Posted on Tuesday, 30th August 2011 by Auw Jimmy

One of must have software when simulating power supply is PSU Designer II or PSUD II. This amazing freeware could simulate your power supply behavior, before you start to assembly your circuit. Off course, not all looked good means good for ears, but at least we can try

Below is my current Aikido PreAmp power supply circuit. The rectifier actually should be RGN, but I can’t find it on the list. So let’s roll with similar one, the common 5U4-GB.

The chokes are various from Sowter, Electra-Print, and Lundahl. Plan to take another amorphous one from Tamura, but we’ll see. Capacitor also varies, with V-Cap, Jensen, ASC, and the last minute acquisition, Black Gate WKz.

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Tags: power supply, PSUD, tube
Posted in DIY Audio | Comments (3)

Posted on Tuesday, 30th August 2011 by Auw Jimmy

I have been a fan for Black Gate for quite long time. My first time impression probably nearly 10 years ago. I forgot whether I heard SKz or WKz at that moment, but I did remember the beauty of tube amplifier, smoothed by those Black Gate (probably not just Black Gate who contributed for the amazing sonic at that moment).

But 10 years back, I didn’t dare to play hundred of Volts for designing tube based equipment, then high voltage Black Gate such as SKz or WKz was out of my consideration. I got some and sell some… Mostly, I preferred to play with NX series, which very common in low voltage application (as low as 6.3 Volts). Very useful in D/A application. Some people say the Black Gate NX (especially the HQ – High Quality version) is very good in D/A coupling application. It produces very neutral sound, transparent, almost nothing (like direct coupling). But some people don’t like this kind of ‘sterile’ sound. Not analog, some people complaint.

Actually, other best application for Black Gate NX series is on the power supply smoothing section, especially on the D/A side.

I still own several N/NX/Hi-Q series, FK series, F series, PK series, Standard series, C series, and off course, the latest acquisition, SKz/WKz series.

All the latest WKz series (not WK, SK or SKz) will have a green ‘Goddess playing harps’ and  ‘Heart of Muse’ text. Actually, Black Gate is not the only one who uses ‘Muse’ in their capacitor series. We also can find Nichicon who uses ‘Muse’ in their line up. Term ‘Muse’ itself (one of them) could refer to any of 9 daughter of Mnemosyne and Zeus. Still on the same mythology, each of the Goddess possesses specific art or science. Probably this one loves music…

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Tags: Black Gate, Capacitor, SK, SKz, WKz
Posted in Collectible Stuff, DIY Audio | Comments (7)

Posted on Tuesday, 16th August 2011 by Auw Jimmy

Some people send me an email asking about how to measure cathode current and resistor rating. I will show you how to do it and actually this way is not only applicable for cathode resistor (but commonly used for that purpose).

Basically, there is 2 common way to do it. First, put you Ampere meter in series with the resistor. Second, is to measure the voltage on the resistor, then calculate the current based on the Voltage, Current, and Resistance formula (which V=I*R).

For the sake of simplicity, we can opt to use the second method. We cut the shrink from the resistor pins and put the probes there.

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Tags: bias, cathode resistor, Sanwa
Posted in DIY Audio, Measurement | Comments (2)

Posted on Tuesday, 16th August 2011 by Auw Jimmy

Sometime I’m curious how hot your tube is? Well, this short experiment will give you some idea. Different tube may have different thermal characteristic (simple logic: the higher current on the filament, expect higher temperature).

Off course we can use probe to measure the surface temperature. But I’m thinking another approach. So I get myself an infrared thermometer to examine the temperature in more detail. As example, I use Russia 5U4 Rectifier tube, rated at around 2A filament.

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Tags: 5U4, infrared thermometer, rectifier, tube temperature
Posted in DIY Audio, Measurement | Comments (1)