audio Research REF 110 and KT 120 tubes

I had some informations of Kalvin from ARC:

i have a REF 110 from 2008 (230V - 50Hz)
i would like to know if i can put KT 120 tubes instead of my 6550 tubes

Thanks

"Yes you can. They are a direct replacement.

Leonard Gustafson
Customer Service"

Thanks Kelvin

inside the new REF 110 it's the same as the old (like mine 2008)
the only difference is the tubes KT 120 ?

How the ref 110 does Sounds with the KT 120 ?

regards
Patrice

"Hello Patrice,

The KT 120 has more dynamics and better bass than the 6550. The amplifier also has more a little more headroom before it gets compressed.

Best Regards,

Kalvin Dahl
Customer Support"

Thanks Kalvin

inside the new REF 110 it's the same as the old (like mine 2008) ?
the only difference on the new REF110 is the tubes KT 120 inside ?

"Hello Patrice,

Yes. The only difference is the new KT120 tubes."

BTW I just retubed a VS60 with KT-120's. Awesome. In case someone was wondering if you can put KT-120's in a VS60. You can.

How about putting one of these KT 120 tubes in the Ref 3 power supply location? I would think that would make for an improvemnt in an already great preamp. They will be available sometime this year, correct?

Tlg...ARC is NOT using the KT-120 in any power supply in any of their products. 6550 only...I have KT-120's

As a follow up, the problem was, as I suspected, with the temporary pre. The KT-120s are not strident in the lower treble or upper mids. Rather it is an upgrade that can be heartily recommended all around.