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...... Read More

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...... Read More

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)...... Read More

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...... Read More

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....... Read More

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...... Read More

“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...... Read More

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...... Read More

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...... Read More

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...... Read More

Last upgrade, the switches. Basically, in most tube application, we will use two switches. The first is the main switch which will control the main AC voltage to supply the...... Read More

Not yet finished chassis. Quite huge for a preamp, around 42×42 cm in size. Some copper sheet shown on the picture for some section on the top plate.... Read More