Following the spate of bad luck lately (will's Teac, Powerblock, Lordsummit's deck), it's my turn... So, a comparative listening test against the latest prototype from work and my S300 (and because until about 4 weeks time, we haven't got a place at work for listening tests). Ran a whole load of stuff on the prototype, changing a few settings, different components in places, etc and had an idea of where we're at. Swapped back to the S300. Pop. White smoke. The death of at least one Sanken 2SA2922 Bipolar transistor. It is possible that there was a speaker output short, but there was no protection intervention, etc... So, £19 for four new transistors (replacing all 4, 2 NPN 2SA2922 and 2 PNP 2SA1218). Dammit.