The EL84s sound pretty close to 6V6s at times. I had a Hughes & Ketner Statesman 2 x EL84 combo prior to my 2 x 6V6 Two Rock and both can give that 'chimey' sound that's hard to get with other valve types. The Vox AC30 is the epitome of the EL84 sound, though with different circuitry, it can make all sorts of different noises.