Generally I have not seen much info on these tubes so I bought one to try. To get the bad out of the way, sadly the Mullard RI does not sound like a real Mullard. If you buy one on those grounds you will be dissapointed.
Other than the cheap marketing tricks, the Mullard RI is a good tube. Its sound is along the lines of the Tungsol RI. It is clear and detailed and pretty well balanced, but has a little less sparkle. I tried it in my DRRI and botht he clean and gain sides of my ED. The Tungsol's went back into all the clean channel slots. The Mullard RI ended up staying in one of the vintage gain stages as it helped fatten up the tone and drops a little of the harshness.
In comparision to say a good old JJ that most people have heard I'd say the Mullard has more life and is less stiff sounding. Its definately a more interesting tube for both clean and overdrive.
Other than the cheap marketing tricks, the Mullard RI is a good tube. Its sound is along the lines of the Tungsol RI. It is clear and detailed and pretty well balanced, but has a little less sparkle. I tried it in my DRRI and botht he clean and gain sides of my ED. The Tungsol's went back into all the clean channel slots. The Mullard RI ended up staying in one of the vintage gain stages as it helped fatten up the tone and drops a little of the harshness.
In comparision to say a good old JJ that most people have heard I'd say the Mullard has more life and is less stiff sounding. Its definately a more interesting tube for both clean and overdrive.