Kuzma Stogi S, Instruction Manual

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Page 2: ...INSTRUCTION MANUAL FOR KUZMA TONEARMS S T O G I A N D S T O G I R E F E R E N C E KAT d o o Kuzma Audio Trade Hotemaže 17 a 4205 PREDDVOR SLOVENIA tel 386 4 2535450 fax 386 4 2535454 ...

Page 3: ...ng Force Adjustment 9 D Height VTA Adjustment 10 E Tangentional Cartridge geometry adjustment 11 F Fine VTA Adjustment 15 G Azimuth Adjustment 16 H Bias Adjustment 18 I Fine azimuth Adjustment 19 J Cueing Device Adjustment 19 V GENERAL MAINTENANCE 20 VI MINOR PROBLEMS 21 A Pin Connector Breaks Off from Internal Wiring 21 B Broken Bias Thread 22 C Hum and Buzz 23 VII TRANSPORT AND PACKING 24 A With...

Page 4: ...ith different adjustment The quality bearings are carefully selected and individually checked and tested before assembly They can each support 20 Kg and are mounted free of play with minimal friction in all planes Stogi incorporates a number of extra features including adjustable cueing device removable finger litf precisely calibrated counterweight and simply adjustable bias The arm is wired thro...

Page 5: ... 2 5 x 12 mm and nuts for fixing cartridge plus Allen key 0 7 mm for removing fingerlift 5 Two protractors one for mounting tonearm on turntable and the other for cartridge geometry adjustment 6 Instruction Manual III UNPACKING 1 Remove polystyrene cointainer from box 2 Remove tape from sides and lift top half of polystyrene container marked TOP 3 Remove small polystyrene insert 4 Holding the pill...

Page 6: ... to be sunk It is wise before cutting to hold tonearm in position over marks and judge if position of tonearm on board will be correct bearing in mind these criteria Fig 2 Otherwise precise position of tonearm is unimportant providing it lies on protractor arc The height of tonearm with cartridge mounted is 55 mm above record Fig 2 a 3 Remove tonearm board from turntable 4 Check that thickness of ...

Page 7: ...nt screw in base Fig 6 8 Screw on counterweight so that thread is covered This may take a little time 9 It may now be necessary to adjust the suspension on the turntable due to the added weight of the tonearm 10 Fix tonearm cable onto turntable ensuring that there is adequate cable to allow for height adjustment If turntable has a suspended subchassis position cable in such a way that subchassis h...

Page 8: ..._________________________________________________________________ STOGI STOGI REFERENCE 7 KUZMA ...

Page 9: ...room 3 Using tweezers push the pin connectors into cartridge according to code Red right Green right ground White left Blue left ground The connectors will slip snugly onto pins of the majority of cartridges Fig 10 however If pins are too fat with tweezers firmly push connector onto pin Connector will open slightly Do be careful however that tweezers do not slip and damage cantilever If pins are t...

Page 10: ...in the up position and tube in armrest the counterweight is turned anticlockwise from front view to increase the tracking force As the tonearm is now balanced the position of one dot should be noted and taken as zero any dot will do so choose the moste easily visible Then simply turn the counterweight anticlockwise counting each dot that passes that position as an increased tracking force of 0 1 g...

Page 11: ...the screw in the base while holding the tonearm by the C shape and lifting up Fig 15 6 Tighten screw when tonearm is in position though do not overtighten 7 Repeat process until arm is high enough to clear record 8 Remove stylus guard and put cueing device in play position down The needle should be in the groove If not the tonearm is too high and should be lowered NOTE To ensure needle is properly...

Page 12: ...cord and these points are used when aligning the cartridge In practise these points lie at 66 mm and 121 mm from the record centre see protractor Other protractors make use of different zero points due to the use of different parameters in calculation In this case 60 mm has been chosen as the inner groove and 146 mm as the outer groove which still has optimum tracking distortion Fig 16 For a dista...

Page 13: ...e by observing body of cartridge only HINTS If you have difficulty seeing the cantilever it may help to raise the arm a few mm taking care that the protractor does not rotate This also prevents tilting of the cantilever due to the effect of bias force It may also be helpful to fix the platter by inserting a wedge between platter and plinth and by inserting a sheet of white paper to give a clear ba...

Page 14: ... 5 and 6 above ensuring that the position of the cartridge in the slots alongside is not changed 11 Recheck alignment at point B If cartridge is not aligned here rotate proractor to find where on line x y the cantilever is aligned If it is in front as before but nearer to point B then again pull cartridge slightly forward and repeat by aligning at point A If stylus is further forward on line x y t...

Page 15: ... then at position A Then tighten screws firmly bearing in mind whether the cartridge body is made of metal or plastic NOTE If you find it impossible to align the cartridge ie the cartridge cannot move far enough forward in the slots of the headshell then the tonearm is incorrectly positioned on the armboard being too far from the record centre If the cartridge cannot be moved far enough back in th...

Page 16: ... adjustment of VTA than others The most sensitive profiles are Van Den Hul and Microridge types 1 With felt pen mark the position where the pillar meets the base as a point of reference 2 Use a good recording preferably acoustic instruments and listen If the tonearm is too low the sound has a tendency to have an overblown base and the stereo picture is imprecise If the tonearm is too high the soun...

Page 17: ...are the tube can be rotated slightly to obtain the correct azimuth Firstly the tube should be released by loosening the two screws on the top of the arm Fig 23 Use Allen key 2 5 mm and turn screw for only 90 Then being careful not to push the tube off the armrest insert the Allen key into the screw on the right side of the arm This screw is above the cueing device Observing the position of the mar...

Page 18: ...nd then rotate tube for a similar amount in the opposite direction and again listen Ajudst the arm to the position in which the best sound was obtained In this position make further adjustments by turning the Allen key for a quarter turn in one direction listening and then turning a quarter turn in the other direction and listening Continue this process making ever decreasing adjustments 1 8 of a ...

Page 19: ...ere the tip of the needle sits on the surface rather than in the groove Fig 24 a 1 Set bias and tracking force as previously described and listen to mistracking on highly modulated tracking bands On higher modulated bands mistracking can be heard as impure tones and there will be more overtones See instructions on test record 2 If mistracking is apparent increase or decrease bias until minimum mis...

Page 20: ...just the tracking force This can be done using scales if available or by rotating counterweight back until tonearm is balanced with stylus guard off and applying the required tracking force as previously described IV C Fix counterweight as described Final VTA Correction Once the azimuth has been corrected the VTA should be checked For optimum performance recheck VTA after 30 40 playing hours This ...

Page 21: ...E Ensure that Azimuth and height adjustment screws are fixed before attempting the above Checking Tonearm Bearings for Friction Fig 26 1 Replace stylus guard and balance tonearm with bias at minimum The arm should move slowly and smoothly from the inner groove towards the armrest 2 Add tracking force of 0 1 gram The tonearm should now go slowly down and outwards towards the armrest 3 Balance tonea...

Page 22: ... cartridge 2 Remove insulation plastic from pin connector 3 Insert nail or drill into connector in the way cartridge pins would connect This prevents the connector becoming overheated and also stops solder entering the connector Fix nail in blue tac or other material to hold pin in position 4 Gently pull out about 20 25 mm or wire from tonearm and with sharp knife carefully strip insulation from w...

Page 23: ...roken thread and tie and knot new thread around tube 4 Pull thread through screw as in Fig 28 a and replace screw with Allen key 5 Remove broken thread at point B Fig 28 It may be necessary to pull aside the black plastic slightly to do this 6 Put new thread through and replace black plastic 7 Position tonearm as if in inner groove position and pull thread until rod with weight is in a horizontal ...

Page 24: ...sformer try connecting ground wire to this or to the preamplifier 3 Alternatively connect grounding wire to preamplifier and run another grounding wire from the M C transformer ground to the ground of the preamplifier Hum This can be caused by the transformer in the power amplifier being situated too close to the cartridge or by the tonearm output cable being too close to the mains cable If ...

Page 25: ...t be properly packed for longer transport with the tonearm in position and the tonearm therefore must be removed and repacked in original packing B Packing Fig 29 If desired cartridge can be left in place but a suitable cut will have to be made in polystyrene packing 1 Remove counterweight and put in plastic bag in slot 2 Fold cable so it is shorter than the tube and tie together 3 Put cueing devi...

Page 26: ...nting Tonearm 4 B Mounting Cartridge 7 C Tracking Force Adjustment 8 D Height Adjustment 9 E Tangentional Cartridge Geometry Adjustment 10 F Fine VTA Adjustment 14 G Azimuth Adjustment 15 H Bias Adjustment 17 I Fine Azimuth Adjustment 18 J Cueing Device Adjustment 18 V GENERAL MAINTENANCE 19 VI MINOR PROBLEMS 20 A Broken Pin Connector 20 B Broken Bias Thread 21 C Hum and Buzz 22 VII TRANSPORT AND ...