Posted on Tuesday, 15th November 2011 by Auw Jimmy

So far, Auricap is one of my trusted capacitor brand – in power supply section. I still remember ‘few’ years back (when using this capacitor for the very first time) and comparing with Solen, Hovland, and Bennic XPP in my very first DIY speaker. Sounds familiar – if you were ever there.

Now, time has changed, but Auricap remains there. Affordable and sounds quite natural capacitor. I receive information from my colleague that Auricap releases latest type, the XO series. Not quite sure why Auricap uses XO as their new model. Probably as this new capacitor also available in very larger version (100 uF++, if I’m not mistaken).

Auricap is still my favorite in power supply section, after Solen. Well, so far if you are thinking a full film capacitor power supply, then Solen is a nice and realistic choice, as they are available in large capacitance, adequate 400-630 VDC, and definitely affordable price. Now, with the arrival of Auricap XO, which also offers large capacitance and high voltage, then the different is all about money (and performance to justify the cost).

I order 0.1 uF / 400 VDC and plan to use them in power supply section of my new Aikido Preamp.

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Tags: auricap, Auricap XO, Capacitor, preamp
Posted in Collectible Stuff, DIY Audio | Comments (2)

Posted on Sunday, 13th November 2011 by Auw Jimmy

During the upgrading process, the old Ceramic tube socket also got new replacement to the Teflon one. The problem is, the process to remove the old tube socket will not be an easy job, as removing other parts. Why? Because as other part usually only has 2 leads, the tube socket got 9 points to be removed.

Actually if you really want to re-use the old socket, you have to use hot air solder to remove the perfectly. But I don’t really have the need to re-use the old socket. So I cut them directly.

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Tags: Aikido, preamp, solder, Teflon, Tube Socket, WBT
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Posted on Monday, 7th November 2011 by Auw Jimmy

As I’m about to move my Aikido Preamp to a new ‘home’ (I mean, new chassis), then it’s time to fix all the components used there. Before, I have tested several components on different section and later then I got final conclusion to put what on where, etc. Below you can see one of the original parts used during my earlier testing stage. Now it’s time to finalize?

One most difficult thing is to unsolder all the components first. As you can see below, most of the parts are not yet fixed (long leads, hanging here hanging there, etc etc). Unsoldering them definitely would not be a nice evening job.

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Tags: Aikido, preamp, TX2575, Z201
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Posted on Monday, 17th October 2011 by Auw Jimmy

I always enjoy the beauty of vacuum tube, especially when the heater is glowing bright on thoriated tungsten tube and in a dimmed room. The photo below only taken for fun. I power up the EIMAC 8165/4-65A tube with 4x AA battery. The 6V filament glows, but I think due to limited current from the AA batteries, it can’t be as bright as normal. But even with the limited current, we still can enjoy the beauty of it…

More EIMAC tubes to follow…

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Tags: EIMAC, tube
Posted in Collectible Stuff | Comments (4)

Posted on Wednesday, 12th October 2011 by Auw Jimmy

Still remember the first chapter here? I have transferred the paper mockup into digital format. It didn’t take long time to do that

Just need to send (or print) this format and send to the manufacturer. I’m quite sure they can make one for me.

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Tags: Aikido, power supply, preamp, Prototype
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Posted on Wednesday, 12th October 2011 by Auw Jimmy

I ordered Duelund CAST Cu capacitor few months ago. I already have Duelund CAST Ag (Silver) on my Aikido Preamp. But I wanted Duelund CAST for my future amp (probably it’s gonna be another abandoned project?). As the CAST Ag price is very not reasonable (around US$2500 or more for a pair of 1 uF/630 VDC), then I think the CAST Cu is the best option (around US$ 1200 a pair). I also ordered my Alexander by Duelund capacitor (less than US$ 200 a pair of 0.47 uF/900 VDC), just to ‘finalized’ my passion on it (how bad it could be?).

After around 3 months or so production, finally the goods arrived on my home yesterday. When I opened it, I got a surprise. Duelund changed their chassis design for the CAST capacitor. See below.

I think the design is more likely a ‘small car battery’. Quite nice, since the new design is smaller and it’s ‘boxy’ design could fit on most PCB easily, compared with the old ‘moon cake’ chassis design.

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Tags: Capacitor, CAST Ag, CAST Cu, Duelund
Posted in Collectible Stuff, DIY Audio | Comments (5)

Posted on Tuesday, 11th October 2011 by Auw Jimmy

It’s interesting to hear how does this low end capacitor would sound. So I eventually try to obtain it. I just can’t stop my passion in this. Sigh…

Priced at very low value (just a little bit more expensive than Audio Note Mylar version), this Alexander capacitor from Duelund got ‘unique’ 900VDC rating. Based on its specification and capacitance availability, I’m quite sure this is more for electronic circuit instead of crossover.

Interesting to hear how does it sound. I also order the new version of Duelund CAST Cu capacitor. Although they are at different level, but at how much? That would be remained as question, until I try it.

All I need is some more time…

Tags: Alexander, Capacitor, Duelund
Posted in Collectible Stuff, DIY Audio | Comments (9)

Posted on Sunday, 9th October 2011 by Auw Jimmy

As my chassis has done few days ago, now it’s time to design the placement of the parts. I have mentioned before that the dimension was quite tight, so I wasn’t sure that I could fit all the parts on it. But without doing some prototyping, I couldn’t confirm that. So let’s start doing that.

My new chassis contains 3 chambers. One for the main transformer, one for the power supply section, and one for signal section. The size around 40×40 cm, more or less.

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Tags: chassis, design, layout, power supply, prototyping
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Posted on Thursday, 6th October 2011 by Auw Jimmy

I did a stupid mistake. I ordered new chassis, but during the construction, I changed some parts and forgot if the new parts actually ‘lot’ bigger than the old one. Two most significant in terms of the size are Hashimoto C-25-150CH and Tamura A-4004. They both occupy over half of the space (see the right chamber, on the size of copper plate). The copper plate itself will hold a giant custom Z11 power transformer.

I have to think how to solve this puzzle… re-order a new chassis would be my last, worst, but also simplest option…

See how things going soon… What you see below is not a ‘complete team’. I still have a pair of VCap and a Jensen 4pole electrolytic to join.

Tags: Aikido, chassis, preamp
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Posted on Monday, 19th September 2011 by Auw Jimmy

Last week, we held a simple DIY Blind Test session. The contenders were all Class A amplifier (we can see F5, J2, Aleph, TUMOS, and some others…)

This was a hot session. Not just because the contenders were very good and serious, but the Class A itself means high current (=hot) and big heatsink (=heavy). So? You can imagine the rest

Below is the preparation of the session. The speaker was DIY 3-way with Vifa driver (XT25, P17, and PL26). The CD Player was CEC, while the Preamp was Aikido. Enjoy some photos below!

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Tags: Aleph, Amplifier, Blind Test, Class A, F5, J2, TUMOS
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Posted on Sunday, 18th September 2011 by Auw Jimmy

As  my Sowter Choke Input was acquisitioned by my friend. Then I have to consider some replacement. Actually my friend was interested with Hashimoto or similar, but as most of the Choke Input was designed for power amp, instead of preamp, so the specification and requirement (especially for minimum current demand) were different.

Luckily, as my preamp uses quite big current, then I can consider some Choke Input for power amp usage. One of them is the Hashimoto C-25-150CH. This choke is designed for Input application, rated at 25 H and 200 mA maximum current. DCR is claimed around 205 Ohm. Spec wise, it’s all very good to best. As material, Hashimoto is quite confident with its Orient High B core (forget Permalloy or Amorphous). Internally, this choke should be a C-Core type, with extra electrostatic shield. Oh, Hashimoto also put extra work to make this choke as a magnetic shield type. I think they do understand that Choke Input could radiate enough flux and/or electromagnetic things. Definitely, a magnetic shield design will be a nice addition. Build quality of this choke is also quite superb. With around 2.4 Kg weight, this is a heavy weight championship (remember, this is only a choke!)

The second one is a Tamura A-4004. Although it’s rated only 10 H and 200 mA maximum (or 2.5 H at 400 mA), this choke only around 10% lighter than Hashimoto Choke Input above. Physically size, this Tamura also a little bit smaller than the Hashimoto. Before, I was considering A-4006 (Amorphous) also. But due to some other consideration (as my Aikido Preamp already has Duelund CAST Ag Silver Capacitor inside), then I think non-Amorphous core will give a nice combination with it. Right or wrong? We shall prove it later…

Tags: Choke, Choke Input, Hashimoto, power supply, Tamura
Posted in Collectible Stuff, DIY Audio | Comments (3)

Posted on Friday, 16th September 2011 by Auw Jimmy

“USB On-The-Go” is not really a new thing actually. But since I have ‘exiled’ myself from the glamorous gadget world, probably I have missed this one. So, I just acquire a Nokia E7, featured with USB On-The-Go. Basically, you can plug a standard device like keyboard, mouse, or flash drive on it (and get a flexible control over your supported device). But I would like to try a different approach. How if I plug standard USB Audio Device (USB sound card)?

I read somewhere that the maximum power supply current supported is 200 mA. Well, probably some USB sound card could take more. But, no risk, no gain, right? I check several of my USB sound card collection and start playing around. Btw, I also plug my Samsung MP3 Player. The idea is to copy some music file from it. But eventually it starts to charge the device itself (damned, charging from battery to battery?). My Nokia E7 “screams” by showing a warning message that the connected device is consuming a lot of power (or similar warning – sorry, forget the detail).

I plug my MAYA EX5 USB sound card. Nokia E7 recognizes the device, but it says ‘limited function’. I think because MAYA EX5 uses non-standard USB audio device (it’s multi channel which is not common in USB audio peripherals). Since I think it needs special driver, then the Nokia E7 couldn’t redirect the sound into this sound card. So, we remove this from our list.

Then I find out a standard USB sound card, the ASUS Xonar U1 USB. This sound card is quite nice, with adequate headphone output quality. Nokia E7 recognizes this device with no problem and suddenly the music is redirected into the ASUS Xonar U1. I plug my headphone then start to enjoy the music.

FYI, the ASUS Xonar U1 used on this and shown on the photo below has been modded completely, especially on the capacitor side with Black Gate and Elna Cerafine. Click the link to find out the modification detail. The sound has improved in quite significant margin.

Below is the Nokia E7 connected to the heavily modded ASUS Xonar U1 via “USB On-The-Go” feature.

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Tags: DAC, E7, MP3, Nokia, sound card, usb, USB On-The-Go, WAV
Posted in DIY Audio, IT/Gadget | Comments (5)