From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Service news bulletin for radio engineers regarding aerials, information binders, and components.
| Identifier | ExFiles\Box 63\2\ scan0302 | |
| Date | 3rd May 1937 guessed | |
| PHILCO SERVICEMAN AND RADIO MANUFACTURERS SERVICE NEWS Page Two used in the Philco All-wave, all-purpose aerial is by the use of a low impedance transmission line. The broadcast signal is picked up on the aerial. It then passes through a step down transformer which is located on the aerial itself. This transformer is connected to the receiver by means of a twisted pair of insulated wires, known as the "transmission line." The low impedance transmission line automatically cancels out any induced interference which may be present in the zone through which it passes. Another transformer at the receiver end matches the line to the receiver. In the case of recent Philco receivers the set transformer is not required as there is an in-built aerial selector which is designed to match the transmission line input. Most receivers require high impedance input at the aerial and earth terminals and will therefore need the set transformer to match up. Some makes, however, require low impedance input and you should try the two transmission wires connected direct to the aerial and earth terminals, if results are not satisfactory when using the set transformer. The noise reducing properties are only a part of the work of this aerial. It is also required to work efficiently on a wide range of wavebands. An ideal aerial would be one which was different for every waveband, and this aerial, to a great degree, reproduces such conditions. The method of doing this is by what is known as "electrical switching." The switching operation which is performed at the receiver automatically locks the aerial and its transformer to resonate over a given waveband by means of coupling. This makes it possible for the aerial to cover all wave-lengths used in an all-wave receiver. To provide an aerial which not only reduces interference but also adjusts itself to the operating waveband is a job in which any good service engineer can take pride. Realise what this aerial can do for your customers: tell them about it and you will soon realise the advantages of service sales. "COMPLETE INFORMATION BINDER" 3rd Edition now sold out The demand for the "Complete Information Binder" can only be described as phenomenal. When the first edition was printed it was thought that it would last for a year or two without a reprint. In actual fact a new edition had to be put in hand a few weeks after the first issue. The Binder has now gone into three editions, which have each been larger than the previous ones, and once again we are unable to give immediate delivery. Revision of all present service bulletins is being pushed through and the 4th edition should be available in about three weeks time. The "Complete Information Binder" has always been supplied at cost, but the cost price of 2s. 6d. was based on the contents not exceeding thirty bulletins. There are now nearly sixty bulletins available and rather than raise the price we have decided to split the information into two parts. Part I. will contain bulletins on sets marketed previous to the end of 1935 and Part II. all those made subsequently. Delivery for the fourth edition will be in about three weeks time and when ordering please specify the part you require and forward cash with order. The fourth edition of the "Complete Information Binder" will be available in the following forms:— Part I. ... 2s. 6d. Part II. ... 2s. 6d. Parts I. & II. ... 4s. 6d. (in one binder) THE R.M.S. OUTDOOR SIGN RISING PRICE OF METAL WILL INCREASE THE PRICE 50 members can still buy at 8s. 6d. We are advised by the manufacturers of the R.M.S. Outdoor Sign that they are unable to accept any more orders at the old price of 8s. 6d. It is only due to the fact that we placed bulk orders for these signs some months ago that the price has been maintained for so long. Now we are down to the last 50 and it is only 50 lucky members who order at once who will be able to buy at the present price of 8s. 6d. Immediately our stock is exhausted we shall be unable to accept further orders except at the new price. This price will be announced in the "Serviceman" immediately it has been fixed, but is likely to be 2s. to 3s. above the present price. BIRTHDAY GREETINGS FROM MEMBERS The Secretary and staff of R.M.S. thank the dozens of members who wrote so many nice things in the form of birthday greetings. As encouragement for those who are eligible for membership but have not yet enrolled we quote an extract from one of the spontaneous letters we received. "Just another birthday greeting from an old member. Hearty congratulations for the way R.M.S. has helped us in the past ... Your service data is excellent and I may add that if hundreds of other engineers only knew what they were missing they would enrol at once." PHILCO SERVICEMAN AND RADIO MANUFACTURERS SERVICE NEWS Page Three " THERE'S A GOOD TIME COMING— " In the title of the popular song of yesterday, we can enthusiastically state that a good time is coming for all members of R.M.S. The reason for this frivolity is that in a few days you will receive your copy of the Spare Parts Catalogue. Don't frown, this is not just an ordinary price list. It has been prepared especially for R.M.S. members at their own request. The catalogue is a book to keep, it contains information helpful to all service engineers, young or old, from the Radio Department of a Multiple Store to Sparks' wooden battery charging-cum service hut. Advice on constructing a service bench and diagrams for wiring it. Uses of the Signal Generator; how to overcome noises that ruin reception. All these are dealt with in the Philco Spare Parts Catalogue. The catalogue has been compiled in an entirely new manner, by men having a wide knowledge of the difficulties with which a service engineer has to contend. Our critics may call it unorthodox—we believe it is what the service engineer needs. The catalogue covers a complete range of parts necessary to do good service work. They are listed with full electrical characteristics thereby enabling members to select guaranteed components for replacement in any make of receiver. One can think of nothing more annoying than a first class service job being "let down" by the use of poor quality parts. You can safeguard against this. Parts that have built 8,000,000. trouble free receivers are something to be proud of. Make sure you consult the Philco range before buying your next stock. We have received abundant evidence in the past that the service engineer has been hampered in his endeavour to do a better job, mainly by the apathy of certain manufacturers who refuse to supply parts at less than the list price to the men they actually depend on to keep up their good name. Happily this position no longer exists for the wise service engineer. As a member of R.M.S. he is able to obtain the finest precision tested parts, at prices enabling him to make a fair profit on his work. In the past we have aimed at giving you information to help you do a better job of work. In pursuance of our policy, we now give you a comprehensive list of trouble-free replacement parts, to help maintain the high reputation we feel sure you are building. Do you make a feature of "Service Sales"? There is a large market for Philco All-wave Aerials, Philco valves, extension speakers, etc., and membership of R.M.S. gives you the key to "Service Sales" of the highest quality components. C.F.P. PERIVALE CALLING CLIPS ON COIL CANS Service engineers may have noticed that there are two kinds of clips used for fixing coil cans to the chassis. By reference to the diagram it will be seen that the type A is removed by pinching the clip with a pair of pliers on the end under chassis. The type B are finger fitting and it is only necessary to pinch the two clips together to remove the can from the chassis. No tools are required for this operation. This type may eventually be used as the standard. SUITABLE FUSE FOR USE IN THE MODELS U-427, U-647, U-1647 In the above models a 2 amp. fuse may be used in the place of the 1 amp. fuse at present fitted. If it is desired to replace with a 2 amp. fuse, part number 45-2121 should be ordered. Do you Know That ? 1—In addition to being the world's largest manufacturer of radio, Philco is the world's largest supplier of parts. 2—The reliability of Philco receivers is dependent on the quality of the individual Philco parts. 3—The tremendous Engineering and Research facilities of Philco are always analysing field reports and testing new parts to give you maximum reliability. 4—The price of these parts is no higher than that of inferior parts. 5—Reliable Service work calls for reliable replacement parts. | ||