The 3130 is basically a higher power version of the 3020. However it does suffer from failing electrolytics and badly intermittent switches throughout with age. The basic fixed price overhaul for the 3130 is £165 and this covers thorough inspection and fault diagnosis followed by overhaul of all switches and potentiometers. For an additional cost to the above of £55 all electrolytics are replaced with Nichicon audio grade components. This latter option is particularly essential if your example has the grey 'YEC' branded components which are almost always found in a very poor condition.