Velleman K8010, Manual

Page 1: ...access and service High quality capacitors and components Gold plated input and speaker terminals Standby function Soft start circuit for power transformer Sensitivity adjustment for exact matching o...

Page 2: ...d 2 3 Aranciato Laranja Naranjado Oranssi Orange Orange Orange Orange Orange Orange Oranje 3 4 Giallo Amarelo Amarillo Keltainen Gul Gul Gul Gelb Yellow Jaune Geel 4 5 Verde Verde Verde Vihre Gr n Gr...

Page 3: ...bes approx 1 minute Standby circuit Built in bias current indicator Switch on delay for the supply transformer 0 5s Power bandwidth 8Hz 45kHz 3dB ref 50W Frequency range 4Hz 90kHz 3dB ref 1W Harmonic...

Page 4: ...for bending leads or to hold components in place Small blade and phillips screwdrivers A basic range is fine For this projects a basic multi meter is required 1 2 Assembly Hints Make sure the skill le...

Page 5: ...by putting the four large valve sockets in place This will allow us to rest the board on the bench without having the component leads touching the bench surface When the component leads are put in the...

Page 6: ...NT Make the connection exactly as shown in the illustration otherwise the small piece of wire could touch the bottom of the cabinet see further 2 3 4 1 3 5 7 4 6 5 8 1 8 q V1 q V2 q V3 q V4 Also mount...

Page 7: ...h F1 mount 2 wires in the same hole 3 JUMPERS FOR AC POWER SE LECTION For 100V input mains mount q JA at the voltage selection 1 D C B A q JA at the voltage selection 2 D C B A For 115V 120V input mou...

Page 8: ...K Strike out the NOT used mains voltage indica tion at the back of the enclosure Use a per manent black marker 4 DIODES Check the polarity D CATHODE q D1 1N4148 q D2 1N4148 q D3 1N4007 q D4 1N4148 q D...

Page 9: ...470K 4 7 4 B q R18 680 6 8 1 B q R19 3K9 3 9 2 B q R20 10K 1 0 3 B q R21 10K 1 0 3 B q R22 1K5 1 5 2 B q R23 1K2 1 2 2 B q R24 560 5 6 1 B q R25 100K 1 0 4 B q R26 220K 2 2 4 B q R27 100K 1 0 4 B q R...

Page 10: ...3 B q R64 47K 4 7 3 B q R65 47 4 7 0 B q R66 47 4 7 0 B q R67 180 1 8 1 B q R68 180 1 8 1 B q R69 180 1 8 1 B q R70 47 4 7 0 B q R71 47 4 7 0 B q R72 180 1 8 1 B 8 LEDs Check the polarity LD COLOR 2...

Page 11: ...___________________________________________ 11 10 REED RELAYS Check the position of the notch PIN 1 1 RY q RY1 VR05R121 11 DIP SWITCHES 1 SW Check that switch 1 corresponds to pin 1 q SW2 DS 4P 12 RES...

Page 12: ...MARK You will have one 15 Ohm 5W resis tors left over for later use q R73 15 q R74 15 q R75 15 15 PCB BLADE TERMINALS Mount them as straight AS possible against the PCB A good solder joint is very imp...

Page 13: ...VE SOCKET 5 9 8 7 4 3 2 V 6 1 Mount them straight against the PCB q V5 B9A q V6 B9A 19 SWITCH SW SIDE VIEW IMPORTANT Don t leave a gap between the SWITCH and the PCB Mount it as square as possible aga...

Page 14: ...AYS The various relays have footprints that corre spond to the footprints on the PCB q RY2 VR10V121C q RY3 VR10V121C RY q RY4 VR5V122C RY 22 ELECTROLYTIC CAPACITOR Check the polarity C q C14 4 7 q C15...

Page 15: ..._______________________ 15 23 TRANSFORMER TRAFO q TRAFO1 12VAC 24 ELECTROLYTIC CAPACITOR Check the polarity Generally these capacitors are of the snap in type and cannot be mounted incorrectly C q C28...

Page 16: ...to check with an ohmmeter that the two 6 3V terminals are not shorted when the wiring is completed VIEWED FROM SOLDERSIDE 4 3 3 4 5 5 6 V4 1 8 2 1 7 8 f4 6 3VAC f4 f3 f3 6 3VAC f2 f2 8 8 1 6 7 5 4 1...

Page 17: ...of felt on every foot not supplied Mount a shakeproof washer and a 15mm threaded spacer on the front and back studding as shown in the illustration 15mm M3 SPACER M3 LOCK WASHER M3 BOLT FIG 2 Position...

Page 18: ...______________________________________________________________________________________________________________________________________________________ 18 M3 LOCK WASHER M3 NUT M3 BOLT MAINS INLET FIG...

Page 19: ...of 100 125VAC use the supplied 8A slow blow fuse while for 220 240VAC operation the 4A slow blow fuse needs to be fitted The spare fuse can also be stored in the fuse holder lid Mounting of the speak...

Page 20: ...the toroid transformers The output transformer marked ZD043 must be fitted according to the illustration on the right hand side of the cabinet Watch the location of the wires OUTPUT TRANSFORMER RUBBER...

Page 21: ...connector marked BLUE SK4 Use the supplied female push on connectors fig 5 and solder them onto the wires Connect the remaining wires to the terminal blocks SK16 and SK17 Pay attention to the colors...

Page 22: ...wn Connect the unit to a wall outlet by means of the supplied cord In some countries the supplied plug will not fit the local wall outlets If this is the case cut the supplied plug and replace it with...

Page 23: ...a small screwdriver Put the four KT88 or equal tubes in their sockets Watch the position of the notch IMPORTANT The remaining 15 Ohm 5W resistor must be hooked up between the centre and the 8 ohm spea...

Page 24: ...d on The SENSITIVITY trimmer located at the centre of the board allows you to trim the amplifiers input sensitivity so two units put out exactly the same level which improves the stereo image Normally...

Page 25: ...ut 1m 3 ft from the speaker there should be an negligible amount of hum present If there s still a reasonable amount of hum present check the bias current of every valve Also check the electrical conn...

Page 26: ...it idle for a while so it can adapt to the new environmental condition A valve that breaks down starts glowing cherry red Turn off the unit immediately Usually the 47 ohm 1W cathode resistor of the d...

Page 27: ...__________________________________________________________________________________________________________________________________________________________ 27 DIAGRAMS...

Page 28: ...6 ORANGE BROWN BLACK J4 J5 J6 J9 J7 J8 J10 J12 J19 J20 J21 J11 R30 C9 C10 C7 C8 230V 120V 100V 0 D C B A VOLTAGE SELECTION1 A 100VAC B 120VAC C 230VAC D 245VAC RED ORANGE VIOLET D C B A SELECTION2 VOL...

Page 29: ...N4007 LD1 L 56BHD GREEN D24 1N4148 12VDC C18 470u R1 470 D18 1N4007 D17 1N4007 D20 1N4007 R23 1K2 RED R24 560 D21 1N4007 ON SW1 OFF STB C16 470u C15 100u R22 1K5 R2 220K V ZD1 3V9 C14 4u7 R5 220K D1 1...

Page 30: ...00K RV1 100K 300VDC R62 100K 1W 110VDC R11 3K9 R50 100K 5W V5 7 ECC81 R41 100K 5W C3 330p 400V V2 R63 47K 1W C5 68n 630V 2 6 1 C10 68n 630V 220VDC R27 100K C9 68n 630V R25 100K V BLACK GREEN VIOLET 3...