Part 1: The road to the UpX-4 (2011)
by John Paul Chacha on Wed, 5th Sep 2018. Read 10539 times.
The year is 2011 and I'm building the amplifier to rule them all. It's called the UpX-4 Multimedia Utility Amplifier and it's based on my “pump-mode amplifier” configuration.
The amplifier is made up of a low-power section called the UP-Core and a high-power section called the UP-Pump. The next two images show the core being put together. I had to do this three times before I finally got it right (the other iterations were unstable).
A big amp requires a big transformer and beefy transistors. After a lot of experimentation which may or may not have included driving the transistors to their maximum ratings, I finally settled on the RCA TO3 transistors (I don't remember the part number, but they're rated at 160 VCEO and 16 A IC.
8mm of glowing perspex for the looks...
Construction of the pump section. I use acive droppers – expensive but very effective. I suspect that I'm the only person on earth who does that.
Input module.
All the compnents mounted and ready to go.
Here's the final product:
The year is 2011 and I'm building the amplifier to rule them all. It's called the UpX-4 Multimedia Utility Amplifier and it's based on my “pump-mode amplifier” configuration.
The Build
The amplifier is made up of a low-power section called the UP-Core and a high-power section called the UP-Pump. The next two images show the core being put together. I had to do this three times before I finally got it right (the other iterations were unstable).
A big amp requires a big transformer and beefy transistors. After a lot of experimentation which may or may not have included driving the transistors to their maximum ratings, I finally settled on the RCA TO3 transistors (I don't remember the part number, but they're rated at 160 VCEO and 16 A IC.
8mm of glowing perspex for the looks...
Construction of the pump section. I use acive droppers – expensive but very effective. I suspect that I'm the only person on earth who does that.
Input module.
All the compnents mounted and ready to go.
Here's the final product:
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