This is a very nice and rare Marshall PB100 Power Brake Attenuator made in 1990's in England.

It is used and shows some scratches and wear but is fully functional and in very good overall condition.

Overview:

Marshall Power Brake is an attenuator that allows you to control the volume level of your amplifier in eleven 3dB switchable stages. This effectively can take you from stage, through studio, down to bedroom practice volume, with the unique tone created by driving at full power. Marshall Power Brake will not "strangle" the natural tone of the amplifier and the 3dB steps give you smooth control of the power settings for every situation.

Specs:

Power handling: 100 W

Impedance: 8 Ω / 16 Ω, selectable

Attenuation: 11 steps, in 3 dB increments

Maximum attenuation: −30 dB on the standard scale

Silent operation: Yes, using the 12th-position load setting

Input: 1 × amplifier input

Speaker outputs: 2 × 1/4-inch speaker jacks

Cooling: Self-powered, variable-speed fan

Load type: Inductive/reactive load

Power supply: No external power required

Dimensions (W × H × D): Approximately 225 × 120 × 200 mm

Weight: Approximately 4.8 kg