Hello, learning about tube amps still. It took three years but starting to sink in. Some tube rolling and turning off the effect pedals and just digging in. But, my question is, is the el84 polam/telam the same, and how does it compare to a tungsram el84. I've read a power tube is just a power tube. Well, in my simple ac4tv just plug and play, there are great differences between them. Tungsten sol, could not use. Noise and chords all over the place. Mullard, chords better, but noisy again. Nos tungsram, wow. Back to my question though. $$ matters right now so experimental buys are not a good option for me. Like what I got, but like to tube roll. Its fun. Like getting a new different amp for the price of a tube.