I have the opportunity to buy a Trace Elliot Quatra head for what may be a very reasonable price. I know that it is a 200watt all tube head with a very clean sound, and that it may be fixed bias like Mesa(not sure on that). I will not be able to hear it before purchase so I would welcome any feedback from you guys. My main amp is a Mesa 400+ so I would be keen to know if the Trace sounds similar or very different. There does not seem to be much point in buying it if the Mesa covers the same sound. I am familiar with the traditional Trace Elliot sound from their transistor amps but not their tube amps. Any opinions and experiences would be welcome. Thanks guys.