Tavish Design 6SL7, Assembly And Setup Manual

Page 1: ...TAVISH DESIGN LLC Made in U S A Vintage 6SL7 Phono Stage MM MC Assembly and Setup Manual...

Page 2: ...Setup 4 2 Operation 4 3 Tube Replacement 5 Technical Information 16 5 1 Specifications 5 2 Schematics 5 3 Parts Placement Diagram 5 4 Parts Lists 6 Warranty and Service 29 7 Do It Yourself Guidance F...

Page 3: ...see the Quick Start instructions below Feel free to contact Tavish Design if you have any questions info tavishdesign com Quick Start 1 Install the tubes See Section 4 if you haven t done this before...

Page 4: ...e to run into the amplifier as this can damage the amplifier or create an electric shock hazard Do not operate outdoors or in wet areas Do not allow rain to enter the amplifier by placing the unit nex...

Page 5: ...er on electrical safety Kit assembly requires a soldering iron with a fine tip and a digital multimeter DMM along with other normal electronics workshop tools Unpack the box and verify the following i...

Page 6: ...index slot with the marking on the PCB as show in Photo 3 1 Double check the index alignment and make sure the sockets are fully seated against the top of the PCB before soldering all pins Photo 3 1...

Page 7: ...t washer and nut to mount Q2 and IC2 no flat washer needed for IC2 to the PCB before soldering IC3 slides into heatsink HS1 and mounts upright 5 Install D1 and D13 Zener diodes 6 Install D7 D10 fast r...

Page 8: ...olarity as marked on the PCB 13 Install the three PCB test points a black one in the AGND pad a red one in the HV pad and a yellow one in the P18 pad 14 Install the rest of the small components includ...

Page 9: ...al ground from shorting to the chassis they must be isolated to prevent ground loops See photo 3 5 below Solder only one leg of each component making sure they are seated against the PCB then test fit...

Page 10: ...use 20 Install the eight long nylon hex spacers on the bottom of the PCB using 6 32 nylon hex nuts on the top of the PCB Photo 3 6 Completed PCB after step 20 21 Double check that you have installed t...

Page 11: ...he upper chassis hole for the moving coil input red to the center signal terminal 26 Install and connect the ground post 27 Install and connect the rocker switch 28 Install the front panel LEDs connec...

Page 12: ...n the wall transformer and switch the unit on Measure the voltage at the P18 pad and adjust trimmer R9 for 18 6 V Turn off the power and wait 10 minutes for the capacitors to discharge 31 Connect the...

Page 13: ...er unplug the unit and wait 10 minutes for the internal capacitors to discharge Remove the cover by removing 4 screws Moving Magnet or Moving Coil Input MM cartridges connect to the MM input obviously...

Page 14: ...for some popular cartridges These are only a starting point Follow your cartridge manufacturer s recommendations or select the loading to suit your preference In selecting the capacitive load for a M...

Page 15: ...able 4 3 MC Load Settings Cartridge Type Example Reference Output Input MC Gain Setting S3 1 2 MM Load S2 1 7 MC Load S1 1 7 MM AT95e 3 5 mV MM N A 47 pF 1001100 N A MM Ortofon 2M 5 5 mV MM N A 47 pF...

Page 16: ...in the phono stage In particular many people confuse the 6SL7 with the 6SN7 Unfortunately the 6SN7 cannot be used in any position in the phono stage The unit is normally supplied with either Sovtek 6H...

Page 17: ...utput Overload defined as 1 THD level 14 V RMS into 22 k at 1 kHz 31dB overload margin Input Impedance Moving Magnet 47 5 k in parallel with fixed capacitance of approximately 85pF and adjustable capa...

Page 18: ...pical measured distortion over frequency 560 mV RMS output level into 22 k ST Sovtek 6H9C 6SL7GT TS Tung Sol Reissue 6SL7GT 1 0 8 0 6 0 4 0 2 0 0 2 0 4 0 6 0 8 1 10 100 1000 10000 RIAA Equalization Er...

Page 19: ...18 Fig 5 3 Schematic sheet 1 of 4...

Page 20: ...19 Fig 5 4 Schematic sheet 2 of 4...

Page 21: ...20 Fig 5 5 Schematic sheet 3 of 4...

Page 22: ...21 Fig 5 6 Schematic sheet 4 of 4...

Page 23: ...22 Fig 5 7 Circuit board component placement...

Page 24: ...user 667 ECA 1EHG101 1 C14 68uF 350v electrolytic 7 5mm LS Mouser 647 UCS2V680MHD 2 C15 C16 2 2uF 400v electrolytic 5mm LS Mouser 647 UVR2G2R2MPD 4 C101 C105 C201 C205 33uF 250v electrolytic 5mm LS Mo...

Page 25: ...P 1 IC2 7805 5v fixed TO 220 regulator 1 IC3 LM1086IT ADJ Adj TO 220 regulator Mouser 926 LM1086ITADJNOPB 1 IC4 LM317LZ Adj TO 92 regulator 1 IC5 LM311N IC Comparator 8 pin DIP 2 ICS1 ICS2 IC socket 3...

Page 26: ...rbon film 2 R13 R26 1M 1 2W 5 carbon film 1 R15 No longer used 1 R17 22k 1 2W 5 carbon film 1 R19 470 1 2W 5 carbon film 1 R20 47 1 2W 5 carbon film 1 R21 36k 1W 5 metal oxide Digikey 36KW 1 ND 1 R22...

Page 27: ...ol or JJ 6SL7GT 150k better for Sovtek 6H9C metal film Mouser 273 160K RC 2 R112 R212 470 1W 5 metal oxide Digikey 470W 1 ND 2 R117 R217 47 5k 1 2W 1 metal film Mouser 273 47 5K RC 2 R118 R218 820 1 2...

Page 28: ...part See Sec 7 Digikey 1295 1047 ND 2 J1 J2 PJRAS1X2 Switchcraft dual phono jack Mouser 502 PJRAS1X2S01AUX 1 FH1 LITTLEFUSE649 5x20mm fuseholder Digikey WK0011 ND 1 F1 400mA fuse Littlefuse 0217 400H...

Page 29: ...3 8 6 32 black oxide pan head screw 2 3 24 plastite screw 1 ground terminal 1 4 20 4 6 32 split washer 1 6 nylon flat washer 1 ground post Emerson 111 2223 001 Mouser 530 111 2223 001 1 1 4 20 tooth w...

Page 30: ...fications not authorized in writing by Tavish Design lightening power surges or acts of God Use of parts not obtained from Tavish Design may void this warranty This warranty is limited to the replacem...

Page 31: ...hout the kit and includes some guidance on parts substitutions finding parts and powering the board outside North America It is based mostly on questions we ve answered by email and we ll update it as...

Page 32: ...will have lower noise and higher gain Leaving the cathode resistor un bypassed will decrease the gain and distortion and it will increase the noise and the output impedance So it is generally best to...

Page 33: ...for Tung Sol and JJ 6SL7GT but remain 150k for Sovtek 6H9C 2 R15 is deleted 3 R29 changes from 15k to 12k 4 C5 becomes 1uF MLCC Previous Design Changes with Release 2 0 1 R118 and R218 change from 680...

Page 34: ...Tavish Design is a registered trademark of Tavish Design LLC Tavish Design is continuously improving its products and reserves the right to make changes to its products without incorporating those ch...