Help!! 6AQ5 SE amp

[aster peter99]

I want to add this tone control on this circuit.

Can I do it this way?( is the amplification rate too low?)
And I want to add direct function(don't pass the tone control circuit) i know it is unnecessary on this circuit( when the knob is on the middle, it works like direct function) it is for experimental reason, I want to know the effect of the capacitors of the tone control circuit on sound quality. So can I just add the switch on the input(like upper schematic) or should I add one more switch before the grid input(because i thought 12ax7 on the tone control could cause noise)(like lower schematic)

I am sorry for poor English.... can anyone help with these problem?

 

[picowallspeaker]

hi, you omitted one 12Ax7! By doing that, you omitted the coupling cap and, if you want pure sound, you don't want all the tone control net of components to sit from the input to the anode of the 12 AX7.
The two stages ( tone control and amplifier) must stay separated. I'd rather have a solid state line stage ( bjts-fets-ics) and a tube power stage, than all tubes.

 

[Tom Bavis]

A cathode follower doesn't really do anything if you're using low-impedance sources - though as drawn it has no B+, so won't even pass a signal. Combining the stages won't work - the driver stage needs some gain, will have none due to feedback through the tone controls. The input cathode follower does isolate the effect of source impedance on the tone controls, so you'll want it if any of your sources is high impedance.

I would use a gain stage, then a passive Baxendall tone control, and switch between its output and the volume control to the driver, saving a 12AX7. The gain stage can be adjusted to cancel the loss of the tone controls.