Posted on Thursday, 20th May 2010 by Auw Jimmy

In just few days, world lost two big guys, well known in the audio/music world.

First was Gesang Martohartono (1 October 1917 – 20 May 2010), a renowned Indonesia singer and songwriter, especially in kroncong style. He was famous throughout Asia, not just in his own country, Indonesia. His most famous song was Bengawan Solo. One of his best recording was recorded by JVC Japan here.

The other was Dr. Fritz Sennheiser (9 May 1912 – 17 May 2010), founder of Sennheiser, well known as professional microphone and headphone manufacturer. Sennheiser has become a respected brand in current audio world.

Good bye to both of you.

God bless!

Tags: fritz sennheiser, gesang martohartono
Posted in Personal | Comments (1)

Posted on Sunday, 16th May 2010 by Auw Jimmy

I plan to compare some capacitors from Jensen and one from Audio Note. The two from Jensen are Jensen Copper Foil Paper-in-Oil (Paper Tube) and Jensen Copper Foil Paper-in-Oil (Copper Tube). From Audio Note, I have Copper Foil Mylar-in-Oil (I believe this is Copper Tube also). We gonna have a serious battle later since those 3 caps are using different “recipe”. Both Jensen are Paper in Oil type, but with different enclosure. While the Audio Note has similarity with one of the Jensen with Copper Tube, but with Mylar instead of Paper. Audio Note claims the Mylar will provide better combination between sonic reproduction and the reliability.

Shall we prove the result? Later… We must wait after the burn-in session, probably in 100+ hours.

For the burn-in session, I sealed the Copper Tube caps with plastic. This is to prevent the oxidation of the copper tube (both Audio Note and Jensen Copper Tube oxides very fast in my environment due to high humidity, thanks to the purity of the material used also). I should prepare a transparent heatshrink for a good looking appearance, but no time to find one now. Perhaps you will ask why there are 2 pair of Jensen Paper Tube? One is my friend’s, to join the burn-in session before used on his system.

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Tags: Aikido, audio note, Capacitor, Duelund, jensen, preamp, tube
Posted in DIY Audio | Comments (29)

Posted on Sunday, 2nd May 2010 by Auw Jimmy

After reading my article about finding out capacitor inner-outer foil, some of my readers asked me to do the similar test on the resistor. Well, technically speaker, resistor shouldn’t have any inner or outer foil, since most likely it’s a piece of carbon or wire on the ceramic core. But let’s see the testing result. On this simple session, I used Kiwame (Carbon Film Resistor) and Mills (Wirewound). I also have some Riken or Shinkoh, but not really available in many values. For Kiwame, I used 1M, 470K, 100K, and 2K2. For Mills, I picked one value, 22K.

1 MegaOhm readings below showed 332 mV.

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Tags: oscilloscope, resistor
Posted in DIY Audio | Comments (31)