Even though the Bugera v5 infinium is only 5w, have you tried simply connecting the V5 to the Marshall speakers directly? Assuming the back is open..


Another option is to use a direct box (DB) off the V5... with output of the DB going to the input of the Marshall. The only issue here is to be sure ALL volume controls are turned DOWN. Then, you want to set the Marshall for a clean channel and slowly turn up both amps until you have the tone from the V5....and the volume you want from the Marshall. DB's are used all the time professionally to capture bass, guitars, keyboards and get them cleanly and safely into a mixer.

It's really the safest way to do this job.

If you are playing a live gig, I can understand the need for the volume. If however, you are recording, you don't need the volume. I have heard little one watt amps sound better than a Marshall Stack, recorded. None of my guitar parts are recorded loudly. Many are very quiet in the room. Including when I use my Boogie. It has the power to handle a stage show, but sounds really good turned down low.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.