HP 450A User Manual Download

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Summary of Contents for 450A

Page 1: ...HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web Scanned by on line curator Tony Gerbic For FREE Distribution Only ...

Page 2: ...450A AMPLIFIER SERIALS PREFIXED 010 I I PR I NTED 1 61 I 00001 1 i ...

Page 3: ... 00001 1 OPERATING AND SERVICING MANUAL MODEL 450A SERIALS PREFIXED 010 AMPLIFIER Copyright HEWLETT PACKARD COMPANY 1961 ISOI PAGE MILL ROAD PALO ALTO CALifORNIA U S A Printed JAN 1961 ...

Page 4: ...17 Amplifier Adjustments 4 3 4 19 Adjusting VI and V2 Heater Voltage 4 3 4 21 Adjusting Amplifier Gain 4 3 III THEORY OF OPERATION 3 1 4 23 Noise and Distortion Measurement 4 4 3 1 Amplifier Circuit Operation 3 1 V REPLACEABLE PARTS 5 1 3 4 Regulated Power Supply Operation 3 1 5 1 Introduction 5 1 3 6 DC Heater Supply 3 1 5 3 Ordering Information 5 1 LIST OF ILLUSTRATIONS Number Page Number Page 1...

Page 5: ...ortion from 2 cps to 100 kc at rated output and load resistance less than 2 above 100 kc NOISE For 40 db gain For 20 db gain Equivalent to 40 microvolts at input terminals Equivalent to 250 microvolts at input terminals POWER DIMENSIONS WEIGHT ACCESSORIES AVAILABLE 115 230 volts HYfo 50 to 1000 cps ac 50 watts Cabinet Mount 8 5 8 in wide 5 1 2 in high 10 3 4 in deep Rack Mount 19 in wide 5 7 32 in...

Page 6: ... and bottom plate and inspect chassis parts for further damage Re port all damage to the carrier and keep amplifier intact for inspection by carrier and insurer All in struments shipped by the Hewlett Packard Company are insured against shipping damage See Warranty at rear of manual 2 3 ELECTRICAL Electrical inspection consists of testing certain electrical characteristics of the amplifier to dete...

Page 7: ... should becon nected to a grounded ac outlet mounting box to ground the chassis 2 9 POWER LINE VOLTAGE The amplifier is shipped from the factory for operation on 11S volt 2 2 Model4S0A ac power unless otherwise specified The power transformer can be reconnected for use on 230 volt power by connecting its dual primary windings in series as shown on the schematic diagram note 1 After such conversion...

Page 8: ...mplifies this increase and applies it to the grid of V5 causing the impedance of V5 to increase thus instantly and exactly counter acting the original tendency to increase This grid control automatically holds the series regulator cathode voltage constant The high plate resistance of the series regulator tube assisted by amplifier feedback attenuates ripple and stabilizes the output voltage during...

Page 9: ...icrophonics heater cathode leakage etc which may be important in certain circuits Remember that most tube failures occur during the first hundred hours of operation After this period tubes age slowly and should not be replaced prematurely as part of routine maintenance 4 10 LOCATING SHORTS IN POWER CIRCUITS 4 11 Check the amplifier for shorts whenever ap plication of line power causes the fuse to ...

Page 10: ...just R27 proceed as follows a Remove amplifier bottom plate connect ampli fier to power source turn on and allow 3 minute warmup b Measure the dc voltage from the positive termi nal of C7 to chassis This voltage must be 6 3 volts when the line voltage is 115 volts c If necessary adjust R27 to obtain 6 3 volts After a 24 hour run in recheck voltage to see that it has settled d Measure the ac voltag...

Page 11: ...WER SOURCE ADJUSTABLE LINE TRANSFORMER Mode14S0A k Measure the open circuit output voltage from the amplifier If necessary refine the adjustment of Cll so the output level is within 1 2 db of 20 db on the voltmeter m Recheck the 40 db gain at 2 mc If a satisfactory compromise cannot be reached for these high fre quency gain measurements the value of C12 may require adjustment Increasing C12 increa...

Page 12: ...for a dip Reduce setting of the meter range switch as necessary and tune analyzer FREQUENCY and BALANCE controls for a minimum reading The final reading in distortion must be less than 1 If it is higher than this mea sure the distortion in the oscillator output alone which should be less than 0 5 i Disconnect oscillator from amplifier INPUT termi nals and short the input terminals together with a ...

Page 13: ...Section IV Figure 4 3 V7 V6 FI V5 V4 Model 450A CRI VI R6 II C2 CII C4 4 6 Figure 4 3 Top View of Model 450A 00001 1 ...

Page 14: ... Model 450A V4 PI R21 R3C V5 FI V6 V7 R3B R3A Section IV Figure 4 4 R6 R2 VI r CI 00001 1 Figure 4 4 Bottom View of Model 450A 4 7 ...

Page 15: ...ER VI 5654 71 o 180 70V lOOK 1 MEG 220 R8 I 0 101 I 0 147 1001 5001 I I 188V 600K 5 V lL 82K 147 V 70K 195 V 3901 L O O I ex ex C O 0 00 I I 1 MEG 215V lOOK I I 471 195V I I 1001 2200 R82 l80V i2 Oi Figure 4 5 Voltages and Resistances on Tube Sockets and Terminal Boards lOOK 215V 3 6 V o o NC NC NC 390 V ex 147V 70K j _ NC NC J Y 100 K REGULATOR CONTROL V6 6AY6 NC 00 147 V lOOK 80V RECTifiER V4 LI...

Page 16: ...0UF T_ R26 82K 210 V REGULATEO R23 R24 10K 33K R25 NOTE 4 RI6 1500 R28 680 REGULATOR AMPL V6 6AV6 DC8a r 20UF R21 500 V2 C8A I 20UF 390V 6 3 V RECTIFIER V4 5Y3GT 2 3 325 V RMS 325V RMS 6 3 RMS V5 V6 TI BLACK GREEN BLACK BLACK YELLOW BLACK REO 115V 115V IFUSEI FI S2 RO I 0 I o NOTE I FOR OPERATION ON 230 VOLT LINES REMOVE 115 VOLT JUMPERS AND AOO 230 VOLT JUMPER NOTE 2 UNLESS OTHERWISE INOICATEO RE...

Page 17: ...uring one year of isolated service are listed in the IRS column of the parts list Circuit Description Mfr TQ RS Ref Stock No C1 Capacitor fixed paper 56289 0160 0018 1 1 22 J Lf 10 400 vdcw 1250 C C2ABC Capacitor fixed electrolytic 00656 0180 0016 2 1 3 sections 10 J Lf sect 450 vdcw C3 Capacitor fixed paper 56289 0160 0017 2 1 22 J Lf 20 400 vdcw C4ABC Same as C2 C5 Same as C3 C6 Capacitor fixed ...

Page 18: ... Not assigned R6 Resistor variable composition 71590 2100 0067 1 1 2500 ohms 20 1 2 W R7 Not assigned R8 Resistor fixed composition 01121 0690 4731 2 1 47 000 ohms 10 1 W R9 Resistor fixed composition 01121 0690 1031 1 1 10 000 ohms 10 1 W R10 Resistor fixed composition 01121 0690 2221 1 1 2200 ohms 10 1 W R11 Same as R1 R12 Same as R2 R13 Resistor fixed composition 01121 0690 2211 1 1 220 ohms 10...

Page 19: ...n 01121 0690 8231 1 1 82 000 ohms 10 1 W R27 Resistor variable wirewound 28480 M 77 1 1 linear taper 10 ohms R28 Resistor fixed composition 01121 0687 6811 1 1 680 ohms 10 1 2 W R29 Resistor fixed composition 01121 0690 1511 1 1 150 ohms 10 1 W Sl 2 Switch toggle 04009 3101 0001 2 1 T1 Transformer power 28480 9100 0016 1 1 V1 2 3 Tube electron 5654 86684 1923 0001 3 3 V4 Tube electron 5Y3GT 86684 ...

Page 20: ...tor binding post 28480 AC 54A 2 0 Insulator binding post single 28480 AC 54D 2 0 Lamp holder for DS1 72765 1450 0022 1 0 Jewel for lampholder 72765 1450 0020 1 0 Shield tube 1 3 811 long 71785 1220 0011 3 0 Refer to II List of Manufacturers TQ Total Quantity used in the instrument RS Recommended spares for one year isolated service for one instrument 5 4 Figure 5 1 Replaceable Parts Sheet 4 of 4 0...

Page 21: ...eland Ohio Paramus N J 70276 70309 70563 70903 70998 71002 71218 71286 71 3 1 3 1 9500 Thom s A Edison Industri Div of McGr w Edison Co West Or nile N J 1 9701 Electr M nuf cturinll Co K ns s City Mo 201 83 Electronic Tube Corp Phil delphi P 2 1 520 F nstool Met llurllic 1 Corp No Chic 1I0 III 21 335 The F fnir Be rinll Co New Brit in Conn 21 964 Fed Telephone nd R dio Corp Clifton N J 24446 Gener...

Page 22: ...Co Chica90 III Allies Products Corp Miami Fla Continental Connector Corp Woodside N Y Leeeraft Mfg Co Inc New York N Y National Coil Co Sheridan Wyo Weckesser Co Chica90 III HU99inS Laboratories Sunnyvale Calif Hi O Division of Aerovo Olean N Y Solar Manufacturing Co Los Angeles Calif Microwave Associates Inc Burlington Mass E cel Transformer Co Oakland Calif Automatic and Precision Mf9 Co CBS Ele...

Page 23: ...sportation charges prepaid by the original purchaser and when upon our examination it is disclosed to our satisfaction to be defective If the fault has been caused by misuse or abnormal conditions of operation repairs will be billed at cost In this case an estimate will be submitted before the work is started If any fault develops the following steps should be taken 1 Notify us giving full details...

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