i set the sound with the volume and tone of the guitar totally open get with the discrete amp settings with optimal range of frequencies in treble and middle , but when i go down with the volume of guitar, even slightly, the sound becomes quite dark losing most of the treeble ! could be the filter capacitors ..... perhaps to be renewed ???!!!???
this is the schematic for someone who wants to give me advice on any mod or integration ..... http://www.blueguitar.org/new/schem/fen ... eville.gif
PS: precisely that the amplifier has just been retube.so there's no problem with tubes ... or guitar.