Phono Preamp Kit Installation Guide for the Numark PT01 Scratch
-phono preamp kit
-wire of your choice (not included)
-requires the m44-7 tonearm mod
-works with the PT01 Scratch using it’s standard wall power supply, or with the rechargeable battery mod
-works with PT01USB with the rechargeable battery mod (the standard wall supply is not good enough)
-designed for use with the Shure M44-7, but also works with other moving magnet cartridges
-the non-USB version of the PT01 and Vestax Handytrax have not yet been tested
-the front controls of the PT01 will still work after this mod
-the bass kill switch install is not required for operation. Bass kill is disabled by default.
-keep an eye on the wiring, when closing the turntable after install. Don’t let the wires get smashed.
3. Remove PCB screws (see pic_3_remove_PCB_screws)
4. Remove capacitors C8 and C18 from the main Numark PCB (see pic_4_remove_C8_C18). See pic_5_C8_C18_bottom for a bottom view of the PCB, when the capacitors are removed
-Add Line Audio Wires
5. Strip about 3mm of insulation from two short wires (about 2 inches long each).
6. Drop the stripped wire into the existing capacitor hole (see pic_6_add_line_audio_wires)
-note that the guide uses white wire for Left channel audio, and red wire for Right channel audio
7. Solder the wires on the bottom side of the PCB
-Mount Phono Preamp
9. Remove one of the wide head start/stop switch mounting screws (see pic_8_remove_switch_screw)
10. Remove the pan head GND mounting screw (see pic_9_remove_GND_screw)
11. Bend Numark capacitors C7 and C17 into a horizontal position, so they do not touch the bottom of the new preamp. Note that The Numark circuit below the new preamp will no longer be used, so those capacitors can be unsoldered or cut out with cutters, if required. Typically, they can be easily bent into a horizontal position. The horizontal position of those 2 capacitors can be seen in pic_2_unsolder_tonearm.
12. Use the pan head GND mounting screw to mount the phono preamp on the start/stop switch mounting hole (see pic_10_mount_preamp)
13. Use the wide head start/stop switch mounting screw to re-secure the GND terminal (see pic_11_replace_GND_screw)
-note: we are just swapping screws here, so the smaller head screw mounts the phono preamp
-Connect Audio Wires
14. Loosen the screws of the green terminal blocks (all of them), so that the jaws of the terminal blocks are open.
15. Place the tonearm wires into the AUDIO_IN phono preamp terminal block and tighten the terminal block screws (see pic_12_connect_tonearm_wires)
16. Place the Line audio wires into the AUDIO_OUT phono preamp terminal block and tighten the terminal block screws (see pic_13_connect_line_wires)
-Connect Power Wires
17. Solder wires to the PT01 power PCB regulator as shown in pic_14_solder_power_wires. These wires are long to allow the turntable case to flip open for future mods.
18. Place the power wires into the phono preamp power terminal block, and tighten the terminal block screws (see pic_15_connect_power_wires).
19. Position the new wires, so they don’t get pinched by the turntable mounting screws.
20. Reassemble the turntable