Posted on Monday, 23rd July 2012 by Auw Jimmy

I got a chance to short visit the Kuala Lumpur International Audio Video (KLIAV) 2012 show. It was held in JW Marriott Hotel at Bukit Bintang. Well, it’s a famous location with several shopping mall like Lot 10, Plaza Low Yat, Berjaya Times Square, and so on (I’m not used to shop, so hardly for me to remember all of them). I did a quick trip due to limited time, so here is the gift from the show. Basically for me who is more stere0-audio-centric, instead of visual-centric, the most interesting show was located on 8th and 7th floor. Totally, there was 5 floors used for this show.

This could be my first blog post with more than 50 pictures. So I cut them into several pages. I also didn’t have too much time to enjoy the system. So I will keep my comments for my own.

Btw, the good thing from this show was, many exhibitors were more than happy with a photographer like me. You could take any photo and even you got a warm ‘thank you’ after that!

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Tags: AV Show, KLIAV 2012, Kuala Lumpur, Malaysia
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Posted on Saturday, 14th July 2012 by Auw Jimmy

Please read here, here, here, here, and here before you continue reading this one. I believe that could give you an overview of this project.

Finally, we come to the day to have a listening test of this project. The comparison has been done with original Lundahl LL1673 (same Choke). Mine is potted, the other one is used as-is.

The system used is MP50Di power amplifier (a MOSFET amplifier). Originally, the preamp is Aikido based with 6AS7 and 6SN7 (correct me on this), but during this test, the tubes are changed with something new (compatible) which I can’t recall. This is a heavy 2-boxes preamp with marble enclosure. A big pain to move them from one place to another. So a big thanks to my friend DY who brings this today

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Tags: Choke, Lundahl, Potted
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Posted on Saturday, 14th July 2012 by Auw Jimmy

It’s a sunny Saturday. It has been agreed to have a measurement of some amplifier to check their power output. Located at Bintaro, I bring my Rigol Oscilloscope and Sanwa True RMS Multitester. Both should be enough to give rough measurement of the power output (and check whether they operate at A or AB class). As a source, we use 1 kHz tone, and around 7R/120W of dummy resistor.

I forgot how to activate Vpp and Vrms of this Rigol, so we use an additional RMS meter to measure the output. But finally I remember how to activate them and that simply simplify the testing.

After the test has been completed on several amplifier, we continue the session by some listening test and I take some pictures. Enjoy it

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Tags: Amplifier, MOSFET, oscilloscope, Power Output, RMS, solid state
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Posted on Sunday, 8th July 2012 by Auw Jimmy

Finally, the Lundahl potting project has been completed. Now it’s the time to give initial measurement of the project. First is very simple testing, the inductance test. Next week, we shall have a listening test with this Choke.

The inductance test shows a positive result (though it means nothing at this point, except no open wire during the curing of the potting material). The inductance result for both side of the choke are quite same (2.879 H). Resistance also measured quite stable at 31.5 Ohm.

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Tags: Choke, Inductance Measurement, Lundahl
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