Best tubes for ARC LS16 preamp

I have an LS-16 with the original factory tubes. Where would you suggest to buy new tubes?

Joeavid...please let us know what differences you notice when you get the new tubes going.

Does anyone have feedback on the AR upgrade ($1095) for the LS-16?

Thanks

I´m also curious to know how the original LS16 stack up to the MKII status.

Thanks,

Just got siemens 6922 e88cc today,gold pins west germany(1960's)...from tube world,a bit pricey @$105 each.Asked my dealer re:upgrade to mk11 status but he hasn't heard it yet,so i'll keep you guys updated...

Thanks for the info Albert. I have a pair of Siemens 6922 E88CC and 6922 CCas at home as well as a pair of Mullards on the way. I can't wait to try them out in my DAC.

Had to return the siemens too noisy and got a hum in my left speaker after a week.Went to vintage tube services,highly recommend you pay a visit or call Andy,the man knows his tubes.bought 4 matsushita tubes,already after r 6 hrs sound better than the siemens.