what features does studio and recording amp need?
1. lower noise.Recording amp need lower noise and hum
2.smaller watt. You don't need larger watt like stage
3. About guitar , The speaker size is 12 inch, It is best size for guitar.
Do you have other advices, please tell me Thanks
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The sound of a guitar stack can not be achieved with a small combo, adjust your stack at max put a akg 414 at a meter distance, pad -10 db, close the recorder room and root your guitar signal through the console thru the amp and listen to it at you studio monitors. The sound can not be achieved wit an 12 inch driver. It all depens what you wanne hear at the end. There are no rules in audio just diffrent tastes

I'll have to agree with audioph14, you will not get a Marshall® stack sound out of a combo. However, you can get a good tone out of an Epiphone Valve Jr. combo. The 5 watt output with a good pedal in front of it will give you some really great rock tones, or just use the tube amp tone to drive a good clean sound with a little breakup. The 5w output means you won't get evicted/divorced/shunned by the people around you but you'll still be able to drive the speaker hard enough to get the right guitar sounds even through the 8" speaker.

Position a good mic (SM57, AKG 414, MXL 990, etc.) in front of the speaker cone and adjust for the tone you want to track.

I have a couple of friends who are gigging that use this as their live rig by dialing in their tone in the studio then taking it to the gig and mic'ing it into the board. Then they simply use the amp as their monitor on stage. Plus it is a lot easier to haul in and out of a gig than a full or half stack...

But, this is simply an opinion. Good guitar tone, as you are most likely aware, is a matter of personal taste and playing style.

I hope this helps.

peace