PROTON D540 vintage high current stereo amplifier (ex-cond). 

If you are looking at this listing, then you know the cult status this amplifier has among hi-fi enthusiasts and its enormous power capabilities. 
Please check photos carefully as it represents the condition of the item. There are very minimal marks on chassis and front panel and very clean throughout.
However, from memory, the L channel was occasionally intermittent until warmed up. I have been told that this should be easily resolved with a good inside clean or professional service. Otherwise, everything is in working order (and sold as-is).

Please see description/specs from internet:

Description
The Proton D540 is a high current integrated amplifier which has been carefully developed with complete emphasis on the quality of sound.

Whether adding to an existing audio or video system, or as part of an all new system, you are certain to notice the clarity, detail and depth of performance which make Proton products among the best in the world, regardless of price.

Specifications
Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.02%

Damping factor: 90

Input sensitivity: 0.2mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 75dB (MC), 92dB (MM), 105dB (line)

Dimensions: 420 x 87 x 320mm

Weight: 8.7kg

Proton D540 Integrated Amplifier Review price specs - Hi-Fi Classic (hifi-classic.net)

Note that this is a heavy piece of equipment (but will be packed well to ensure safe delivery)