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1、LINEAR AMPLIFIER MODEL SB-220 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Assembly and Operation of the LINEAR AMPLIFIER MODEL SB-220 HEATH COMPANY BENTON HARBOR, MICHIGAN 49022 RadioFans.CN 收音机爱 好者资料库 Page 2 -=m TABLE OF CONTENTS INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . .
2、. . . 3 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 STEP-BY-STEP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Circuit Board Prewiring . . . . . . . . . . . . . . . .
3、. . . . . . . . . . 11 Input Coil Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Chassis Parts Mounting . . . . . . . . .
4、 . . . . . . . . . . . . . . . . . 24 ALCWiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Top-Chassis Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Under-Chassis Wiring . . . . . . . . . . . . . . . . . . . . . . . . 46 . . . . . . . . . . . . . . . . . . . .
5、 . . . . 120-240 Volt Wiring 55 Final Top-Chassis Wiring . . . . . . . . . . . . . . . . . . . . . . . 56 Cable Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Knob Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 59 TEST AND FINAL ASSEMBLY . . . . . . . . . . . .
6、. . . . . . . . . . 61 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 OPERATION Controls. Connectors. And Meters . . . . . . . . . . . . . . . . . . . . . 69 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Tune-up . . . . . . . . . . . . . . . . .
7、. . . . . . . . . . . . . . . 71 . . . . . . . . . . . . . . . . . . . . . . . . . . . Periodic Maintenance 74 IN CASE OF DIFFICULTY . . . . . . . . . . . . . . . . . . . . . . . . 75 Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Factory Repair Service . . . . . . . .
8、. . . . . . . . . . . . . . . . . . 77 . . . . . . . . . . . . . . . Special Shipping Instructions for U.S. and Canada 78 . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFICATIONS 79 CIRCUIT DESCRIPTION PowerSupply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Relay . .
9、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 RF Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 ALC Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Metering Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 CIR
10、CUIT BOARD X-RAY VIEW . . . . . . . . . . . . . . . . . . . . . . 85 CHASSIS PHOTOGRAPHS . . . . . . . . . . . . . . . . . . . . . . . . 86 SCHEMATIC . .(fol d.out from page) . . . . . . . . . . . . . . . . . . . . 87 REPLACEMENT PARTS PRICE LIST . . . . . . . . . . . . . . . . . . . 90 INTRODUCTION
11、 The Heathkit Model SP-220 Linear Amplifier is e completely self-contained, table top, grounded grid, linear amplifier. It is designed to operate at the maximum amateur power limit on SSB, C W , and RTTY. Its styling matches the Heath SB series of amateur equipment. The Amplifier is designed to be u
12、sed with exciters which deliver 100 watts o r more output. It can be used with less driving power, but will give a lower output. A broad-band, tuned input circuit for each band feeds the two Eimac 3-5002 triode tubes connected in grounded grid configuration. The tubes are biased beyond cut-off in th
13、e receive1 mode, and zener-regulated bias controls the idling current in the transmit mode. The tubes are cooled by a fan. An ALC circuit develops negative voltage to be fed back to the exciter to reduce its gain when the Amplifier is overdriven. The antenna change-over relay is normally actuated by
14、 exciter relay contacts to place the Amplifier in the transmit mode. The Amplifier can be operated from either 120 VAC or 240 VAC 50/60 Hz lines and can be easily changed from one to the other. Operation from a 240 volt line is recommended. Each side of the line cord is equipped with a circuit break
15、er to protect againstoverloads. An important feature of this Amplifier is that it can be tuned up at the one kilowatt limit and can then be switched to operate on SSB at two kilowatts P.E.P. input. As the switching changes both the voltage and current to the final tubes, the impedance remains the sa
16、me and no additional adjustment of tuned circuits is required. The tubes are instant heating types, and transmission may be started as soon a s the Amplifier is switched on (after Here is a full legal-limit Amplifier that can take its place on your operating table and give you years of troublefree p
17、leasure. This Amplifier has a commanding voice. Read the Kit Builders Guide for complete information on unpacking, parts identification, tools, wiring, soldering, and step-by-step assernbl y procedures. v PARTS PICTORIAL B R O W N u (continued on fold-out from Page 7) PARTS LIST This Parts List cont
18、ains all of the parts used in the assembly To order replacement parts, refer to the Replacement of the kit. Some parts are packaged in envelopes with the Parts Price List and use the Parts Order Form furnished. part number of the contents printed on the outside. Except for the initial parts check, r
19、etain these parts in their Check each part against the following Parts List. The key envelopes until they are called for in the assembly steps. numbers correspond to the numbers on the Parts Pictorial (fold-out from Pages 4 and 7). KEY PART PARTS DESCRIPTION No. No. - Per Kit KEY PART PARTS DESCRIPT
20、ION No. No. - Per Kit RESISTORS CAPACITORS 112 Watt 1 1-9 1 -44 1-18 1-22 1-23 1-24 1-25 1-26 Other Resistors 2 1-8-1 1 -38-1 1000 S 2 (brown-black-red) 2200 S2. (red-red-red) 5600 S2 (green-blue-red) 22 k S 2 (red-red-orange) 27 kS2 (red-violet-orange) 33 k S 2 (orange-orange-orange) 47 kS2 (yellow
21、-violet-orange) 100 k S 2 (brown-black-yellow) 68 k S 2 1 watt (biuegray-orange) 4.7 M S 2 1 watt (yellow-violet- green) .82 S2 wire-wound 2 watt (gray- red-silver) (same size as 1 watt), 5% 1 S 2 wire-wound, 5 watt, 1% 3600 $ 2 wire-wound, 5 watt, 1 % 30 kS2 film, 7 watt Molded Mica 5 20-3 6 20-123
22、 Mica 7 20-99 20- 1 24 20-1 03 20-105 20-1 20 20-1 16 20-1 13 20-1 07 Disc 8 21-79 9 21-14 21 -70 21-31 200 pF (red-black-brown) 500 pF (.0005 pF) .001 pF 6 kV .001 pF 500 volt .O1 pF 1.4 kV .02 pF 500 volt Page 6 KEY PART PARTS No. No. - Per Kit Other Capacitors 10 2i-28 I CONTROLS-SWITCHES DESCRIP
23、TION 10 pF (10 MMF or 10 pyF) tubular ceramic ,001 pF (1000 MMFD) 6 kV, ceramic 20 yF (MFD) electrolytic 200 yF (MFD) electrolytic 437-437 pF ganged variable, 2-section 250 pF variable 100 kS2 control DPST rocker switch DPDT rocker switch 3-position rotary switch 5-position rotary switch Rotary swit
24、ch wafer Circuit breaker TPDT 1 10 VDC relay COI LS-CHOKES-TRANSFORM ERS 80120 plate coil 10115-meter input coil 20-meter input coil 40-meter input coil 80-meter input coil 15/10 plate coil Parasitic choke 1 mH RF choke 8.5 pH RF choke 9 pH RF choke 50 uH RF choke High voltage transformer Filament a
25、nd bias transformer DIODES-TUBES 33 56-24 1 1 N458 silicon diode (yellow- green-gray ) 34 56-26 1 1 N 191 germanium diode (brown-white-brown) 35 56-82 1 1 N3996A zener diode, 5.1V, 10 watt, wlmounting hardware 36 57-27 15 Silicon diode 37 41 1-245 2 3-5002 tube KEY PART PARTS DESCRIPTION No. No. - P
26、er Kit INSULATORS-GROMMETS-TERMINAL STRIPS- CONNECTORS 38 71-2 1 Ceramic feedthrough insulator (disassembled in bag) 39 73-4 1 511 6 grommet 73-3 4 112 grommet 73-2 1 314 grommet 40 75-1 23 1 Line cord strain relief 75-1 24 1 6 x 4-1 12 fish paper insulator 41 75-125 8 Capacitor mounting insulator 4
27、2 255-39 1 6-32 x 1-1 14 tapped phenolic spacer 43 255-42 3 6-32 x 314 tapped phenolic spacer 44 431-14 1 2-lug terminal strip 45 431-10 3 3-lug terminal strip 46 43142 1 5-lug terminal strip 47 431 -20 1 6-lug terminal strip 48 431-13 1 4-screw terminal strip 49 432-137 6 Connector tab (large) kXA3
28、S66 L/c-51-42memW mat I) -. 51 43442 2 Phono socket 52 434-93 2 5-lug ceramic tube socket 53 436-5 2 Coaxial jack 54 438-9 1 Coaxial plug 55 438-12 1 Coaxial plug insert WIRE-CABLE-SLEEVING 89-40 1 Line cord 134-36 2 Phono cable assembly 340-1 1 Bare wire 343-2 1 Coaxial cable, RG-58AlU 343-8 1 Coax
29、ial cable, RG-8lU 344-2 1 Small black stranded wire 344-7 1 Large black stranded wire 344-1 3 1 Blue hookup wire 344-50 1 Black hookup wire 344-5 1 1 Brown hookup wire 344-52 1 Red hookup wire 344-53 1 Orange hookup wire 344-54 1 Yellow hookup wire 344-55 1 Green hookup wire , 344-56 1 Blue hookup w
30、ire (thick insulation) 345-1 1 Large metal braid 345-2 1 Small metal braid 346-4 1 Black sleeving 346-7 2 Clear sleeving (large) 346-29 1 Clear sleeving (small) 56 354-5 6 Cable tie Page 7 KEY PART No. No. - HARDWARE #6 Hardware 57 250-138 58 250-56 59 250-416 60 250-8 61 250-32 62 250-89 63 250-218
31、 64 250-206 65 250-40 66 250-47 67 252-3 68 253-1 69 253-2 70 254-1 71 255-71 PARTS Per Kit #8 Hardware 74 250-43 75 250-137 76 2524 77 254-2 78 25566 79 259-2 #10 Hardware 80 250-188 81 252-30 82 252-31 83 254-3 Other Hardware 84 207-8 85 250-213 86 252-15 87 252-7 88 252-10 89 253-10 90 253-42 91
32、253-19 92 254-4 93 254-9 94 259-25 DESCRIPTION 6-32 x 3/16 screw 6-32 x 114 binder head screw 6-32 x 114 flat head screw #6 x 318 sheet metal screw 6-32 x 318 flat head screw 6-32 x 318 binder head screw 6-32 x 318 phillips head screw 6-32 x 1 1 11 6 screw 6-32 x 1-1 12 screw 6-32 x 2 screw 6-32 nut
33、 #6 fiber flat washer #6 fiber shoulder washer #6 lockwasher 6-32 x 3/4 tapped :metal spacer 6-32 x 1-1 18 tapped spacer #6 solder lug 8-32 x 114 setscrew 8-32 x 318 screw 832 nut #8 lockwasher 8-32.x 1-318 spacer #8 solder lug 10-24 x 1 round head screw 10-24 riut 10-24 wing nut #10 lockwasher Cabl
34、e damp 440 x 5/16 screw 440 nut Control nut Speednut Control flat washer 112 flat washer 314 flat washer Control lockwasher #5 lockwasher #10 double lug KEY PART PARTS DESCRIPTION No. No. - Per Kit Other Hardware (contd.) 95 258-115 1 Brass spring 518 x 5112 96 25410 1 Control solder lug 97 25424 1
35、Long solder lug 98 260-12 2 Plate connector 99 456-16 1 Shaft coupler METAL PARTS MISCELLANEOUS Cabinet Chassis. . Capacitor bank bracket Front panel Rear panel Left side panel Right side panel Angle bracket Plate coil bracket Top rear plate cover Perforated top cover Perforated fan cover RF shield
36、Coil mounting shield Silver plated strip Printed circuit board Black tapered spacer Rubber foot Fan blade Silicone grease Plate amperes meter Multi-meter Fan motor Phenolic shaft Small knob Large knob Danger high voltage label Nameplate Blue and white label Nut starter Parts Order Form Kit Builders
37、Guide Manual (See front cover for part number.) , Solder PARTS PICTORIAL (contd.) Page 8 p r e b=-=*-l Details are used in addition to the Pictorials to illustrate a single step. When you are directed to refer to a certain Pictorial for the following steps, continue using that Pictorial until you ar
38、e referred to another Pictorial for another group of steps. 86 through 89) from time to time to sethe actual positions of wires and components. Lockwashers and nuts will be used with most screws when mounting parts, unless the assembly steps state otherwise. Consequently, the applicable steps will c
39、all out only the size and type of hardware used. For example, the phrase Use 6-32 x 114 hardware means to use 6-32 x 114 screws, one or more #6 lockwashers, and 6-32 nuts. Refer to the Details for the proper installation of hardware. Be sure to position each part as shown in the Pictorials. Follow t
40、he instructions carefully, and read the entire step before performing the operation. As ,the drawings in the Manual may be slightly distorted to When a step directs you to connect an insulated wire, first show all the parts clearly, look at the Chassis Photos (Pages prepare its ends by removing 114
41、of insulation. Page 10 - k - J CIRCUIT BOARD Solder a part or group of parts only when directed. Use 112 On the circuit board, be especially careful not t o cover watt resistoks unless directed otherwise in a step. Each unused holes with solder or bridge solder across foils during resistor will be c
42、alled out by the resistance value (in a, kQ, assembly. Perform the steps in Pictorial 1-1. or MQ) and color code. Capacitors will be called out by the capacitance value and type. START FOR GOOD SOLDERED CONNECTIONS. YOU MUST KEEP THE SOLDERING IRON TIP CLEAN. WIPE IT OFTEN WlTH A DAMP SPONGE OR CLOT
43、H. NOTE: D I O D E S M A Y BE S U P P L I E D I N ANY OF THE F O L L O W I N G SHAPES. THE CATHODE END OF THE D I O D E I S M A R K E D W l T H A B A N D OR 2 A N D S . A L W A Y S P O S I T I O N T H I S END A S S H O W N I N THE P I C T O R I A L . (y/osition the circuit board as shown and install
44、 diodes(#57-27) at D7, D5, D3, Dl, D9, D11, and D13. Make sure all seven cath- ode banded ends are to the () Solder. all leads to the foil and cut off the excess lead lengths. ( d I n s t a l l diodes (#57-27) at D6, D4, D2, D8, D10, D12, and Dl4 with their cathode ends to the ( /) Solder all leads
45、to the foil and cut off the excess lead lengths. (4 CAREFULLY INSPECT ALL DIODES IN THE PRECEDING STEPS TO BE SURE THEY ARE POSITIONED AS SHOWN IN THE PICTORIAL AND ON THE 1 CIRCUIT BOARD. CONTINUE PICTORIAL 1-1 Page 11 = * - - * = * = J CIRCUIT BOARD PREWlRlNG Refer to Pictorial 1-2 for the followi
46、ng steps. From the component side of the circuit board, insert one NOTE: To prepare lengths of hookup wire, as in the end of each of the following wires into the designated hole. following step, cut the wire to the indicated length and Solder each wire on the foil side. remove 114 of insulation from
47、 each end. If the wire is solder to hold the strands together. Unless otherwise stated, V/ sranded, twist the ends tightly and apply a m a m o u n t of ( Connect a 5-114 length of red hookup wire to hole A in the circuit board (S-1 ). hookup wire will mean the small solid-conductor wire supplied in
48、various colors. ( d Connect a 3-314 length of black hookup wire to hole B on the circuit board 6-1). ( / ) Prepare the following lengths of hookup wire: L.- - 5-1 14 red 3-314 black 6-1 12 black 17-112 small black stranded wire 7-112 orange 6-112 yellow 9-112 heavy blue (thick insulation) I 2-314hea
49、vy blue (thick insulation) (,/Connect a 6-112 length of black hookup wire to hole C on the circuit board (S-1 1. ( f 1 Connect a 17-112 length of black stranded wire to hole E on the circuit board 6-1). Connect a 7-112 length of orange hookup wire to hole G on the circuit board 6-1). (d Connect a 6-112 length of yellow hookup wire to hole F on the circuit board (S-1). ( J) Connect a 9-112 length of heavy blue hookup wi
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