Скачать с ютуб Peavey VB-2 Why is my Tube Amp Humming/Buzzing? - Replace the Power Supply Filter Capacitors! в хорошем качестве

Peavey VB-2 Why is my Tube Amp Humming/Buzzing? - Replace the Power Supply Filter Capacitors!

My apologies I was not able to take more video showing the process of replacing the capacitors. I have specialized tools I use in many of my electronics projects to make the process easier than with regular soldering tools. Recapping a tube amplifier should NOT be done by any novice. There are dangerous high voltages inside the amp that can KILL you, or at the very least give you one hell of a shock! Doing work on my Peavey VB-2 All Tube bass amp. I had changed out all of the valves inside a few months ago and it really brought this amplifier back from the dead. I quickly realized that I was getting a nasty 120 hertz buzzing that I could not get rid of with the volume knob. Being that the amplifier is over 15 years old at this point I should have replaced all the power supply capacitors when I had it apart a few months ago. The 120 hertz buzzing I immediately knew that the filter capacitors were starting to wear out to the point of failure. I ordered an entire set of Nichicon caps to replace the old Illinois Capacitors this amp came stock with. The final results speaks for itself. Very happy with how it turned out. The minor buzzing noise left over is not filter capacitor noise but a design flaw of the amp. The effects loop is passive and not buffered by opamps. The master volume is also not driving an op-amp, instead it goes directly to the phase inverter valve. as a result of the high impedance of the master volume knob when set to 5 (middle of its travel) this can pick up the buzzing sound that you hear. its called High Impedance Coupling effect The solution is to use an external buffer on the effects loop to keep the impedance from the preamp to the PI tube of the power amp low. This will prevent the circuit from picking up the noise.