This Plinius 8150 had blown one channel of its output stages. The problem in repairing it was that the J Fets see are now obsolete-the last pair I found sold for £150! So I converted the output stages to use Hypex 400 watt per channel Class D modules. These sound great and are a big step up from the original output stages. In fact, if I wasn’t into valves I’d probably use a some myself . Very detailed and grain free, they’ve com a long way since the early days. Add that to cool running and low power consumption and you’ve got real 21st century amplification.
Below the output stage is under test.