(For an in-depth look at the subject, read All the Worlds a Gain Stage. V4 and V5 - EL84 power tubes there seems to be little consensus as to which modern EL84 are best, so pick your poisonĪll of these tubes are cathode-biased, so you can replace and power up without needing to adjust bias, etc. is arguably the most significant factor in shaping the character of any classic or modern guitar amp.
V3 - 12AX7 closest to the power tubes, this is the split-tail phase inverter Sovtek 12AX7A, Sovtek 12AX7B, all JJ versions and all Chinese versions and all NOS versions should work fine V2 (ECC83/12AX7) 2nd stage both channels preamp tube. Example of a JTM45 or clone: V1 (ECC83/12AX7) 1st stage normal channel and 1st stage bright channel preamp tube. Because of the the CF use, some of the Russian New Sensor 12AX7 with spiral filaments will die early here (Sovtek 12AX7LPS, Electro Harmonix 12AX7EH, Toug Sol 12AX7, Mullard 12AX7, etc). In most cases the tubes are numbered from V1 first stage (s) to Vn last power tube or rectifier tube. V2 - Next 12AX7, it's the 2nd gain stage for the Top Boost preamp and the cathode follower stage that drives the Top Boost tone stack. This last pre-amp tube is acting as a phase inverter as mentioned above. This is the most important tube noise-wise (and tone-wise), which is why it's in the metal shield. If the other pre-amp tubes are balanced as well, thats fine but they dont need to be. This is the first gain stage for both the Normal and Top Boost channel. Each 12AX7 is two triodes in one envelope.
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