The reason for the standby switch... Tubes have to reach an "operating temperature" which is just known as warm... when setting the amp up you cut it on first and leave it on "standby" to preheat the tubes. when stepping down between sets you put it back on standby to keep the tunes warm.
Then there is the point of "Overdriving" tubes. You get two different sounds:
Overdriven Preamp tubes have a nice fuzz to them, very midrangy.
Overdriven Power tubes have a clarity I prefer...
In the case of your amp I think you have two tubes that govern the "gain" of the clean channel. If you replace only those tubes (with less powerful tubes) it will reduce the gain on that channel only, leaving the other channel and power section sounding the same as before.
The Peavey Forum will help you know which tubes govern the clean channel and what some good selections for lower gain would be.
Then there is the point of "Overdriving" tubes. You get two different sounds:
Overdriven Preamp tubes have a nice fuzz to them, very midrangy.
Overdriven Power tubes have a clarity I prefer...
In the case of your amp I think you have two tubes that govern the "gain" of the clean channel. If you replace only those tubes (with less powerful tubes) it will reduce the gain on that channel only, leaving the other channel and power section sounding the same as before.
The Peavey Forum will help you know which tubes govern the clean channel and what some good selections for lower gain would be.