Why you need Power Scaling™ and a Master Volume.  This is nowhere near full volume but you can tell how loud it is compared to my voice.  It's too loud for most people to play at home and it's still not breaking up much.

(Tony) Neck pickup

Clean sound at low volume.

(Mark) Neck pickup

Pre-amp distortion at low volume.

You can make it quieter or louder with the Master Volume control and get less break up by changing the Voice, Gain and Volume controls.

(Mark) Neck pickup
(Mark) Bridge pickup

Output tube distortion at low volume using Power Scaling™.

You can get more or less distortion than this and at higher and lower volumes by adjusting the Power Scale, Volume, Master Volume, Voice and Gain switches.  The final sound is a combination of all the controls on the amp plus, of course, the way you play and your guitar/pickups.

(Mark) Neck pickup

(Mark) Bridge pickup

Output tube distortion at very low volume using Power Scaling™.

You can hear the guitar strings.

(Mark) Bridge pickup

(Mark) Rock Style - Bridge Pickup

Fender Champ 600 Sound Clips

The clips were made with a modified Fender Champ 600 amp with a Master Volume control extra (see Items for Sale) using a Samson USB mic and a US Fender Strat with Lindy Fralin Blues pickups.

Clean sound at low volume.
The AA764 tone has improved components but is the stock tone circuit.  The 5E1 tone has much higher gain and a more open sound (to my ear) than the AA764.  They are recorded at the same volume i.e. the volume control is turned down on the 5E1 clip.

(Mark) AA764 tone stack - neck pickup

(Mark) 5E1 tone stack neck - pickup

Bluesy Crunch at low volume.

You can make it quieter or louder with the Master Volume control and get less break up by changing the Volume control.  The Champ is not a high gain monster so if you want a LOT of distortion this may not be the amp for you - a Valve Junior may be more what you're looking for.

(Mark) 5E1 tone stack - neck pickup