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Date: 25/07/03

R.V.R. Elettronica S.r.l. (BO)

VJ8000-TR - R.F. Tube Amplifier

11

FIRST-AID

Personnel engaged in the installation, operation, maintenance or servicing of this equipment are
urged to become familiar with first-aid theory and practices. The following information is not
intended to be a complete first-aid procedure, it is brief and is only to be used as a reference. It is
the duty of all personnel using the equipment to be prepared to give adequate Emergency First Aid
and thereby prevent avoidable loss of life.

Treatment of electrical Burns

1) Extensive burned and broken skin.

a.

Cover area with clean sheet or cloth.
(Cleanest available cloth article).

b.

Do not break blisters, remove tissue, remove adhered particles of clothing, or apply any
salve or ointment.

c.

Treat victim for shock as required.

d.

Arrange transportation to a hospital as quickly as possible

e.

If arms or legs are affected keep them elevated.

NOTE

If medical help will not be available within an hour and the victim is conscious and not vomiting,
give him a weak solution of salt and soda: 1 level teaspoonful of salt and 1/2 level teaspoonful of
baking soda to each quart of water (neither hot or cold). Allow victim to sip slowly about 4 ounces
(half a glass) over a period of 15 minutes. Discontinue fluid if vomiting occurs (Do not give
alcohol).

2) Less severe burns - (1st & 2nd degree)

a.

Apply cool (not ice cold) compresses using the cleanest available cloth article.

b.

Do not break blisters, remove tissue, remove adhered particles of clothing, or apply salve or

ointment.

c.

Apply clean dry dressing if necessary.

d.

Treat victim for shock as required.

e.

Arrange transportation to a hospital as quickly as possible.

f.

If arms or legs are affected keep them elevated.

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Содержание VJ8000-TR

Страница 1: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 1 TECHNICAL AND MANTEINANCE MANUAL VJ8000 TR 8KW Power Triode Amplifier 87 5 108 MHz Manufactured by R V R Elettronica Italy ...

Страница 2: ...AL DESCRIPTION 13 2 1 INTRODUCTION 13 CHAPTER 3 29 EQUIPMENT INSTALLATION 29 3 1 INTRODUCTION 29 3 2 UNPACKING 29 3 3 TUBE INSTALLATION 31 3 4 EQUIPMENT SETTING AT WORK 40 CHAPTER 4 42 TUBE MEASURES CARD CALIBRATION 42 4 1 NOTICE 42 4 2 INTRODUCTION 42 CHAPTER 5 57 MAINTENANCE 57 5 1 SAFETY RULES 57 MAINTENANCE FIRST LEVEL 57 5 2 SAFETY RULES 57 MAINTENANCE SECOND LEVEL 57 5 3 MODULES REPLACING 57...

Страница 3: ...FIG 23 TUBE INSTALLATION REFERENCE VIEW N 5 38 FIG 24 REGULATION RF MHZ 39 FIG 25 MEASURES CARD REFERENCE VIEW 44 FIG 26 MEASURES CARD REPLACING DIAGRAM N_1 45 FIG 27 MEASURES CARD REPLACING DIAGRAM N_2 46 FIG 28 POWER SUPPLIES CONNECTION FOR THE CALIBRATION OF TEST POINT VOLTAGES 51 FIG 29 REPORT MEASURE 55 FIG 30 POWER SUPPLY SOCKET 61 FIG 31 ANODE TENSION TRANSFORMER SOCKET 62 FIG 32 RACK POWER...

Страница 4: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 4 ...

Страница 5: ...cedures to short out capacitors and high voltage points before servicing Any damage to the goods must be reported to the carrier in writing on the shipment receipt Any discrepancy or damage discovered subsequent to delivery shall be reported to R V R within five 5 days from its receipt R V R extends to the original end user purchaser all original manufacturers warranties which are transferable and...

Страница 6: ...nd seal the package perfectly The customer always assumes the risks of loss i e R V R is never responsible for damage or loss untill the package reaches R V R premises For this reason we suggest you to insure the goods for the whole value Shipment must be effected C I F PREPAID to the address specified by R V R s service manager on the authorization DO NOT RETURN UNITS WITHOUT OUR AUTHORIZATION AS...

Страница 7: ...N OTHER WARRANTY 12 24 MONTHS 12 MONTHS The last category is for hardware or accessory items whwre only calendar time is involved An Original Equipment Manufacturer OEM or an authorized Varian Distributor can hold an item in his stock for 12 months and the end user still receiver full warranty As an example warranty code T is for 36 months from the date of the shipment from EIMAC or 24 months from...

Страница 8: ...BES III SAFETY REGULAMENT WARNING The currents and voltages in this equipment are dangerous Personnel must at all times observe safety regulation This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in handling potentially hazardous electrical and electronic circuits It is not intended to contain a complete statement of all safety pre...

Страница 9: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 9 In case of emergency ensure that power has been disconnected ...

Страница 10: ...m warm b Keep them as quiet as possible c Loosen their clothing a reclining position is recommended IF PULSE ABSENT BEGIN ARTIFICIAL CIRCULATION APPROX 80 SEC ONE RESCUER 15 COMPRESSIONS 2 QUICK BREATHS APPROX 60 SEC TWO RESCUERS 5 COMPRESSIONS 1 BREATH LIFT UP NECK PUSH FOREHEAD BACK CLEAR OUT MOUTH IF NECESSARY OBSERVE FOR BREATHING C CIRCULATION TILT HEAD PINCH NOSTRILS MAKE AIRTIGHT SEAL 4 QUI...

Страница 11: ...ent c Treat victim for shock as required d Arrange transportation to a hospital as quickly as possible e If arms or legs are affected keep them elevated NOTE If medical help will not be available within an hour and the victim is conscious and not vomiting give him a weak solution of salt and soda 1 level teaspoonful of salt and 1 2 level teaspoonful of baking soda to each quart of water neither ho...

Страница 12: ...d grid configuration working on the frequency range 87 5 108 MHz This amplifier is able to operate at 8KW output power with a driving power of about 350 W The amplifier has motorized plate load and input tuning and is able to cover the completely frequency range The VJ8000 TR is been projected to use a three phases mains voltage monphase only on request 1 3 TECHNICAL SPECIFICATIONS See as referenc...

Страница 13: ... 86 H Panel Dimension 483 mm 19 W 1645 mm 65 76 H Weight 480 Kg 1056 Lbs Working extreme temperatures from 10 to 50 C Umidity max 90 Without condensing CHAPTER 2 ELECTRICAL DESCRIPTION 2 1 INTRODUCTION This chapter describes accurately the VJ8000 TR electrical components For an easy understanding the equipment is been divided in modules each of them is described completely as follows ...

Страница 14: ...07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 14 FIG 1 FRONTAL VIEW REF DESCRIPTION 1 Protections panel 2 Exciter 3 Driver 4 High Voltage Panel 5 Free panel 1HE 6 Free panel 3HE 7 Free panel 1HE ...

Страница 15: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 15 FIG 2 REAR VIEW REF DESCRIPTION 1 Rear panel 2 Air filter ...

Страница 16: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 16 FIG 3 UPPER VIEW REF DESCRIPTION 1 Output connectors 2 Output air chimney 3 RF output connector 1 5 8 4 Upper panel ...

Страница 17: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 17 FIG 4 HINGED FRONTAL PANEL WITH TELEMETRY ...

Страница 18: ...eset of analog instrument for the measure of the forward and reflected power 6 ENCODER Encoder for telemetry connection optional 7 ENCODER SWITCH Key switch to enable the telemetry optional 8 EMERGENCY PUSH SWITCH Emergency push switch to stop the equipment 9 TUNING KEY SWITCH Key switch to enable the motorized tuning 10 TIME FILAMENT DISPLAY Display for the screening of the pre heating filament t...

Страница 19: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 19 FIG 5 HINGED FRONTAL PANEL WITHOUT TELEMETRY ...

Страница 20: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 20 FIG 6 HIGH VOLTAGE PANEL REF DESCRIPTION 1 Quadripole main switch 2 Service outlet ...

Страница 21: ...W REF DESCRIPTION 1 Plate voltage power supply transformer 2 Rectifier diodes bridge for plate voltage 3 Anti flash resistor for plate voltage 4 Discharge resistor for high voltage capacitor 5 Inductance 6 Plate voltage filtering capacitor 7 Plate Voltage transformer socket 8 Final stage power supply socket ...

Страница 22: ...switch 1 7 High tension solenoid switch 2 8 Soft Star resistor for power filament 9 H T Power supply soft start resistor 10 Three phase input socket mono phase on request 11 H T Power supply soft start resistor 12 Services transformer 13 Electromechanism telemetry card optional 14 Filament transformer 15 T A test amperometric 16 Insulator transformer for filament readings 17 Blower overload cutout...

Страница 23: ... BO VJ8000 TR R F Tube Amplifier 23 14 FIG 9 R F CAVITY FRONTAL VIEW REF DESCRIPTION 1 Threaded bar for motorized tuning 2 Discharger 3 Sliding plane with fingers 4 Plate pipe 5 H T socket 6 Load Capacitor 7 Blower air input 8 Tube Socket ...

Страница 24: ...F Tube Amplifier 24 FIG 10 R F CAVITY FRONTAL VIEW REF DESCRIPTION 1 Plate ring 2 Device to fix on the top part of the tube for the high tension test 3 Blower air input 4 Grid ring 5 Tube Socket Anode contact 6 Tube Socket Cathode contact 7 Load capacitor ...

Страница 25: ...ifier 25 FIG 11 TUNING MOTORIZED MECHANISM VIEW REF DESCRIPTION 1 Sliding plane with 2 Discharger for R F cavity protection 3 Plate capacitor 4 Micro switch for top end position of the sliding plane 5 Micro switch for upper end position of the sliding 6 Theared Bars ...

Страница 26: ...r 26 FIG 12 R F CAVITY TOP VIEW REF DESCRIPTION 1 EIA 1 5 8 flange R F output connector 2 Wattmeter 3 Low pass filter 4 Directional coupler 5 Temperature strobe 3 Output air chimney diameter 100 mm FIG 13 CONNECTORS AND CHOCKS FOR SERVICE SIGNALS CONNECTORS INPUT PLANE ...

Страница 27: ...ifier 27 FIG 14 R F CAVITY LEFT LATERAL VIEW REF DESCRIPTION 1 Electo mechanical side plan 2 Soft start resistor 3 Low pass filter 4 Blower 5 Cavity 6 Tuning motor 7 Pressure Switch 8 Air Outlet for low pass filter 9 OUPUT LOAD motor 10 INPUT LOAD motor 11 R F input ...

Страница 28: ...O VJ8000 TR R F Tube Amplifier 28 FIG 15 R F CAVITY RIGHT LATERAL VIEW REF DESCRIPTION 1 T A test amperometric 2 Insulator transformer for filament reading 2 Filament transformer 3 Air cooling blower 4 By pass capacitor for AC filament input ...

Страница 29: ... necessary equipment are a screwdriver with cross head a soket wrench 7 mm and 10 mm a setscrew wrench M6 M8 Make sure to have a container where put all the screws Remount all screws and to make sure that isn t component outside the appropriate position Then insert the power transformer support into rack to make sure to have removed the screws with the setscrew wernch M6 Now remove the plexiglass ...

Страница 30: ... board protection and to lace the threads of the terminal board see drawings with n 1 key soket wrench M8 n 1 setscrew wrench M6 n 1 screwdriver When the connections are connected reassemble the plexiglas protection and the anterior 9 unities panel close again the other panels and proceed with the valve installation Is advisable close the back panel only before working SCREWS POWER SUPPLY SOCKET M...

Страница 31: ...the tune motors don t works Then switch off again the equipment 5 Loosen the clamp that fixes the PLATE ring and move it to the top limit Fig 20 Then insert the tube and at the same time turn it until the grid ring is perfectly on the fixed socket ring of the cavity To be sure of the correct insertion of the tube is necessary that the GRID 1 contact that is the nearest to the plate is totally inse...

Страница 32: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 32 FIG 16 TUBE INSTALLATION DIAGRAM N 1 ...

Страница 33: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 33 FIG 17 TUBE INSTALLATION DIAGRAM N 2 ...

Страница 34: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 34 FIG 18 TUBE INSTALLATION REFERENCE VIEW N 2 ...

Страница 35: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 35 FIG 19 TUBE INSTALLATION DIAGRAM N 3 ...

Страница 36: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 36 FIG 20 TUBE INSTALLATION REFERENCE VIEW N 3 ...

Страница 37: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 37 FIG 21 TUBE INSTALLATION REFERENCE VIEW N 4 ...

Страница 38: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 38 FIG 22 TUBE INSTALLATION REFERENCE VIEW N 5 ...

Страница 39: ...ove tuning adjusting the distance correspondly to MHz FIG 23 REGULATION RF MHZ height Cm Frequencies Mhz 3 88 3 9 89 4 8 90 5 7 91 6 6 92 7 12 93 7 64 94 8 16 95 8 7 96 9 2 97 9 76 98 10 3 99 10 9 100 11 5 101 12 1 102 12 6 103 13 3 104 13 8 105 14 5 106 15 4 107 16 1 108 TABELLA A FREQUENCIES REFERENCE ...

Страница 40: ...set between four values by internal jumpers on the protection card as described in the protection logic specifications NOTE Pay attention to don t broke the Interlock micro switches that stop the equipment 4 Check with the multimeter that filament current is about 51 5 A 5 Now using the panel multimeter verify that the filament voltage is 7 5V 0 37 Vand that VA is about 5500V If it doesn t work fo...

Страница 41: ...e end of post ventilation and repeat the tuning operations sequence of OUPUT TUNE and OUPUT LOAD for the least output power and consequently of OUPUT TUNE and OUPUT LOAD for the maximum output power increasing gradually the input power in case that increasing driving power increases the input SWR of the VJ8000 adjust the input tuning by OUPUT LOAD and INPUT TUNE for the minimum SWR value 12 Adjust...

Страница 42: ...o proceed to the calibration of the card as described later on Before to proceed to the calibration check on the card if J3 is in short circuit and if it s verified the card is been configured for a tetrode amplifier If the short circuit is on J4 the card is been set for a triode amplifier 4 2 INTRODUCTION To calibrate the measures card for tube amplifiers placed near to mains voltage switch in th...

Страница 43: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 43 N_1 DC ammeter ...

Страница 44: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 44 FIG 24 MEASURES CARD REFERENCE VIEW ...

Страница 45: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 45 FIG 25 MEASURES CARD REPLACING DIAGRAM N_1 ...

Страница 46: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 46 FIG 26 MEASURES CARD REPLACING DIAGRAM N_2 ...

Страница 47: ...e for VJ8000 TR tree phases version with Yu148 tube IA max set to 1 6 A corresponds to 3 9 V on the TP6 test point output In this way if the current exceeds 1 6 A value the protections intervene In the manual there is a table with all input and output voltage of the card IA 2 5 A Ig 500 mA VF 7 VAC If 78 A ROS o RFL 1000 W 4 3 MEASURES CARD ADJUSTING OPERATIONS Adjusting procedure of the card at f...

Страница 48: ...ultimeter with the negative connected to ground and the positive connected to relative test point in according to the value that you want calibrate Because of the various tube type on which can be connected this card can happen that the voltages measured can be both positive and negative but it s always necessary to have a positive voltage on the test point output To obtain this it is necessary to...

Страница 49: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 49 ...

Страница 50: ...ter card verify that the instrument placed on the hinged front panel read correctly If the reading of the multimeter corresponds to preset value verify that the selector is on CAL position and the instrument read the full scale otherwise turn TR10 trimmer to calibrate the instrument Now it s possible to calibrate the measures using trimmers placed on the measures card that correspond to the reques...

Страница 51: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 51 FIG 27 POWER SUPPLIES CONNECTION FOR THE CALIBRATION OF TEST POINT VOLTAGES ...

Страница 52: ...2 5 A 5 2 VDC 500 0 mA I STEP Fluke Misura 5 8 VAC 4000 VDC II STEP Fluke Misura 7 211 VAC 6000 VDC 2 5 A 500 0 mA On the measure card there are n 2 trimmer P18 corresponding to VG1 voltage presence and P19 for VA voltage presence These two trimmers set the thresholds for the VG1 and IA voltage presence on the equipment Once that is been verified the voltages presence the relays are closed to enab...

Страница 53: ...nerate an justable voltage of 3 95 V by trimmer P20 and to measure it on test point TP10 Working on dip switch SW1 it s possible to have the preset tension on the chosen output The correspondence on the dip switch SW1 is the following SW1 Test Point Measure 1 TP8 I Filament 2 TP7 V Filament 3 TP6 I Anode 4 TP5 V Anode 5 TP4 IG2 6 TP3 VG2 7 TP2 IG1 8 TP1 VG1 ...

Страница 54: ...ration of the trimmer P16 proceed as follows 1 Insert the tube in the socket and close again the RF cavity so that is possible to switch on it 2 Place an amperometric clamp so that to include one of the two power supply wires of the filament that are connected to the socket 3 Switch on the equipment and place the selector switch MIN FIL ST BY to FULL FIL position 4 Verify that led FIL 2 is lighted...

Страница 55: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 55 FIG 28 REPORT MEASURE ...

Страница 56: ...50 Ohm P 8 KW By Pass Wattmeter Bird Mod 4715 200 50 Ohm with sample Power Supply HP6002A 0 50 V 0 10 A TABLE F VOLTAGE STABILYZER PARAMETERS Model STM0K9 G codice ST1502 Input Power max 900 VA Input Current max 4 1 A Sensibility adjustable from 0 5 to 5 Input Voltage Variation max 15 Efficiency 98 Stabilizzation with a precision indipendent from load and power factor cosφ Harmonic Distorsion Not ...

Страница 57: ...ube cavity and the air filter The periodicity of this maintenance depends from the working conditions of equipment enviromental temperature the dust level of the air humidity It s advisable to execute a preventive checking each three months and to replace the blowers that has some problems as noise or friction Then at regular period is necessary the replacing of the tube The numbers of the tube li...

Страница 58: ...ews of the internal panel of the RF cavity 3 Loosen the plate ring and raise it until the top position and then fix it in this position 4 Remove the high tension block from the top part of the tube 5 Remove the tube from its socket exerting a perpendicular traction from the base upwards and contemporary turn the tube to right and left side to reduce the frictions 6 To remount the tube executed the...

Страница 59: ...ut reflected power 6 The last operation will be able to cause an increasing of the anode current now act on OUPUT TUNE and OUPUT LOAD commands to obtain the maximum output power readable on the wattmeter Place the DIR REF selector on DIR position Verify that the threshold bar move to internal position of RF cavity each time that we are near to the 108 MHz frequency and to external position respect...

Страница 60: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 60 This section contains circuit diagrams and alyouts of the module which conposing the equipment ...

Страница 61: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 61 FIG 29 POWER SUPPLY SOCKET ...

Страница 62: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 62 FIG 30 ANODE TENSION TRANSFORMER SOCKET ...

Страница 63: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 63 FIG 31 RACK POWER SUPPLY BASE ...

Страница 64: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 64 FIG 32 HIGH TENSION PANEL ...

Страница 65: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 65 FIG 33 ELECTROMECHANICAL PLANE TRIODE ...

Страница 66: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 66 ...

Страница 67: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 67 FIG 34 TUBE AMPLIFIERS PROTECTIONS CARD ...

Страница 68: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 68 HIGH POWER RELAYS CARD ...

Страница 69: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 69 FIG 35 TUNING RELAYS CARD ...

Страница 70: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 70 FIG 36 TELEMETRY INTERFACE CARD ...

Страница 71: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 71 FIG 37 MEASURES CALIBRATION CARD ...

Страница 72: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 72 FIG 38 THERMAL STROBE CONNECTOR ...

Страница 73: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 73 FIG 39 P W R MEASURE CONNECTOR ...

Страница 74: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 74 FIG 40 I2 CBUS CONNECTOR FOR TELEMETRY BOX ...

Страница 75: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 75 FIG 41 PTXLCD CONNECTOR ...

Страница 76: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 76 FIG 42 LOW VOLTAGE CIRCUIT DIAGRAM ...

Страница 77: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 77 FIG 43 THREE PHASES CIRCUIT DIAGRAM ...

Страница 78: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 78 FIG 44 MEASURES AND ALLARMS CIRCUIT DIAGRAM ...

Страница 79: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 79 FIG 45 ELECTRIC SCHEMES ...

Страница 80: ... p a Bo Via del Fonditore 2 2c 40138 Bologna Italy Telephone 39 51 6010506 Fax 39 51 6011104 e mail info rvr it www rvr it Printed and bound in Italy All rights reserved No part of this manual may be reproduced or utilized in any form or by any means electronic or mechanical including photocopying recording ...

Страница 81: ...Date 25 07 03 R V R Elettronica S r l BO VJ8000 TR R F Tube Amplifier 81 or by any information storage and retrieval system without permission in writing from the publisher ...

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