How to Adjust the Counterweight for a 3D Printed Tonearm
3D printed tonearm
-the scale used for test is a 5g (maximum) stylus scale, with 0.01g precision
-the sure m44-7 needle expects 3-5g of weight for optimal tracking and audio performance
-Check Weight of Needle
1. Check the weight of the needle using a stylus scale (first measured weight is at 3.48g, see video)
2a. Increase the counterweight by removing tension from the counterweight rubber band. In this case, the rubber band moves from the inside position to the outside position to reduce tension (second weight is at 4.26g, see video).
2b. Tension can also be adjusted by using a rubber band of a different thickness, and also by stretching or releasing tension in the section of the rubber band between the base of the tonearm and the back of the tonearm
-the 12V rechargeable battery mod is highly recommended for use with this preamp mod
-the rechargeable battery mod, which gets regulated by the PT01, will remove power supply noise injected into the preamp by unregulated 9V D cell batteries
-the rechargeable battery mod is not required if you only use the wall power supply (it is regulated by the PT01).
1. unbox pp444
2. remove 4 housing screws from the PP444 and remove cover
3. remove 2 PCB screws
4. remove 2 panel mount screws (screws by RCA connectors)
5. remove PCB from enclosure
-Connect Tonearm Wires to PP444 Input
6. On the PT01 PCB, unsolder tonearm wires from J8, J9, and J16 (L_in, GND, and R_in)
7. Solder these wires to the bottom side of the PP444 PCB. see pic_1_tonarm_wires_to_pp444
-Connect PP444 Output to Numark PT01 Input
8. On the PT01 PCB, remove the 4 mounting screws.
9. On the PT01 PCB, unsolder and remove capacitors C8 and C18. see pic_2_c8_c18, and pic3_c8_c18_removed
10. On the PT01 PCB, solder 3 new wires to the 3 locations shown in pic_4_PT01_input
11. On the bottom side of the PP444 PCB, solder these 3 wires to the location shown in pic_5_PP444_output
-Connect the 9V Power Supply of the PT01 to the PP444
12. On the bottom side of the PP444 PCB, solder 2 new wires to the location shown in pic_6_PP444_9V_power
13. On the bottom side of the PT01 PCB, connect these 2 wires to pins 2 and 3 of TE11. see pic_7_PT01_9V_output
-Quick Test Before Final Install
14. Reassemble the turntable (no need for screws) and test for functionality. Use the wall power supply to power the PT01.
15. Hot glue all of the new solder points. This acts as a strain relief for the wires.
16. Reinstall the PT01 PCB with 4 screws
17. Wrap the PP444 PCB with electrical tape or polyimide (kapton) tape (see pic_8_PP444_tape). This is to avoid any potential shorts between the PP444 PCB, and the PT01
18. Set the PP444 PCB on top of the PT01 PCB (see pic_9_PP444_location),with the RCA connectors of the PP444 PCB facing the battery compartment.
19. Reassemble the turntable.
-On the PP444 PCB, remove all of the large connectors (RCA, etc.). This is not required, but will make it much smaller. This will make step 19 easier.
Adds an m44-7 Compliant Tonearm to the Numark PT01
3D printed tonearm
needle nose pliers
-connecting the shure m44-7 to a stock PT01 reduces audio output loudness (due to cartridge/preamp mismatch)
-the preamp mod is highly recommended for use with the m44-7, which boosts the m44-7 loudness
-this tonearm mod improves skating, when bouncing
-add platter bars for best bounce performance
-Bend Small Wires
2. Bend the small wires to a 90 degree angle form the wire housing to make an “L” shape (see pic_1_L_shape_wire)
2. Starting at the back side of the tonearm, and place the thick insulated part of the wire in the trough of the tonearm.
3. Slide the thick part of the wire along the trough towards the headshell. Allow the small wires to pass through the tight restraint sections of the tonearm. Don’t pull on the small wires. Just push the thick part of the wire, and guide the small wires through the restraint (see pic_2_wire install)
4. Continue sliding the wire through the tonearm until the small wires reach the headshell (see pic_3_wire_install_2)
-Mount the Cartridge
5. Connect the m44-7 or preferred cartridge to the tonearm wires
6. Mount the m44-7 to the headshell, by placing the nut on the topside of the headshell, and the screw/washer on the cartridge side (see pic_4_mount_m447)
-Install the Tonearm (David) Axle Rod
7. Place the tonearm on the tonearm base
8. Push the side of the rod that does not have a star on it through the tonearm (see pic_5_install_rod)
9. Guide the rod through the tonearm, metal tonearm base of the turntable, and opposite side of the tonearm
10. Press fit the star side of the rod into the tonearm plastic using a needle nose pliers (pic_6_press_fit_rod)
-Install Rubber Band Counterweight
11. Wrap the rubber band around the headshell side of the tonearm, and slide it towards the tonearm base (see pic_7_add_rubber_band)
12. Wrap the rubber band around the metal tonearm base (not the plastic part of the tonearm), and pull towards the back (see pic_8_rubber_band_base)
13. Align the rubber band with the grooves on the back of the tonearm, and attach to a tonearm peg (see pic_9_rubber_band_peg)
14. Adjust rubber band tension to control counterweight (see 3D printed tonearm counterweight adjustment guide)
-the pin used for the tonearm axle has a star on one end
-the star does not fit through the metal part of the tonearm base
-the star must be pushed away from the tonearm to remove the pin
-the pics show a version of the tonearm that needs to be pushed from the inside out. try this first
-if pushing inside out doesn’t work, try pushing from the outside in, like in the video
-Remove the Tonearm Axle
1. Remove the tonearm axle by pushing the pin out with a straight pick (see pic_1_remove_pin)
2. Remove the spring, which attaches the tonearm to the tonearm base (see pic_2_remove_spring)
3. Disconnect the wires from the needle cartridge (see pic_3_disconnect_wires)
-Remove Wire from Tonearm
4. The tonearm wire is connected to the tonearm with adhesive. Hold the insulated part of the wire (not the tiny wires) and pull the wire away from the tonearm. see pic_4_remove_wire and pic_5_removed