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Audio Research REF3 tube question clarification


Audio Research REF3 kindly clarify.

Do the 5 Sovtek 6H30PI tubes have to be all matched to get the best sonic performance?

What do the 5 tubes actually control?

Hours on tubes, when should they be changed to get the BEST sonic performance as there seems to be different opinions.

Sovtek 5 tubes, some say change them up to 1600-1800 hours but other sugest 3000 hours, which is it?

Winged "C" (SED) 6550C tube, some say change up to 800 hours but others sugest 3000 hours, which is it?
dev

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dev OP
832 posts
 
thks for the info., thats even more hours.

My understanding is that 2 of 6H30PI tubes are per channel and the one left over is partial for power supply is this correct?

If 2 per channel would it not be important to have a matched pair for each channel?

Are there any differences between the 6H30PI tube sonically? for example the date made much of a difference sonically?

Difference between the ARC tubes or purchasing from a reputable tube dealer?
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