Best sample out of 10 burnt-in triode systems. Note the re-adjusted gridcurrent model. It is more accurate below approximately 100uA compared to the old 12AX7.TSi4 model. To distinguish the new from the old model without enlarge the suffix, I replaced the "i" by an "r" which means "re-adjusted". I apologize for the not so well fitted 12AX7.TSi4 model.
This triode offers both high mu and high gm, with still quite moderate heating requirements. Note that it is designed for grounded grid configuration, so the usage in standard configuration might show a significant high input capasitance.
This model is based on the most representative triode out of 5 tubes, all burnt-in for 100 hours. Note that this tube turned out as quite linear (with an exponent of only 1.37) when used below Va=100V.
This triode has the same long plate construction as the NOS Telefunken ECC82 (plate length is approx. 15mm), and seems to be of quite similar construction like the JJ ECC802S. link to the .subckt E82CC file
This model is based on the most representive sample out of 5 tubes, each burntin for 100h. So far, all electrode constructions I have seen were identical regardless of the brand. So, the suffix is shortened as the both letters for the manufacturer is not needed for this tube.