I was looking through the latest audio advisor mag and was interested in the vincent sp-331 power amp, has a tube input stage with a solid state output. The thing is that the tubes are 6N16, which are a small Chinese variety. In addition to this they are hardwired to the circuit board and if they need to be replaced I was told the unit would have to be sent to the service center in Michigan. I did a google on 6n16 tubes and found nothing except that they appear to be used only in vincent products. Not all vincent products use the 6n16, I believe their top of the line cdp uses a "standard" sized tube. The gear looks nice, I did not ask about warranty length.
