Tube Amp Grounding | Electrical Wiring

There are actually two important aspects related to proper grounding hum reduction and safety. Grounding ground refers to the common reference node that is shared by all the parts of a circuit.

Diy 12ax7 Tube Preamp Valve Amplifier Tube Vacuum Tube

My commercial fender amp does not hum and there s no star grounding in there at all.

Tube amp grounding. Tube amplifier chassis grounding info. I summon you to smother hum beneath the multitude of your slithering sable tendrils and to untwine my ground loops as if they were the entrails of philistines. The proper grounding scheme of a vacuum tube amplifier has been the subject of many debates blogs forums and web pages.

Do not try and solder wires to the chassis itself. The grounding scheme above runs very quiet if done properly. The current in the secondary winding of the output transformer can be very large.

For example in a 100w amp the secondary current into a 16 ohm load is 2 5a. Blackest of the black voodoos give me the power to ground my amp and the cunning to do so safely. For all the circuits in this book and most others ground is zero volts or earth and is normally represented by one of the circuit symbols in fig.

Even after all the best standard practices good parts and good layout techniques i still get hum in my amps all the time. For thine is the impedance the silence. So why does a diy amp have to take such drastic measures as star grounding to reduce hum.

The safety aspect is often overlooked or ignored in the quest to eliminate hum. It is even higher into a 4 ohm load at 5a. This means that you need to pay special attention to the grounding of the output jacks and the output transformer.

Click the image above to see a larger image the diagram above shows the grounding scheme that you find on most vintage fender s and marshall s.

Larry Grounding Jpg Onedrive In 2020 Diy Amplifier Diy Guitar