On Wed, 14 Jan 2009 16:22:39 -0000, "N_Cook" wrote:


So normal, in summary, for this amp?
The "brilliant" half is upper in this section of schematic
http://home.graffiti.net/diverse:graffiti.net/vox1.jpg

Yes - that is the circuit I have.
There is treble control but not bass control with "normal" input and zero on
brill vol.
Unless there is signal (e.g. from guitar) through the brilliant circuit then
neither bass nor treble should really have any effect.
The position of the brilliant volume control should not affect the normal path.
Is it possible that C10 - the common cathode decoupling of the first valve is
failing and letting some signal through from the normal to brilliant section?

--
Geo