Phono preamp 2

 Up till now, a diy assembly preamp has been used with the B&O turntable. Yesterday, I decided to listen to some vInyl LPs in my media collection.

There has always been a problem with hum and rumble in the preamp. I had problems in the assembly which may account for the noise. There weren't enough ground wires in the unit. I added a couple. 

The noise varied with physical location and that points to shielding as the problem. In fact, there is no shielding, only ground wiring connecting the system.

There were three possibilities of a solution:

1.) But a new unit ( Behringer Microphono PP400).

2.) Add shielding to the existing unit.

3.) Replace the existing unit's plastic box with a metal box connected to ground.

The existing unit is supposed to be an excellent design so a new box is in order. However, I would like to listen to some music and also verify the source of the noise, hence a Behringer Microphono PP400 is on order and will arrive in a few days. A replacement box for the existing unit will be found and eventually ordered.


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