300B Amplifier Build Based On Luxman MQ-300

This 300B amplifier build is coming far earlier than expected.

This amplifier build was initiated around 6 months ago. Then it starting from sourcing the major components such as the amplifier case, tube sockets, resistors, capacitors and the tubes itself. All of them are mostly imported and with a long waited, they've just arrived two weeks ago. The other key components such as output transformer, power transformer and choke required a week to custom made based on this 300B amplifier schematic and idea.

It is very common when building an amplifier from a scratch like this, there is an issue appears after it complete. Most common issue is the hum. This annoying hum can ruin my time to troubleshoot it. Especially when building 300B amplifier, hum is mostly present at the speaker output. But this project is different. This 300B amplifier is finished without the annoying hum issue. This amplifier working like a charm since the first time it powering ON.

And the sound is really good.

The Finishing Touch For My Luxman LXV-OT7 Clone

I am visiting this Luxman LXV-OT7 clone for the finishing touch.

From the time this amplifier project finished, some of the parts are using what I have left in my bin. This amplifier is working fine but just not perfect. So, after my imported components came last week, I start to open this amplifier again. Those components that need to replace are RCA female plugs and potentiometer.

Elekit TU-8900 Components Upgrade & The Reason I Sold it

Here we go for tube amplifier again!

I have this Elekit TU-8900 amplifier for a short time before I sold it. I was enjoying the music with this amplifier for quite a while, and I can say this amplifier is powerful enough to drive my 86 dB sensitivity speakers with lots of dynamic and bass slam.

This Elekit TU-8900 is popular because it is the cheapest 300B or 2A3 amplifier that still made in Japan. This amplifier was coming as a kit, meaning you should install it by your own with the included manual and all parts scattered. Since I bought it second hand, it is assembled from the previous owner already.

In this post, I don't think I would add the same review again because you can find many good reviews about this amplifier everywhere. What I will share to you is actually there are few components that can be easily upgrade for the better sound.

Let's check it out.