Thanks for the heads up @milpai I will have to do some experimenting with that myself.
I have swapped the stock Mullards for a matched pair of Mazda Cifte 12AU7, after being so impressed with the Cifte's in my Rogue CM2. I have found the Ciftes seem to really magnify everything the Rhumba Extreme does well - they are a good compliment to the airy top end, pinpoint accurate stereo field, and authoritative bottom end without changing the sonic character of the sound in any way.
I will pull off the tube rings this weekend and see what kind of difference it makes. I'm curious to compare; the preamp is already using terracones, sitting on a butcher board, which is sitting on 3 IsoAcoustic Indigo Oreas so I wonder what difference the stabilizers are even making at this point.
I have swapped the stock Mullards for a matched pair of Mazda Cifte 12AU7, after being so impressed with the Cifte's in my Rogue CM2. I have found the Ciftes seem to really magnify everything the Rhumba Extreme does well - they are a good compliment to the airy top end, pinpoint accurate stereo field, and authoritative bottom end without changing the sonic character of the sound in any way.
I will pull off the tube rings this weekend and see what kind of difference it makes. I'm curious to compare; the preamp is already using terracones, sitting on a butcher board, which is sitting on 3 IsoAcoustic Indigo Oreas so I wonder what difference the stabilizers are even making at this point.