I have to assume you have the BV60H instead of the combo BV60. There is only one channel path through the combo version.
How large is your test signal?
Apply the specified test signal to the amp and how do the test points compare? Note the specification also wants the controls set a certain way.
I wouldn;t be expecting symmetrical clipping here anyway.
I don;t see any mention of you trying a different tube in V2.