABLE AND DURABLE.

RADIO BATTERY SERVICE.

BURGESS SUPER "B". BATTERIES are made of especially constructed larger cells using refined materials to give maximum capacity Greatly superior to any battery of like dimensions 30 to 50% longer service in radio use

Follow the Experienced Users

and Insist on BÜRGESS.

THEY ARE MADE WITH CHROME."

THE SINCERE CO, LTD.

SOLE DISTRIBUTORS.

AC-SG3 Set

ENTIRELY MAINS OPERATED

A sensation in 8 valva seta, with 1 watt undistorted output; enough power for any moving coil or dynamic loudspeaker, A set that will appeal to you whether you are interested in perfect quality from the local station or clear reception from distant stations.

Price only $145.00

Including Mazla Valos (he best British Valves)

Special B ELIMINATOR for any domestic. set or made to order for any requirements.

For perfect reception

use

MAZDA Valves, large stock newly arrived

BADIO batteries made by now process minimis- ing deterioration “PERTRIX" 160, 100, 60, 45 volte

And C. batteries.

Ebonite "TROLIT" and Pressed Fibre Pancs cut în any size. Loudspeakers, and various parts are also obtainable.

For further information apply to:

TELEFUNKEN CANTON TRADING ASSOCIATION, LTD.

CHINA BUILDING (5TH FLOOR),

LONGEST EXPERIENCE-LATEST DESIGN.

TELEPHONE 24610