If you can forgive the Beezz for being brief. Just threw a number of AX7's in my Balls M-18 to compare the tone with just jamming and listening. Tubes used were in a sets of three of the same brand in V1, V2, and V3. Tubes I used for this Test. JJ ECC803 Long Plate JJ ECC83 Short Plate Ruby Higrade Short Plate EH Short Plate Sovtek LPS Long Plate Tung Sol Short Plate (reissue) GT 12AX7M Long Plate (reissue) NOS Mullard Long Plate IEC Branded (slightly used) I played all of these Tubes in the same amp with the same settings. Balls M-18 18 watt 2x12 Combo through Channel 1 with the Volume set on Dimed and the Tone Control the same. I listened for both Clean sounds and Raging Dirty sounds using my 52 reissue Tele and only using the guitars volume control for cleans to dirty sounds. As I said this is gonna be a brief review just concentrating on the things that stand out about these tubes. No Cork Sniffy stuff here. JJ ECC83 Clean - Warm Sweet Cleans Dirty - Not bright enuff for my Taste but not Fizzy JJ ECC803 Clean - Lots of spank and very sparkling Dirty - Too Fizzy for my taste Tung Sol Clean - Bright Chimey less Bass than others Dirty - Too Fizzy for my Taste Sovtek LPS Clean - Punchy Low End Dirty - Very Smooth a little Microphonic EH Clean - Very Similar to the Tung Sols Dirty - Very Meaty Very Bad Microphonic Ring Ruby High Grade Clean - Warm Round Slightly Microphonic (very unusuall looking tube on the inside.) Dirty - Warm GT M's Clean - Just like Sovteks Dirty - Just like Sovteks Brand new right out of the box Motor Boating. Mullard ECC83 Clean - Spanky 3D Dirty - Absolute best Dirty Sound of all the Tubes Overall I would say all of these had some attributes that were good and some better than others. If one could pick the combinations and combine them one could be very happy. Such as maybe a Tung Sol in V1 and two Sovtek LPS's in V2 and V3. I'll have to try some combinations and check back in later on that. As a side all these Tubes excluding the real Mullards were Brand New and purchased from a dealer who checks them. Not all from the same Dealer.