I've been told by ARC that 6550 and 6H30 in ARC preamp power supply section last only 2000 hours,
while the rest of 6H30s in audio circuit will last 5000 hours . I'm not quire sure about 6H30 in power supply,
I might remember incorrectly, but I'm Sure they said 6550 lasts 2000 hrs.
Is this correct ? Because I don't see something about shorter life of preamp power supply tubes in their
Can you please clarify this for me ?