A and T Labs K6, Assembly Manual

Page 1: ...K6 AUDIO POWER AMPLIFIER ASSEMBLY MANUAL A and T Labs Inc P O Box 4884 Wheaton IL 60187 Tel 630 668 7870 Fax 630 668 7870 Web www a and t labs com Technical Support support a and t labs com...

Page 2: ...MPLIFIERS 1 2 2 INVERTER POWER SUPPLY 4 3 CONSTRUCTION 4 3 1 AMPLIFIER BOARDS 6 3 2 INVERTER POWER SUPPLY 10 3 3 HEAT SINKS AND MECHANICAL ASSEMBLY 12 3 4 POWER SUPPLY FLANGE MOUNTED COMPONENTS 13 4 T...

Page 3: ...ers of amplifiers tout this large energy storage as a virtue it is not in fact a necessity for driving audio loads and constitutes a destructive threat to the output transistors in the case of abusive...

Page 4: ...e performed on the amplifier board The first is automatic servo nulling of DC input offset voltages ensuring no DC at the output of the amplifier This is achieved by IC4 which senses any DC at the out...

Page 5: ...g Amplifier Differential Input Amplifier Left Channel Clipping LED Protection DC OT LED Output Bridging Output Direct Input Differential Input Level Power Amplifier Bridging Amplifier Differential Inp...

Page 6: ...y to generate the 5 volt sum output The result at pin 7 of IC3 is fed back to the pulse width modulator comparator input pin 2 of IC1 where it is compared with the internal voltage reference applied t...

Page 7: ...41v is intended for use with very low impedance speakers to limit amplifier power dissipation 58v may be set to limit 8 ohm power output to about 130W channel or for typical operation with 4 ohm spea...

Page 8: ...nels in parallel for efficiency of effort Begin by installing all resistors capacitors and diodes in their appropriate places See parts placement Figure 4 Check values of resistors as you proceed and...

Page 9: ...R12 33 2 Or or red gold R52 1K Brn blk blk brn R13 33 2 Or or red gold R53 510 1W Grn brn blk R14 162 Brn blu red blk R54 510 1W Grn brn blk R15 1K Brn blk blk brn R55 10K Brn blk blk red R16 1K Brn...

Page 10: ...required for bridging option Parts required for differential input Parts required for extra output transistor option 3 1 2 Capacitors Part Value Part Value Part Value C1 10uf 50V C9 22uf C17 10uf 35v...

Page 11: ...end with the power components at the back of the board for the 5 unit 2 The clipping and protection indicator LEDs go on the opposite end from the input jacks of the board front for the 3 unit or on...

Page 12: ...old R27 16 9K Brn blu wht red R6 75 Viol grn blk gold R28 36 5K Or blu grn red R7 75 Viol grn blk gold R29 15K Brn grn blk red R8 75 Viol grn blk gold R30 100K Brn blk blk or R9 75 Viol grn blk gold R...

Page 13: ...M358 D8 1N4002 D13 1N4742A Q5 VN0610LL D9 1N4742A D14 1N4735A REG1 7812 Install the transformers and current transformer inductors ZNR1 TR1 LEDs bridge rectifiers and the fuse holders The current tran...

Page 14: ...th the heat sinks per the drawings The lateral positioning of the flanges on the boards for the 5 unit is approximately centered The mounting of the flanges to the heat sinks can be accomplished with...

Page 15: ...lues and orientation Also re check the quality of all solder connections Next install F1 and F2 but leave out F3 Make sure jumpers Jmp1 2 3 and 4 are installed properly for the supply voltage of inten...

Page 16: ...you should see is approximately 75Khz somewhat rounded square waves with the signals at Q1 and Q2 in phase and those at Q3 and Q4 in phase and both pairs 180 degrees out of phase with each other If th...

Page 17: ...er Miscellaneous Power Parts Part Description Part Description REG1 LM317T TC1 67F080 REG2 LM337T Q24 IRF510 Install 1 2 amp fuses for F1 and F2 and temporarily connect the power supply to an amplifie...

Page 18: ...ameter in place of F2 Adjust R18 for an idle current of about 240 mA The bias must be re set for long term operation at different voltages Remove the ammeter and install a 1 amp fuse for F2 Check that...

Page 19: ...ach amp Fans to 12V power on power supply Output ground from binding post to each amp Power supply voltage select switch switch installation Power supply power and shutdown LEDs wires 12 volt relay po...

Page 20: ...d an LED indication The supply will reset itself when the overload is removed Finally for maximum performance and power output into 8 ohm loads use the 82 volt power supply setting Remember that the b...

Page 21: ......

Page 22: ......

Page 23: ......

Page 24: ......

Page 25: ......

Page 26: ......

Page 27: ......

Page 28: ......

Page 29: ......

Page 30: ......

Page 31: ......

Page 32: ......

Page 33: ......

Page 34: ......

Page 35: ......

Page 36: ......

Page 37: ......

Page 38: ...DigiKey C18 1500pf P4863 DigiKey C19 1uf 35v P6260 DigiKey C20 82pf P4848 DigiKey C21 01UF P4513 DigiKey C22 01UF P4513 DigiKey C23 82pf P4848 DigiKey C24 82pf P4848 DigiKey D1 1N4148 1N4148 Hosfelt...

Page 39: ...MPSA06 26462 Jameco Q15 MPSA56 MPSA56 DigiKey Q16 IRFP9240 DigiKey Q17 IRFP9240 DigiKey Q18 IRFP9240 DigiKey Q19 IRFP9240 DigiKey Q20 IRFP240 DigiKey Q21 IRFP240 DigiKey Q22 IRFP240 DigiKey Q23 IRFP24...

Page 40: ...giKey R40 825K 825KXBK DigiKey R41 46 4K 46 4KXBK DigiKey R42 402 402XBK DigiKey R43 10K Pot 308NPC103 DigiKey R44 825K 825KXBK DigiKey R45 1K 1 00KXBK DigiKey R46 5 11K 5 11KXBK DigiKey R47 1K 1 00KX...

Page 41: ...r Input Jack 161 4217 Mouser 1 4 jack 550 20301 Mouser Term Blocks 5 ED1601 ND DigiKey PCB ATL1995 1 Pentaplex SW1 TA2UEECAU EG1003 ND DigiKey TO 220 ins Kits 4 34121 Jameco TO 247 Insul 8 BER178 Digi...

Page 42: ...Key D1 MUR1540 FR805 DigiKey D2 MUR1540 FR805 DigiKey D3 MUR1540 FR805 DigiKey D4 MUR1540 FR805 DigiKey D5 1N4002 Hosfelt D6 1N4002 Hosfelt D7 1N4002 Hosfelt D8 1N4002 Hosfelt D9 12V 1N4742A Hosfelt D...

Page 43: ...0H DigiKey R17 3 48K 3 48KXBK DigiKey R18 1K 1 00KXBK DigiKey R19 2 05K 2 05KXBK DigiKey R20 10K 10 0KXBK DigiKey R21 10K 10 0KXBK DigiKey R22 1K 1 00KXBK DigiKey R23 1K 1 00KXBK DigiKey R24 100K 100K...

Page 44: ...4 ETD49 T QSE2 QSE TR1 KC022L ND DigiKey Term Blocks 10 ED1601 ND DigiKey Insulators 4 BER178 DigiKey Fuse clips 6 F041 DigiKey PCB ATL1995 2 Pentaplex Per channel chassis components Binding posts 80...