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Numark PT-01 modding thread


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#721 rasputin

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Posted 02 September 2017 - 01:45 AM

I am more than happy about having finished some ideas that have been bugging my mind since a while. I never liked that "tone" knob, so I decided to "put it to rest", and move the "speed selector" to that place. The less buttons, the better. All the board's parts are actually still in place, however the "tone" potentiometer's lever was chopped, and the "speed selector" was heavily chopped/modified. The rest is done through a few 3d-printed parts, including new buttons for volume/pitch. Same applies to the Start/Stop button "flush" install, which is a modified Sanwa button with 3d-printed FLAT cap (on the quality caps like Sanwa, You can take the cap off). I never liked the arcade buttons' round top. It's not all finished yet, just a dry-build. There's some more parts I made, the platter and the headshell, but I have elaborated on these more than enough in previous posts...
I had intended to cover the whole thing with a decal in the end, but the more I actually worked on it, the more I liked the idea to keep it look "stock, with an unflashy twist" (even though I like that "rough" or "used" look of the Start/Stop, I believe it needs a final paint job).

 

 

 

45f953-1504314438.jpg

 

 

Little video, showing the functionality (and some really horrible scratch skills):

https://www.youtube....h?v=cKIp27xqcMg

 

Longer version which also shows how You can install a platter within seconds (grab the ring from the top, not from the bottom):

https://www.youtube....h?v=gUvfgNJ0Avo

 

 

One pole of the switch handles the speed, the other handles the torque - different speeds (apparently) require different torques.

Ah, so one controls voltage, and the other one currency? I finally understood why there are 2 switches visible in Your circuit diagramm (which I'm extremely thankful for).

 

r


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#722 iexist

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Posted 13 September 2017 - 03:30 PM

I just upgraded my tonearm to a bihari + shure m447.

 

I'm curious though, the tone arm on my pt01 always felt loose. And now even with the new tonearm, it feels loose.

 

Is there a way to tighten this up?

 

Here is a video for reference:

https://youtu.be/1B4s_Z24U7Q


"here you are kids. here's a set of turntables, but dON'T YOU DARE COPY MY STYLE BITCH!" - Symatic


#723 evil98

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Posted 14 September 2017 - 01:14 AM

I just upgraded my tonearm to a bihari + shure m447.

 

I'm curious though, the tone arm on my pt01 always felt loose. And now even with the new tonearm, it feels loose.

 

Is there a way to tighten this up?

 

Here is a video for reference:

https://youtu.be/1B4s_Z24U7Q

 

you could use washers to make up for the slop. 

 

the shaft is maybe 2mm in diameter.



#724 yopieliu

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Posted 22 September 2017 - 03:27 AM

.

Edited by yopieliu, 25 September 2017 - 06:16 PM.


#725 Mutis Mayfield

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Posted 29 September 2017 - 10:25 AM

Handytrax service manual from Focus fb group (Mark Hallonquist) courtesy
http://www.kevinchan...ndytrax_usb.pdf

#726 rasputin

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Posted 02 October 2017 - 07:01 PM

I'd like to share my very own idea of "the perfect portable":

4cbdaf-1506970848.jpg

http://www.bilder-up...-1506969503.jpg

http://www.bilder-up...-1506969607.jpg

http://www.bilder-up...-1506970125.jpg

 

- Custom-made 3D-printed platter
- Custom-made tonearm, adjustable counterweight
- Modified Shure M44-7 cartridge
- Phono-preamp (Av:Link STP-2)
- Phono buttons (red, from top to bottom): Gain, Speed (relocated stock knob), Pitch, Start/Stop (modified Sanwa)
- Custom made fader box (can house JDDX2RS or Innofader)
- Raspberry Pi, AudioInjector soundcard, 5" touch display, plus PiDeck software => DVS inside
- Button to switch between "phono" and "DVS" mode
- USB port for MP3 files on a USB stick
- Line-Out (Cinch & 3.5mm)
- Relocated speaker position, high-quality 2" fullrange driver (Monacor SPX-21M)
- Dedicated vented cabinet (~0.4 litres, tuned to 110 Hz), vent exits at the turntable's bottom to boost bass
- 6W aplifier (Kemo M033N), power/volume knob
- Headphone amplifier (M-Audio Bass Traveller)
- Line-In
- 5V 10Ah powerbank (Fontastic "Eta"), powers the DVS system and headphones amp, plus
- 9V Step-Up power regulator to power the PT01 circuit boards

 

It was all wired up and working before disassembling and preparing the parts for the "final build". So it's not 100% finished yet, i.e. cover plate, front/rear panels and faderbox cover plates are still missing,..

 

r

 


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#727 Mutis Mayfield

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Posted 27 October 2017 - 11:20 PM

http://atelier.tkrworks.net/
https://github.com/t...gmaMIX_Hardware

#728 Mutis Mayfield

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Posted 27 October 2017 - 11:22 PM


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#729 kleerkoat

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Posted 03 November 2017 - 08:51 PM

is there anything comparable to the power boards JDD and OpenFormat have in their kits?



#730 PortableModManiac

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Posted 07 November 2017 - 03:11 PM

I just upgraded my tonearm to a bihari + shure m447.
 
I'm curious though, the tone arm on my pt01 always felt loose. And now even with the new tonearm, it feels loose.
 
Is there a way to tighten this up?
 
Here is a video for reference:
https://youtu.be/1B4s_Z24U7Q


I have been obsessing over the Bihari Tonearm for far too long and worked out a few things that I am glad I fixed before I damaged my timecode vinyl. The first thing is that the height is only reasonably aligned with the weight on the headshell. The only thing wrong with that was the weight was doing damage to the Serato vinyl. I was a total turntable, DJ and vinyl novice before getting a PT01. I had to learn and guess what the tutorials were talking about as I went.

I hadn't aligned a cartridge before so trying to get info on how to get a good alignment with a custom tonearm and a portable turntable online was not happening. I realised that Serato DJ has a DVS calibration tool and I used that to get a reading on the Shure cartridge. I noticed the weight was carving up the grooves after using the same spot then recalibrating. I then removed the weight. The problem then was the arm angled down and skipped more.

Long story short I readded the weight and made a counter weight using a pack of round coloured magnets. Same colour and different sizes so that the weight could be adjusted. This fixed the alignment and skips but I also noticed the weight of the arm is probably too much for the original thin metal base that the Bihari connects to. This also gives the false impression of balance initially as the thing is stiff and won't lean towards the heavy side.

Moving this eventually loosens the hold and the metal bands. Anyway I have posted this on Instagram and will try link it here.

https://instagram.com/p/BaJRD1fASXz/

Some people found the weight was doing damage and others think I am going too far for a PT01 lol.
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#731 Mutis Mayfield

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Posted 07 November 2017 - 04:10 PM



If you remove the last / of instagram links forum usually embeds them. ;)

#732 PortableModManiac

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Posted 07 November 2017 - 04:42 PM

https://instagram.com/p/BaJRD1fASXz
If you remove the last / of instagram links forum usually embeds them. ;)

Ha thanks I have been lurking here but not posting as I find it hard enough to follow the info I have a question about the tonearm wiring that is something I want to try but I can't explain it properly.

I am thinking of doing the Bihari mod on a PT01 USB that is used for DVS with Serato. I have been able to get a vintage deck and wire the tonearm wiring to an RCA jack and the output is fine using the Akai AMX phono input. The only thing that is different is the vintage has no internal circuits I stripped it out.

Would it be possible to wire up the Bihari and cartridge to the RCA directly? Or is it just the same signal if I left the stock preamp inside?

Link To Clip of The RCA AMX Test

I hope that link is embedded (probably isn't) but it shows the deck which I have been able to get the tonearm wiring to an RCA output and then sent to the AMX. I am trying to find a way to go directly from the Pt01 USB tonearm wiring to the PCB with the RCA output on without damaging the setup so possibly a switch that activates the built-in preamp and then turns it off for phono input to a DJ mixer.

Or is leaving the stock preamp inside and using a Shure cartridge basically the same as no preamp?

Edited by PortableModManiac, 08 November 2017 - 11:05 AM.



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