STEREO TUBE POWER AMPLIFIER
Contents
1. 3 NOOO Oo Locate a 6N1P EV V2L Tube On the top left side of the amplifier locate the Tube Socket that has the nomenclature V2L next to it on the chassis Refer to figure 9 Orient the Tube so that the area where no pins are located on the base of the Tube is aligned with the corresponding area on the Tube Socket Carefully insert the Tube into the socket until the base of the Tube is fully seated in the Tube Socket Repeat the above steps for the remaining 6N1P EV V2R Tube Locate a 6N6P V1L Tube On the top left side of the amplifier locate the Tube Socket that has the nomenclature V1L next to it on the chassis Insert the Tube following the same procedures as in steps 3 and 4 9 Repeat the steps 6 9 for the remaining 6N6P V1R Tube ICON rev mar 2005 13 S T INNOVATORS After installation of all tubes follow the steps 1 Orient the ICON so the Back Side is facing you Carefully pull in whole chassis inside the ICON s stainless steel cover 2 Orient the ICON so the Left Side is facing you Using an appropriate screwdriver screw on six screws to the Left Side of ICON 3 Orient the ICON so the Right Side is facing you Using an appropriate screwdriver screw on six screws to the Right Side of ICON 4 Slip on the Power Switch Knob and using an appropriate screwdriver put in the screw into knob 8 Location and Ventilation The ICON can be placed upright on a table or shelf standing o2. 5 S T INNOVATORS 1 General Notes 1 Caution To prevent electrical shock make sure that the AC POWER CORD IS NOT CONNECTED TO THE ICON when inserting or removing Vacuum Tubes as there are hazardous voltages present at the pins of the Tube Sockets 2 Ifthe ICON has been ON please allow the Hot Vacuum Tubes to cool first before removing them 3 For additional connection information refer to the owner s manual s for any component s connected to the ICON 4 Itis very important that loudspeaker cables of adequate size be used so that there will be minimum power loss The size is specified in Gauge Numbers or AWG American Wire Gauge The smaller the Gauge number the larger the wire size Connection Terminals will accept up to a 8 AWG wire size If your loudspeaker cables are 50 feet 38 1m or less use at least 14 Gauge If your loudspeaker cables are 100 feet 76 2m or less use at least 12 Gauge 5 Pin configuration for the XIR Balanced Input connectors on the ICON PIN 1 Shield or ground PIN 2 input PIN 3 input 2 Introduction ICON is an Hl end stereo tube power amplifier with the silky smooth sound and incredible detail that only a tube amplifier can provide Two 100 watt high current output channels will drive any high quality loudspeaker system to its ultimate performance The CON reproduction is sonically transparent and absolutely accurate 3 Why Vacuum Tubes The output level of studio micr
3. Or some sort of dynamic loading factor Tubes sound better because their distortion products are more musical Tubes provide a more appropriate load to transducers Those are the fundamental reasons why tubes sound better ICON rev mar 2005 6 S T INNOVATORS 4 Why Pulse Power Supply Indisputably one of the most important elements in a power amplifier is the power supply PS PS has to supply enough resources of power and has to react fast to the needs of amplifiers electronic What is typical to a tube amplifier s power supplies It is the necessity of many high voltage supplies with corresponding power That is why the power supply transformer is the most whimsical component in a tube amplifier If there is powerful enough and sophisticated power supply transformer it will be with giant size and weight and even more it needs high value capacitors for peak powers To avoid the giant size and weight of power transformer higher value capacitors are needed and a reasonable compromise with the quality The problem resolve is the pulse power supply We set ourselves the task and after two years of working we succeeded to give tubes the necessary pulse power supply module with 9 6 3 totally galvanic separated and synchronized supply voltages The great effort put in work gave brilliant results Notwithstanding the substantial effect of this module on ICON s end price the power amplifier was designed with pulse power supply because correlatio
4. Right Mono Input Note An optional hookup is to use unbalanced cables 2 Prepare the Loudspeaker Hookup Cables one 23 cm 9 05 inch and one 27 cm 10 6 inch Jumper Cables that attach to the ICON Power Amplifier Output Terminals by choosing one of the methods below Bare wire cable ends Carefully remove sufficient insulation from the cable ends If the cable is stranded carefully twist the strands together as tightly as possible Note If desired the twisted ends can be tinned with solder to keep the strands together or attach spade lug and or banana connector Spade lug or prepared wire connection Insert the spade lug connector or prepared section of the cable end into the terminal side access hole and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out Banana plug connection Insert the banana plug into the hole at the top of the terminal Tighten the top portion of the terminal post to secure the banana plug in place Note The use of Banana Plugs is for use in the United States and Canada only 3 Connect the prepared 23 cm 9 05 inch Jumper Cable between two negative Output terminals and the 27cm 10 6 inch Jumper Cable between two positive Output Terminal 4 Connect the Loudspeaker Hookup Cable to the output terminals and being careful to observe the correct polarities Output impedance connections of 2 ohm and 4 ohm are provided If the impedance of your louds
5. that no objects filled with liquids such as vases are placed on the equipment 14 Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the equip ment When a cart is used use caution when moving the cart equipment combination to avoid injury from tip over Connection 15 Connect this equipment only to the type of AC power source as marked on the unit 16 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the equipment 17 Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet ICON rev mar 2005 4 S T INNOVATORS 18 Do not overload wall outlets extension cords or integral convenience receptacles as this can result in a risk of fire or electric shock 19 To completely disconnect this equipment from the AC Mains disconnect the power supply cord plug from the AC receptacle Care of Equipment 20 Clean only with a dry cloth 21 Do not permit objects or liquids of any kind to be pushed spilled and or fall into the equipment through enclosure openings 22 Unplug t
6. turn the screw on the potentiometer so that to turn off the corresponding LED Repeat the above steps for each of the tubes in both channels NOH w N gt Co ICON rev mar 2005 21 S T INNOVATORS 14 Specifications Power Output Stereo Maximum output power per each channel Power Output Mono Parallel Maximum output power Rated Frequency Band Frequency Response Total Harmonic Distortion Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power Sensitivity A Weighted Signal To Noise Ratio Intermodulation Distortion Wide band Damping Factor Input Impedance Output Load Impedance Power Supply Impulse power supply Warm up time Stand by mode Circuit type Output Inputs Vacuum Tubes tubes are military type Control Overall Dimensions Weight 100 W RMS 4 load 100 W RMS 8 load 200 W RMS 4 load 20 Hz to 70 kHz 0 0 25 dB from 20Hz to 20 000Hz 0 3 dB from 10Hz to 70 000Hz 0 456 for 4 or 8 load Stereo 0 596 for 4 ohm load Mono Parallel 0 775 V unbalanced inputs 0 775 V balanced inputs 100 dB 0 5 for 4 or 8 load Stereo Greater than 8 100 unbalanced inputs 200 balanced inputs Terminals for 4 amp 8 O load Stereo 120 V from 100 to 135 V 50 60 Hz at 6 A 230 V from 195 to 260 V 50 60 Hz at 3 A 3 minutes smooth increment of heating voltage Available PPP push pull parallel scheme class AB Balan
7. N rev mar 2005 S T INNOVATORS 11 V4R VER V6R VIR V2R VAR 1 1 LHO Andino 1431 SBA 02e OS GNO O r3 VAL V5L V6L V2L V3L Figure 9 The ICON Chassis has nomenclature screened on it to specify both the circuit location and Tube type for each channel Refer to figure 9 c v DS 88 25 2s o Los St Sri os see o2 2 i Ew XS SES 295 EE Seg pus 885 39839 FES CRE S OF 55 o Q ZSS FE ETS 969 EES 5 5 E Ru do Rey oxo os 2a 5 5 oo N 6 222 Power Output Tubes 1 Orient the Chassis so that the Front Panel of the Amplifier is facing you 2 Locate a GU50 V5L Power Output Tube Refer to figure 9 Screw down the GU50 knob to the top of the tube and pull it from the Tube Box 3 On the top left side of the amplifier locate the Tube Socket that has the nomenclature V5L next to it on the chassis 4 Open the cover of tube holder Refer to figure 10 5 Orient the Tube so that the key on the base of the Tube is aligned with the corresponding key on the Tube Socket 6 Carefully insert the Tube into the socket until the base of the Tube is fully seated in the Tube Socket 7 Screw up the GU50 knob 9 Repeat the above the steps for the remaining 3 Power Output Tubes VAL VAR amp V5R 8 Close the
8. STEREO TUBE POWER AMPLIFIER USER S MANUAL S T INNOVATORS SOFIA 1505 1 TZARICHINA STR TEL 870 21 56 FAX 973 37 27 2 S T INNOVATORS Table of Contents IMPORTANT SAFETY INSTRUCTIONS Eens Gosen ed eN ed eek see a ske ee Se see Ge oe Ge ee ei Pe ee Dee ee bano 3 1 General Notes Ed ee eite t t m ES EE Se N 5 2 rodu eile TRUE EIE 5 3 Why Vacuum Tubes sincere OE FER da Ern 5 4 Why Pulse Power S pply tei e a aee uk 6 5 Performance Features IE EE EE RE SA EE EES SO Eo Lm Ed e Ee E E Vr 6 6 ICON DIMENSIONS ESE ESE SR sd ed ee tete ee RA Ee Ne a tlh GE GN 7 Closed Design dise na eio ei ebur 7 Open Design DIMENSIONS mars IHRE nme a ne eee 8 7 Installatio hor lil SE EER ed SS E Ae Deed no ct 9 General Notes i ec o eret EG ee ME SD ERO E ERUNT ee 9 PowerOutput TUDES EE RE caer EH ER RR 11 Driver TUDES 3 MEMINI M ee DE Ed 12 Indicator TUbeS EE 12 STEMS NK RE EE EE N AE 12 8 Location and VeritilatiOnx Seta EE GE ei iii 19 9 Tubes Connections and Switches location ee ee ee enne 14 10 Howto GonnecttorStereo ss Ee n 15 11 How to Connect for Mono Parallel ees ees ee se ee ee ee ee ee ee RR ee ee ee Re ee ee
9. ced toroidal transformers Balanced amp Unbalanced RCA Input Tubes 2 x 6N1P EV and 2 x 6N6P Driver Tubes 2 x GU19 1 Output Tubes 4 x GU50 Indicator Tubes for output power 2 x EM800 Precise electronic control of Bias mode of the tubes with indication for symmetry and tubes current tuning H x W x D including feet and knob 302 x 465 x 430 mm closed design 261 x 460 x 460 mm open design 24 kg Closed Design 17 kg Open Design ICON rev mar 2005 22 S T INNOVATORS 15 Packing Instructions In the event it is necessary to repack the equipment for shipment the equipment must be packed exactly as described and shown below The ICON Vacuum Tubes must be removed from the Amplifier Tube Sockets and placed into the inside openings of the foam packing material The foam with the tubes located inside are placed into the Amplifier Tube Box and secured to the Chassis Failure to do this will result in damage to the Vacuum Tubes and possibly the ICON Twelve M4x20 mm screws must be used to fasten the unit securely to the Shipping Skid Failure to do this will result in shipping damage Use the original shipping box and interior parts only if they are all in good serviceable condition If a shipping box or any of the interior part s are needed please call or write S T Innovators Shipping Box dd Cover ICON Unit M4x20 12X denen Shipping Box e X Bottom N ICON rev mar 2005
10. cover of tube holder ICON rev mar 2005 12 S T INNOVATORS GU50 cover holder A2 Figure 10 Driver Tubes Locate a GU19 1 V3L Tube 2 On the top left side of the amplifier locate the Tube Socket that has the nomenclature V3L next to it on the chassis Refer to figure 9 Orient the Tube so that the key on the base of the Tube is aligned with the corresponding key on the Tube Socket Carefully insert the Tube into the socket until the base of the Tube is fully seated in the Tube Socket Slip on two cylindrical terminals to the A1 top lead and A2 top lead of the tube Refer to figure 9 Repeat the above steps for the remaining GU19 1 V3R Tube Indicator Tubes Locate an EM800 V6L Tube On the top left side of the amplifier locate the Tube Socket that has the nomenclature V6L next to it on the chassis Refer to figure 9 Orient the Tube so that the area where no pins are located on the base of the Tube is aligned with the corresponding area on the Tube Socket Carefully insert the Tube into the socket until the base of the Tube is fully seated in the Tube Socket Repeat the above steps for the remaining EM800 V6R Tube Small Input Tubes There are two different types of Small Input Tubes 6N1P EV and 6N6P used in each channel Tube type can be found on the outside of the Tube The CON will not function if they are inserted into the wrong socket 1 2
11. ee ee ee ee ne 17 12 How to Operate the ICON Ge rena rena 19 Power On Stand by and OT os oa ia d enel edet ee ea 19 Input ete teta tunt fei 19 13 Setting Wie TS eie festo ER eet 20 14 Specifications m 2 15 Packing InstfuctlOns xoi ese ER BERE EE ME UTE Ur RM GER ER dac 22 ICON rev mar 2005 3 S T INNOVATORS IMPORTANT SAFETY INSTRUCTIONS PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT The lightning flash with arrowhead within an equilateral triangle is The exclamation point within an equi intended to alert the user to the A CAUTION A lateral triangle is intended to alert the RISK OF ELECTRIC SHOCK 3 uni u DO NOT OPEN u resence of uninsulated dangerous ser to the presence of important voltage within the product s enclosure operating and maintenance servicing that may be of sufficient magnitude to AVIS risque DE CHOC ELECTRIGUE NE PASOUVRIR instructions in the literature ac constitute a risk of electric shock to companying the appliance persons WARNING TO REDUCE RISK OF NO USER SERVICEABLE PARTS FIRE OR ELECTRICAL SHOCK DO INSIDE REFER SERVICING TO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE QUALIFIED PERSONNEL To prevent the risk of electric shock do not remove cover or back No user serviceable parts inside General 1 Read these instructions 2 Keep these instructions 3 Heed all warn
12. hazardous voltages present at the pins of the Tube sockels Your ICON has gone through an extensive series of performance tests during the manufacturing process The ICON is supplied with the actual Tubes that were used to test and confirm the performance of this amplifier To protect the Vacuum Tubes from possible shipping damage they are packed in layer of foam and placed into the Tube Box It is secured to the ICON Chassis Note Gloves or a soft cloth will prevent fingerprinting of the Tubes during their installation 1 Using an appropriate screwdriver remove screw from the bottom of Power Switch Knob and pull it from the Front Panel Refer to figure 7 2 Carefully pull out whole wood frame 3 Orient the ICON s chassis so the Front Side is facing you Cut off the support strip from the Tube Box and carefully lift up the Tube Box 4 Orient the Tube Box so the FRONT SIDE is facing you Using an appropriate screwdriver remove four screws from the cover and open the Tube Box Refer to figure 8 5 Remove the first and second layer of foam to expose the Tubes 6 Carefully remove the Tubes from the remaining pieces of foam and temporarily place them in a safe location ICON rev mar 2005 10 S T INNOVATORS GU50 V5L GU50 VAL GU50 VAR GU50 V5R GU19 1 V3L 6N1P EV V2L 6N6P V1L EM800 VEL EM800 VER 6N6P VIR 6N1P EV V2R GU19 1 V3R Tube Box Figure 8 ICO
13. he power cord from the AC power outlet when left unused for a long period of time Repair of Equipment 23 Refer all servicing to qualified service personnel Servicing is required when the equipment has been dam aged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the equipment the equipment has been exposed to rain or moisture does not operate normally or has been dropped 24 Do not attempt to service beyond that described in the operating instructions All other service should be referred to qualified service personnel 25 When replacement parts are required be sure the service technician has used replacement parts specified by S T Innovators or have the same characteristics as the original part Unauthorized substitutions may result in fire electric shock or other hazards 26 Upon completion of any service or repairs to this product ask the service technician to perform safety checks to determine that the product is in proper operating condition Customer Service If it is determined that your S T Innovators product is in need of repair you can return it to your dealer You can also return it to the S T Innovators Service Department For assistance on factory repair return procedure contact the S T Innovators Service Department at S T Innovators Ltd 1 Tzarichina Str 1505 Sofia Bulgaria Phone 359 2 870 21 56 Fax 359 2 973 37 27 ICON rev mar 2005
14. ings 4 Follow all instructions 5 Warning To reduce risk of fire or electrical shock do not expose this equipment to rain or moisture This unit is capable of producing high sound pressure levels Continued exposure to high sound pressure levels can cause permanent hearing impairment or loss User caution is advised and ear protection is recommended when playing at high volumes 6 Caution to prevent electrical shock do not use this polarized plug with an extension cord receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure Attention pour pevenir les chocs elecriques pas utiliser cette fiche polarisee avec un prolongateur une prise de courant ou un autre sortie de courant sauf si les lames peuvent etre inserees afond ans en laisser aucune partie a decouvert 7 Unplug this equipment during lightning storms or when unused for long periods of time 8 Only use attachments accessories specified by the manufacturer Installation 9 The equipment shall be installed near the AC Socket Outlet and the disconnect device shall be easily acces sible 10 Do not block any ventilation openings Install in accordance with the manufacturer s instructions 11 Do not install near any heat sources such as radiators heat registers stoves or other equipment including amplifiers that produce heat 12 Do not use this equipment near water 13 Do not expose this equipment to dripping or splashing and ensure
15. laments to 4 of normal operating voltage Some output distorted will be heard so the source material should be turned off when in standby mode OFF ON Paar fo f f STBY A Figure 15 e Input Switch When BALANCED Input Connections are used place the ICON INPUT Switch to the BALANCED position forward If UNBALANCED connections are used place the INPUT Switch to the UNBALANCED position backward Refer to figure 16 BALANCED BALANCED Figure 16 ICON rev mar 2005 20 S T INNOVATORS 13 Setting the Tubes Bias i 8 U U U U U mu DE u ji ji RR RR q D Lr 1 L1 El AI 1 IUS li El I E m 96 BIAS CURRENT SYMMETRY ro E Co SYMMETRY BIAS CURRENT 88 88 8g 98 g8 38 BB g8 ge vS v3 v3 v2 OUT OUT v2 va va va v5 Figure 17 The output tubes and driver tubes the big ones V3 V4 and V5 need to be biased with a grid
16. n its four feet Adequate ventilation extends the trouble free life of the ICON The suggested minimum space for operating the ICON is 70 cm in width 60 cm in depth and 60 cm in height Always allow air to flow through the ventilation holes on the bottom of the amplifier and a means for the warm air to escape at the top refer to figure 11 y THH one Figure 11 ICON rev mar 2005 14 S T INNOVATORS 9 Tubes Connections and Switches location 7 9 11 24 12 10 8 5 6 3 4 1 2 WO OO Q 14 16 18 20 19 17 15 21 22 23 Figure 12 1 3 GU50 output tubes for right channel 2 4 GU50 output tubes for left channel 5 6 GU19 1 driver tubes 7 8 6N1P EV input tubes 9 10 6N6P input tubes differential amplifier 11 12 EM800 indicator tubes 13 grounding connector 14 15 RIGHT and LEFT outputs connections for loudspeakers 16 17 RIGHT and LEFT balanced inputs for audio cables from a preamplifier or control center audio outputs 18 19 RIGHT and LEFT unbalanced inputs RCA for audio cables from a preamplifier or control center audio outputs 20 Input switch selects between the BALANCED or UNBALANCED INPUTS 21 fuses 6 3A Main Fuse holder refer to information on the back panel of your ICON to determine the correct fuse size and rating 22 Power supply connector Connect the ICON
17. n sound price in this case is incomparably higher 5 Performance Features e Power Output The ICON consists of two separate power amplifier channels each capable of 100 watts into 4 or 8 ohm loudspeakers in stereo It may also be operated in mono at 200 watts into 2 or 4 ohm loudspeakers e Balanced and Unbalanced Inputs Balanced connections guard against induced noise and allow long cable runs without compromising sound quality ICON rev mar 2005 S T INNOVATORS 6 ICON Dimensions The following dimensions can assist in determining the best location for your ICON e Closed Design Dimensions 465 mm E A 3 gt B 3 3 3 PUR 2 Front View of ICON Y Figure 1 Back View of ICON Figure 2 445 mm 430 mm gt Side View of ICON a 340 mm z Figure 3 ICON rev mar 2005 S T INNOVATORS 8 e Open Design Dimensions 460 mm 9 ly 3 3 3 18 3 a IN Front View of ICON NN Figure 4 Back View of ICON Figure 5 460 mm 440 mm Side View of ICON 345 mm Figure 6 ICON rev mar 2005 9 S T INNOVATORS 7 Installation of Tubes Tube Box Dad ICON s chassis Mee Wood frame An enclosure Power Switch g knob Figure 7 e General Notes Caution To prevent electrical shock make sure that the AC POWER CORD IS NOT CONNECTED TO THE ICON when inserting or removing Tubes as there are
18. ophones under typical recording conditions contains peaks far in excess of what VU meters display Everyone knows that but the peaks as measured with an oscilloscope are really high easily exceeding 1 volt The tube or transistor used in a condenser microphone or in a microphone preamplifier often will be driven into severe overload by these peaks The peaks are short so the sound isn t grossly distorted sounding but the distorted peaks do affect what we hear All preamps and condenser mic electronics are overloaded by these peaks but tubes handle it differently than solid state devices When transistors overload in a discrete circuit or in an op amp the dominant distortion product is the third harmonic The third harmonic produces a sound many musicians refer to as blanketed Instead of making the tone fuller a strong third actually makes the tone softer On the other hand with tubes particularly triodes the dominant distortion product is the second harmonic Musically the second is an octave above the fundamental and is almost inaudible yet it adds body to the sound making it fuller Another difference between tubes and solid state devices including FETs is the load they provide to the source This is particularly significant with condenser microphone capsules Even though an FET has input impedance similar to tubes in the megohms for some reason condenser elements just sound better going into a tube Is it input capacitance
19. peakers is in between the available connections use the nearest lower impedance connection WARNING Loudspeaker terminals are hazardous live and present a risk of electric shock 5 Rotate the ICON Power Switch on front panel to the OFF Position and connect the supplied power cord to an active AC outlet ICON rev mar 2005 18 S T INNOVATORS E A onrem To AC Outlet To Loudspeaker 2 or 4 ohm Figure 14 Mono Parallel Connection ICON rev mar 2005 19 S T INNOVATORS 12 How to Operate the ICON e Power On Stand by and Off Rotate the POWER switch to the ON position and sound will be heard from the Loudspeakers when the tubes have reached their operating temperature The amount of time it takes is dependent upon the temperature of the Tubes about 3 min smooth increment of heating voltage Rotate the POWER Switch to the OFF position to stop amplifying the audio signal Refer to figure 15 Standby Mode The ICON amplifier SHOULD NOT BE LEFT RUNNING WHEN NOT IN USE Unlike solid state amplifiers tube amplifiers should be shut down when not being used This will greatly prolong tube life A standby mode has been provided for short term use between listening sessions so that the amp will remain in a warmed up state If you will not be listening to the amplifier for more than an hour it is advised that the amplifier be turned off The standby switch lowers the voltage on the tubes and heater fi
20. power cord to a live AC outlet Refer to information on the back panel to determine the correct voltage 23 Power selector switch 110 or 220 VAC 24 Power Switch 3 positions OFF STBY standby and ON ICON rev mar 2005 15 S T INNOVATORS 10 How to Connect for Stereo Caution The supplied AC Power Cord should not be connected to the Rear Panel of the ICON until after the Loudspeaker Connections have been made Failure to observe this could result in Electric Shock 1 Connect cables from the Balanced Outputs of a preamplifier or control center to the ICON Left and Right Balanced Inputs Note An optional hookup is to use unbalanced cables 2 Prepare the Loudspeaker Hookup Cables that attach to the ICON Power Amplifier Output Terminals by choosing one of the methods below Bare wire cable ends Carefully remove sufficient insulation from the cable ends If the cable is stranded carefully twist the strands together as tightly as possible Note If desired the twisted ends can be tinned with solder to keep the strands together or attach spade lug and or banana connector Spade lug or prepared wire connection Insert the spade lug connector or prepared section of the cable end into the terminal side access hole and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out Banana plug connection Insert the banana plug into the hole at the top of the terminal Tighten the
21. top portion of the terminal post to secure the banana plug in place Note The use of Banana Plugs is for use in the United States and Canada only 3 Locate the Terminal Connection Cover and pass the Loudspeaker Hookup Cables thru the Loudspeaker Cable Openings located near the top of the Terminal Cover 4 Connect the Loudspeaker Hookup Cables to the output terminals that match the impedance of your loudspeakers being careful to observe the correct polarities Output impedance connections of 4 ohm and 8 ohm are provided If the impedance of your loudspeakers is in between the available connections use the nearest lower impedance connection WARNING Loudspeaker terminals are hazardous live and present a risk of electric shock 5 Rotate the ICON Power Switch on front panel to the OFF Position and connect the supplied power cord to an active AC outlet ICON rev mar 2005 16 S T INNOVATORS Q Q From Preamplifier To AC Outlet To Right To Left Loudspeaker Loudspeaker 4 or 8 ohm 4 or 8 ohm Figure 13 Stereo Connection ICON rev mar 2005 17 S T INNOVATORS 11 How to Connect for Mono Parallel Caution The supplied AC Power Cord should not be connected to the Rear Panel of the ICON until after the Loudspeaker Connections have been made Failure to observe this could result in Electric Shock 1 Connect a cable from the Balanced Outputs of a preamplifier or control center to the ICON Balanced
22. voltage that controls the flow of electrical current through the tube Tube biasing on the CON amplifier has been designed to be both simple and effective On some amplifiers biasing is done for two or more tubes simultaneously With this method the total current flowing through the group of tubes may be correct but the current flow through any individual tube may vary significantly from the optimal value With the CON amplifier the bias is set individually for each tube so that the correct operating point is assured An added benefit to this approach is that should a tube fail prematurely the single tube can be replaced without having to purchase a matched set Use the following procedure to set the tube bias WARNING There are dangerous and potentially lethal voltages inside this amplifier Do not touch any part of the amplifier other than as described below If you are uncertain about any of these instructions please contact to S T Innovators and have them bias the amplifier for you Allow the amplifier to warm up for at least 30 minutes Turn the preamplifier off so that no signal is entering the amplifier Using an appropriate screwdriver remove screw from the bottom of Power Switch Knob and pull it from the Front Panel Unscrew the 6 captive screws from the Face Panel Remove the face panel Locate the trimmer potentiometers labeled BIAS CURENT SYMMETRY and LEVEL Using an appropriate screwdriver slowly
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