Nattawut Uamkruea, blogger and audio gear maker who passionate in vacuum tube, audio & music.
Producing electronics projects since high school. Seriously upgrade and modify vintage audio equipment for “Real Sound” concept.
He is a co-founder of Soundaries and Sentimental Studio, all audio solution provider.
Experienced and lively explore the listening rooms & audio shops in Japan as his most favorite to do.

Friday, April 22, 2016

Marantz Model 7 (Reissue Version) in upper level after modification

After success with modification of Marantz 7C original version.

http://mellowgroovy.blogspot.com/2016/01/marantz-7c-modify-Real-Sound.html

Another friend who has Marantz 7C reissue version asked me to make it better.

Almost signal capacitors using modern film type,

so many audio guys who compare with original one might not like a newer version.

 See pictures below for 7C reissue version before take modify.










Almost parts for modification like previous 7C except using Ohmite Brown Devil resistors 

in rectifier section for make more "Vintage like" sound.  

All coupling capacitors still using Arizona Capacitor that's the best one for

modify vintage audio gear in my opinion. 







Add 3 oil capacitors for decoupling all supply voltages.


Ultra fast recovery diode from ST is a great choice for upgrade to next level.



Everything that doing above, make Marantz 7C reissue has more musical and "Real" sound.

Not different with original version that I do modify before,

because all effective components are same parts.

Worth to try with yours.

Cheers !!!

Monday, April 11, 2016

Visit SPEC Corporation Office in Cherry Blossom Season

Last 2 weeks, I have a short trip in Tokyo and plan to visit SPEC Corporation too.

Not too large office but high quality product design and testing !

Mr Shirokazu Yazaki and his team are kind of nice & smart people.

I have order him a lot of his Arizona capacitors for my second Marantz 7C modification

after the first mods and other projects were success with this high quality capacitor.

http://mellowgroovy.blogspot.com/2016/01/mcintosh-mc275-modify-part2.html

http://mellowgroovy.blogspot.com/2016/01/marantz-7c-modify-Real-Sound.html

 And also go on in part of distributor for Arizona capacitor in Thailand too.

So many people here can taste this gem easier.


In front of SPEC office.


High quality class D amplifier.


Their Real-Sound Processor.


Part of this order for using and testing to find out which matching in each sound character. 


Ruby mica capacitor for improve sound quality in many applications.


Yazaki-san gave us additional modification points for Marantz 7C and others.

Very impressive in his knowledge and kindness.


SPEC's design engineer in his test bench.


Me, Yazaki-san and SPEC team.


My buddy Tanawat, another co-founder of our startup company.


Yazaki-san bring us to see beautiful garden behind the building.


Our team in this Tokyo short trip. ;)


Cherry blossom season.



When we visit Tokyo next time, Yazaki-san will bring us to his home.

To see his system in part of  DIY audio too. *-*