Stereo Tube Amplifier Enclosure

I have noted that high impedance of the S5 LS Tube Amplifier causes noise at output. I can hear "humm" and a little bit of high frequency noise in the speaker when the volume is at the high range.

The "humm" can be caused by a ripple of the power source, or by a coupling of the high impedance circuit with an external AC voltage. The high frequency noise suggest that a shield is needed.

I tried build some shield for the tube amp circuit with metal (aluminum) sheets. I have noted that the noise reduces significantly, but metal sheets are not functional. The shield should be visually pleasing too.

At the S5 Electronics web site you can find a enclosure specially designed to S5 LS Tube Amp.

I ordered this enclosure. In a few minutes you can mount the Tube Amp inside the enclosure. Some pics below.

The noise (humm and high frequency noice) was almost eliminated with the shield implemented by the enclosure. Good results!