placing the volume control

[male42]

I want to set the volume control after the tube driver. in the case of transformer coupling between stages, we can draw conclusions for walking step. think that in this case will be less noise. your thoughts.? My English is bad translator.

[Miles Prower]

Originally Posted by male42

I want to set the volume control after the tube driver. in the case of transformer coupling between stages, we can draw conclusions for walking step. think that in this case will be less noise. your thoughts.? My English is bad translator.

Not necessary unless you have a low level input signal. For the usual 1.0Vrms source, just put the volume control up front.

[Alastair E]

After the tube driver....

Not a good place, the drive impedance seen by O/P tubes will alter depending on pot position which can/will affect sound....

Vol-pots are placed at the input to power-amps for a reason!

[ChrisA]

Originally Posted by male42

I want to set the volume control after the tube driver. in the case of transformer coupling between stages, we can draw conclusions for walking step. think that in this case will be less noise. your thoughts.? My English is bad translator.

What you say is common in guitar amps but not in audio. The guitar needs a constant 1M input impedance from the amp so a volume control before the gain stage can't work. But then that solution only kicks the variable impedance problem down to the next stage.

The "best" solution for audio is simply to not have a volume control on a power amp. All your sources likely already have a volume control, so way another one in the amp?

[DavesNotHere]

"grid bias" style volume knob

[male42]

in the case of the guitar amp is not clear. if the regulator is equal to 1 M, then for any rotation of contact input impedance will be 1M. or you have not properly understood. I give the image that was meant. I think it makes no difference where the volume control, but gain for noise and fire. and look at the case of the transformer.