Technics MN6042 Pitch IC
Moderators: piaptk, tragwag, Steve E., Aussie0zborn
Technics MN6042 Pitch IC
As most folks familiar with the Technics 'tables with digital pitch control know, the pitch synthesizer chip, MN6042, is very static sensitive and prone to failure. What seems to have escaped everyone's attention is that most working chips aren't working right. I've measured several samples, and they all essentially exhibited 8Hz frequency drift. This chip generates the quartz reference for the motor, so any drift at all isn't good.
Being an SP-10 MK3 owner and wanting the best possible performance from my 'table, I decided to design a modern replacement for the MN6042 chip. You can read about it here: http://fidelisanalog.com/product/mn6042/. It's designed to be a direct drop-in replacement, with far better performance and reliability than the original. I had a batch of boards made so I'm making some completed units available to help others out and hopefully recoup some of my sunk costs.
As these utilize a micro controller I was able to make a version with expanded pitch resolution. This version allows 0.01% adjustment - after setting the normal +/- 9.9% adjustment, you hold the reset button down for two seconds to enter hundredths mode, which allows +/- 0.09% adjustment.
If you purchase one please make a comment in the order notes that you heard about it here so I can contribute a portion of the sale back to the forum.
Thanks!
Being an SP-10 MK3 owner and wanting the best possible performance from my 'table, I decided to design a modern replacement for the MN6042 chip. You can read about it here: http://fidelisanalog.com/product/mn6042/. It's designed to be a direct drop-in replacement, with far better performance and reliability than the original. I had a batch of boards made so I'm making some completed units available to help others out and hopefully recoup some of my sunk costs.
As these utilize a micro controller I was able to make a version with expanded pitch resolution. This version allows 0.01% adjustment - after setting the normal +/- 9.9% adjustment, you hold the reset button down for two seconds to enter hundredths mode, which allows +/- 0.09% adjustment.
If you purchase one please make a comment in the order notes that you heard about it here so I can contribute a portion of the sale back to the forum.
Thanks!
Re: Technics MN6042 Pitch IC
Great work JPJones!!!
I need to get a MK3 to put one of these in
I need to get a MK3 to put one of these in
Re: Technics MN6042 Pitch IC
Or an SP-15, or even an SP-02 but I can't be 100% sure on the latter as I've never seen a schematic for it.
Re: Technics MN6042 Pitch IC
JP Jones , is very interesting for the engine Technics MK3, please show me 10 msec on the oscilloscope, please enable probe in point 1, IC204, FG, MK3, oscilloscope set at point 1 m sec / cm and lightly with your finger to slight brace plate turntable, please make a short video on you tube.
Re: Technics MN6042 Pitch IC
If I remember the next time I have my controller open. There'd have to be a far wider frequency drift than my board has to manifest as an issue visible with that test though.
Re: Technics MN6042 Pitch IC
I didn't see them on the compatibility list but I have to ask anyway - is this compatible with the lower SP-10s? I own a MK2.
Always looking for a SP-02 but not holding my breath.
Always looking for a SP-02 but not holding my breath.
Josh Bonati
www.bonatimastering.com
www.bonatimastering.com
Re: Technics MN6042 Pitch IC
The only SP-10 that uses the MN6042 IC is the MK3 - it's only used in the 'tables that have digital variable pitch.
Re: Technics MN6042 Pitch IC
I noticed these are now out of stock on your site - any chance you'll be re-stocking them? I'm now in the market for 2 if you've got them.
Josh Bonati
www.bonatimastering.com
www.bonatimastering.com
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Re: Technics MN6042 Pitch IC
Hi Mr. Jones
I'm Carlos, I need your help!
I have a SP10Mk3 that has stayed the last 28 years, stored on a shelf, is very well maintained, but needs a JP6042.
Please, can you sell me one or two units and send me in August?
greetings
Carlos
aviasom@gmail.com
I'm Carlos, I need your help!
I have a SP10Mk3 that has stayed the last 28 years, stored on a shelf, is very well maintained, but needs a JP6042.
Please, can you sell me one or two units and send me in August?
greetings
Carlos
aviasom@gmail.com