LP70s bias question

[chapitalist]

Hi Guys,

First a big hello, and to say what a pleasure it is to have found so many CJ fans here at AA.

And secondly a question, would be very grateful for any suggestions. I recently shipped my LP70s back from asia to London and thought it would be a good opportunity to replace the tubes.

I took the plunge and ordered a quad of Tungsol KT120s. Problem is with the tubes in place I cannot get the bias right, doesn't matter how much I play with the setting the LED never lights. The sound is clearly wrong, compressed and scratchy. Do I need to do anything else to get these tubes working in the amp? Or more worrying could I have broken anything else inside?

Cheers,

Nick