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1、:+i.f, . . , . : :; lli,:. - ,c; ,. . . , ., ,. RadioFans.CN 收音机爱 好者资料库 world leader in amplifiers, tuners, speakers and kits H. H. Scott has been a leading manufacturer of superb high fidelity components since 1946. During this period Scott has been responsible for the introduction of many new conc
2、epts in both the engineering and design of com- ponents. H. H. Scott produced the first high fidelity am- plifier (in the modern sense of the term). Later, Scott eliminated unsightly wires and tubes by designing the first flat amplifier . bringing high fidelity components from the workshop to the li
3、vingroom. Scott was the first manu- facturer to introduce a successful Wide-Band FM tuner. Scott was first to deliver multiplex adaptors that met the requirements of the FCC approved transmission system. Scott was the first to produce modular tuner-amplifier combinations. For many years, Scott engin
4、eers were investigating the idea of introducing Scott components in kit form for the home builder. However, they felt that the kits then on the market were too uncertain in the hands of amateur kit builders. The wiring diagrams were extremely complex. Alignment and balancing requi1ed special test eq
5、uipment. Kits looked like kits . they were unattractive and bulky. Scott engineers decided to take a brand . new approach. (.J First of all, new components were developed that were foolproof for home builders. Circuitry was devised to make placement of wires and parts less critical. A unique system
6、of FM tuner alignment (called the Ez-A-Line method) eliminated the need for special test instruments. Instruction books were written so that they avoided the pitfalls common to other kits. They were in full color. Only a limited number of steps were described per page, and special Part-Charts were c
7、reated to hold the-parts de- scribed on each page separately, and in the order used. The kit builder need know nothing about engineering to suc- cessfully build Scottkits. Results have been spectacular. Amateurs who never even soldered before report that they have built Scottkits that beat our publi
8、shed specifications in just a few hours. Mag- azine editors and reviewers tell us our specifications are much too conservative. Other manufacturers are paying us the highest compliment of emulating our designs and origi- nal features. There is one thing, however, that cannot be copied. The Scott rep
9、utation for quality, integrity and leadership . . a reputation hard-won by consistent attention to detail . . by continual advance in engineering . by imaginative innovation . by a philosophy that states purchase by the customer marks a beginning . not the end. Our best salesmen are unpaid -our sati
10、sfied customers. RadioFans.CN 收音机爱 好者资料库 i Instructions for the Model LM-35 wideband Multiplex Adaptor Kit Introduction The LM-35 is a wideband demodulator designed to provide superb stereophonic reception when used with any H. H. Scott Wideband tuner. It utilizes the identical multiplex circuitry t
11、hat has made Scott multiplex equipment the standard by which all others are judged. The multiplex sec- tion is mounted on the chassis completely as- sembled, aligned, and tested. During the course of assembly you will be instructed to make cer- tain connections to this preassembled unit. Out- side o
12、f those specified do not make any adjust- ments, bend any coils, or turn any slugs. Any uncalled for changes will adversely affect the performance. Before beginning assembly remove all tubes and put aside for later use. Check the parts On page 24 of this manual is a descriptive list of the parts inc
13、luded. Before beginning the assem- bly it is recommended that you check all the parts with this list. It will insure that there are no miss- ing parts, and will help you become familiar with the various items. If you should accidentally dam- age or misplace any parts, write to the LABORA- TORY KIT S
14、ERVICE DEPARTMENT at the factory immediately. A four foot length of insulated wile has been supplied. It can be used to replace any missing vires or ones accidentally damaged. Simply cut off the length required and strip off of insula- tion at each end. Occasionally we may make minor substitution of
15、 parts. Such substitutions are carefully checked and the parts supplied will work as satisfactorily aa those specified in the manual. These changes will be obvious and are mentioned here only to prevent confusion fn checking the parts list. For example, .005 .f capacitors are used interchange- ably
16、with .0047 .f capacitors. I Tools Required An alignment tool and a small screwdriver are provided. In addition, you will need a pair of long nose pliers, a regular size screwdriver, a pair of wire cutters, and a soldering iron or gun. A 35 watt ( or more) pencil type soldering iron is actu- ally the
17、 easiest to use. The iron should be supplied with a small tip. If a soldering gun is used, it should also have a small tip, and should be used carefully because of the enormous heat it supplies. . . u . . cc!t l QI, Simplified soldering and wiring instructions All the solder needed to assemble the u
18、nit is sup- plied. If for any reason additional solder is needed, make sure that you obtain 60/ 40 ROSIN CORE SOLDER. Under no circumstance should you use Acid Core solder. All guarantees are voided if Acid Core solder is used. RadioFans.CN 收音机爱 好者资料库 I , I 1-IGURE 1 Heres how to solder joints corre
19、ctly: 1. Before using the soldering iron or gun, the tip must be tinned for ease of use. First heat up the iron. Then when the tip is hot, wipe with a cloth till bright and shiny, and apply a generous amount of solder. Remove any ex- cess. Repeat this process for all sides of the tip. 2. Make sure t
20、hat all leads (wires) and termi- nals to be soldered are completely clean. Do not use fluxes or paste of any sort. 3. The leads should be mechanically secure be- fore soldering. This does not mean wrapping leads around the contacts several times. It means a single turn around the contact which is th
21、en pinched tightly with the long nose pliers. If the wire is too large for bending, position the wire so that a good solder con- nection can still be made. (See Fig. 1.) 4. Leads on resistors, capacitors, and similar components are generally much longer than they need to be to make the indicated con
22、- nections. In these cases, the excess leads should be cut off before the part is added to the chassis. In general, the leads should be long enough to reach their termination allow- ing for a little left over to make a good mechanical joint. Sometimes a lead will not seem quite long enough to reach
23、the desired mounting point. In such a case, the terminal lug can be bent slightly to make the connection possible. 5. Place a flat side of the soldering iron tip against the joint to be soldered until it is heated sufficiently to melt the solder. 6. Place the solder against the heated terminal (with
24、 the soldering iron still in contact) and it will immediately flow over the joint. Use only enough solder to thoroughly wet the 2 joint. Too much solder may cause short cir- cuits. The soldering iron does not actually come into contact with the solder, only with the joint. It is the heated joint tha
25、t melts the solder. 7. As soon as sufficient solder has flowed, re- move the solder tube and then a second later, the iron. Use care not to move the leads until the joint has hardened (about 5 seconds). A good solder joint should appear to be bright and shiny. Check the joint for rigidity. If it is
26、not firm and tight, reheat the joint and permit the solder already present to flow again. Sometimes a little more solder will have to be added. 8. When soldering certain of the components, such as diodes, it is advisable to use no more heat than is necessary. Excessive heat can damage these componen
27、ts. 9. Keep the soldering iron clean and bright by occasionally wiping with a rag. The iron does not have to be cooled for this purpose. If you have never done any soldering before, it would be an excellent idea to practice on scraps of wires before beginning. 10. The factory wired parts of your LM-
28、35 can act as a guide to what good soldering looks like. Basic electrical assembly procedure Your adapter kit includes two separate sub- assemblies: the front (,vith all the controls and f knobs), and the main ( with all the tube sockets) . You will construct each sub-assembly separately and then co
29、mbine them to make a complete adap- . ( , t - tor. The Symbol F refers to the front, and M to the main. With the exception of the preassembled multi- plex section, each terminal, tube, transformer, etc. has a code nun1ber (i.e. Tl, V2, and so forth). Every pin on each of these terminals, or tube soc
30、kets is also numbered ( i.e. pin 1, pin 2, and so forth). The instructions will call for a wire to be connected to pin 3, Vl, for exan1ple. Vith the instructions viii be a pictorial, clearly showing the connection to be made and its location. With this information you should experience no diffi- cul
31、ty in making the correct connection. A series of Part-Charts are provided with all the necessary resistors and capacitors mounted. Each chart applies to a particular page of the electrical assembly instructions. For example-in the instructions that follow you will find a page marked Assembly Group B
32、F-2. The B indicates that this is part of the electrical assembly. The F indicates that you will be working on the front. The 2 means that this is the second page of instructions for electrical assembly of the front. In the bag of I, Part-Charts, you will find a Part-Chart BF-2. Take this out and ke
33、ep it next to you when work- ing on this page. The first step on the page is called BF2-1 and refers to a 330K resistor. The first part on the Part-Chart is a 330K resistor. The pictorial on the top of the page will show exactly where this part will go. The part is mounted as directed and the step i
34、s checked off as completed. The many wires used in the adaptor kit are packed in a small plastic envelope. This envelope contains two separate bundles, clearly n1arked. For example -Assembly Group BF-1 involves connecting a group of wires of different colors and lengths. Open the bundle of wires mar
35、ked front, and spread them out near you. The first step, BF-1, calls for a 53/1, orange/white wire. From the orange/white wires select the ones of the appropriate length and hold them up to a ruler. Once you have the correct one, you may proceed as above. IT IS IMPORTANT TO POSITION THE WIRES OR COM
36、PONENTS IN THE SAME POSITION AS SHOWN IN THE PICTORIAL. If the symbol -(S-) appears in the instruc- REGULAR HOOK-UP WIRE MIC LAPEL COLORED VINYL INSULATED BARE (BUSS) FIGURE 2 WIRE 3 tions after any connection, it means that the par- ticular connection with all other wires on the same pin, should be
37、 soldered. After th S will appear a number. This number indicates exactly how many leads or wires are supposed to be con- nected to the termihal or pin in question. For example: connect an orange wire to pin 2, V6 ( S-3) . The soldering number ( S-3) will_. alwys be printed in parenthesis, so it can
38、 be found quickly. It indicates that there should be 3 wires or leads (including the orange one) connected to pin 2, V6, and that all three of. them are to be soldered. This provides an additional check for w1r1ng errors. . Do not solder any connection that is not marked with an ( S-). Other connect
39、ions are yet to be made to this pin before it can be soldered. Fre- quently one end of a lead or component will be soldered while the other end will not (for the moment). The (S-) will only appear after the description of the end that is to be soldered. After completing the soldering, cross out the
40、(S-) sym- bol with your pencil indicating that it has been done. IMPORTANT: Mounted on the chassis of your LM-35 is a prewired and prealigned multiplex unit. This sub-assembly includes many parts that have been carefully positioned to provide precise performance. It also includes many preset ad- jus
41、tments which have been made with special laboratory equipment. DO NOT TURN OR MOVE ANYTHING UNLESS SPECIFICALLY TOLD TO BY THE INSTRUCTION BOOK. FAILURE TO OBSERVE THIS WARNING CAN MEAN SERIOUS DETERIORATION OF PERFORMANCE. Types of Wire Provided Regular hook-up wire -These are the standard insulate
42、d wires that you will be using most of the time. They will be found in bundles for the dif- ferent portions of the assembly procedure. Buss wire-This is a term used to describe short lengths of uninsulated wire. A roll of buss wire will be found in one of the hardware bags. Mic Lapel -This is a type
43、 of cable which has one insulated length and one uninsulated length (ESS) CONDUCTIVE CABLE CONDUCTIVE VINYL IARE (BUSS) SPIRAL METAL CONDUCTIVE SHIELD MATERIAL of buss wire inside. The cable itself has a brightly colored outside insulation. Conductive Vinyl -This is large hollow tubing, usually eith
44、er black or white in color, which has a hollow tube of conductive material inside. Be- tween the outer layer of insulation and the inner layer of conductive material is a single strand of uninsulated buss wire. When using this cable, it is important to prevent the inner conductive mate- rial from be
45、coming exposed and causing a short circuit. Always keep the outer insulation com- pletely over it. Conductive Cable (ESS) This is hollow tubing with a black or white outer insulation and a spiral metal shield inside. Spaghetti -A common name to describe hollow black insulation material. This tubing
46、is slipped over bare wires to provide protection. What to do if you make a mistake No matter how careful you may be, it is still possible to break something accidentally or to cut a lead too short. We might add that if you work when tired, try to do too much, too fast, then the possibility of mishap
47、 increases greatly. Never- theless, it is easy to correct most common errors. 1. Cutting a wire or lead too short -If you cut the wire from one of the components too short you can easily correct it by taking a small piece of uninsulated wire (buss wire) and splicing it on as shown in Fig. 3. If a wi
48、re supplied is damaged, you can cut off a replacement from the 4 feet of spare wire supplied. 2. Breaking a terminal strip -The terminal strips are quite sturdy and will withstand a great deal of handling. Nevertheless, if you are ex- CRIMP .1. piece of black insulation to one end of a 470K resistor
49、* (yellow, purple, yellow). Connect this end to pin 2 (bottom), Pl (S2). BF3-16 Add a . piece of black insulation to one end of a 470K resistor* (yellow, purple, yellow). Connect this end to pin 5 (top), Pl (S2). You have now completed most of the electrical assembly on the front. It is now time to check your work. Take out chart AFl and follovv instructions given on page 17 concerning double checking. You will note that on chart AFl son1e pins have circled numbers next to them. Th
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