If the engineer can't figure out what he is looking at, you have the wrong engineer. The circuit is straight forward tube design, each tube is independent but has a common power suppy. You likely have a screen resistor blown from a crap tube, that is about the only thing that can go wrong.
VTL MB450 Schematic
I have a pair of VTL MB450 signature monoblocks. Has anybody got a copy of the circuit schematic ? I have been trying to contact VTL but getting no response. From reading some of the threads this is not unusual ! One of the amps is in for repair and the schematic would assist the engineer.
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Most VTL and other push pull tube amps are loosely based on the Williamson push/pull amp circuit, if the tech is experienced he shouldn't need it. https://www.google.com.au/search?q=Williamson+Tube+Amp+circuit&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi-8oOvlsvQAhUJ-mMKHQiOCEEQ_AUICCgB&biw=1680&bih=933 Cheers George |
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