This is a Simplified Ultrapitch Modification for the Numark PT01
Parts needed:
Resistor between 1k ohm and 2k ohm
notes:
-when the platter speed switch is set the 33rpm, the platter will spin at ~22rpm
-when the platter speed is set to 45rpm, the platter will spin at 33rpm
-this mod can only be done on newer (example 2014) PT01 turntables
-older models, such as circa 2006, have a different motor control circuit and require a different mod
-the new models have the orange potentiometer shown below, where the older models have a blue potentiometer
-download the “RPM – the turntable speed accuracy checker” iPhone app to test platter speed
-this mod came from a forum comment by Rasteri, which said “Replace VR1 with a 2K resistor and that lowers the 33RPM speed to about 20RPM”
-buy Dj Focus’ ultrapitch mod for full control, and to support the skratch community
-works with ultrapitch 7” records, such as skiratcha breaks from DJ A1
-Remove and Replace VR1
1. Unsolder the potentiometer in VR1
2a. Solder a resistor across the 2 pins shown in pic_1_replace_VR1. This picture shows a 2.2k ohm resistor in place of VR1. This results in a platter speed of ~20rpm, when the platter speed switch is set to 33rpm, and ~32rpm when set to 45rpm (varies between turntables).
-Alternate VR1 values
2b. It was found through test that a 960 ohm resistance across VR1 results in a clean 33rpm, when the platter speed switch was set to 45rpm. This resistance results in 22rpm, when the platter speed switch is at 33rpm. A 820 ohm and 150 ohm resistor were connected in series to achieve ~970 ohms. The resulting speed vs. resistance value depends a lot on the friction between the spindle and the platter. A value between 1k and 2k ohm should work great. see pic_2_replace_VR1_series
Great work on the ultrapitch research and mod! Thank you. Out of curiosity, what speed does the 78 setting play at?
I didn’t test it. I was focussed on getting a clean 33rpm at the time.
I don’t have that mod installed right now, so I can’t check. I’ll update the tutorial, if I re-install it.
I just performed this mod and on 78 I’m getting 64.65 bpms. I used a 1k ohm 1/2 Watt resister from Radio Shack.
How long does the rechargeable last?
Depends on if you’re using the speaker or headphones. I usually only use headphones. I recharge mine every couple of weeks or so. I don’t use it for more than an hour a day.
Hi guys. A noob here. Could I know what does the ultraptich do? Is this the same as the pitch control? I would like to use this turntable to beatmatch and I hope that I can get a very refine measurement. If I install the ultrapitch mod, does this give a more refine pitch control? I checked on the internet and the pitch is not very refined on the original knob. If not, is there a way we can have a more accurate pitch for beatmatching? Thanks
Using the ultrapitch knob for beat matching would be challenging.
I’m not aware of a mod that gives a accurate pitch control for beat matching.
I am actually trying to do the same thing and have not been able to find any info on this. But i am planning on moding mine with a pitch slider so that i can adjust them and be able to see where the adjust ment is at. It seems a bit difficult with a knob. As far as accuracy goes…idk. I know i can at least have them calibrated to each other. I have not done this yet but will in the next week or so.
You could use a slide potentiometer with the ultrapitch board, if you get the same impedance as the rotary knob that’s on there.
A slider doesn’t make pitch control more accurate, though.
A rotory knob will have the same accuracy, it’s just weird if you’re used to technics.
I just did this to my unit. Interestingly enough it takes 4k Ohm for mine to reach the 22rpm. A little tweak on the 45 pot made it also play at 33rpm at that setting. Good enough for the cost of 2 hours of fiddling and 0.02€ worth of parts. 🙂
I would like to know how i can do this mode on an older original Numark PT01 USB from 2008 that works like new , the only problem is that it has the blue knobs so i’m a bit stuck .. Any help will be greatly appreciated !
I didn’t do a simplified ultrapitch mod for that model.
It has a different pitch control circuit, than the newer models.