ARC Ref 3: Tung-Sol 6550 in power supply?

Hi Guido what I read in my manual was aprox. 4000 hours so at 1700 you were not even half way.

I am curious now so any other ARC REF3 owners if you could jump in.

Guido, thanks for the info. and I fully agree regarding manuals and respect any persons own findings. Allot of ARC owners recommend just as Oneobgyn above has mentioned to stick with the Audio Research tubes but obviously you have chosen to go another route what are your findings.

So regarding the tubes when do you start replacing them and which ones and at what intervals, it seems to me that you refer to your power supply going the quickest.

Thanks, time to get some new tubes and hear the difference. What's the difference between the tubes that are being sold by Gon members in the ARC section which are half the price and buying directly from ARC and paying at least 100% more.