[quote name='TraceAmp' timestamp='1388678186' post='2324711']
Yepp, that is true. I found out, that the CTM15 dont like high output active basses. I play a Music Man Reflex with high output and the CTM15 with gain full ccw. With only a litte bit of gain the sound goes more middle and treble way...
With no gain and master, there is a little hum, but not dramatically.
On page 7 at the [url="http://ashdownmusic.com/files/product/file/user_manual_20130911060258_28463.pdf"]manual[/url] are the info, that it is a "Automatic BIAS for Plug&Play Easy Valve Replacement"... I dont know exactly, what the preamp valve do for a job.:
Is the only 12ax7 (on pic "V1") valve a phase inverter? It seemed, that the preamp is SS, not tube driven... Or what?
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The opamps on the right of the first picture would certainly suggest that the ctm15 isn't all valve... That's a bit naughty, but I'll reserve judgement til I play one. Wouldn't put me off too much, especially with the drophead 15 looking so damn cute. More likely to be put off by the 10" speaker! Also confused/intrigued by the unused valve spot...