I will defer to some of our more astute tubeologysts on that one. I believe the 7802 drops the impedance farther than either the 421a or the 5998, but don't quote me on that. Perhaps @L0rdGwyn can clarify?
The output impedance is slightly lower than the 5998 or 421A by 2ohms or so. Not a massive difference, but the higher transconductance is definitely reflected in the sound. Output impedance with 5998 around 32 ohms, with 6AS7G or 6080 around 50ohms.
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