Tube bias settings and slight hiss in one channel

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My Luxman LX-33 integrated amp uses 11 tubes, 4 x EL34, 2 x 12AU7, 1 x 6AQ8, 4 x 12AX7
I have put in new tubes which I like a lot but for the bias, ac, and dc voltage adjustments I have set them all on what appear to be default or middle position (?)
I do not have a manual for this amp as it is only available in Japanese.
It has a rather slight hiss in the right channel. It is not a big problem but it is not noticable in the left channel. I would like to know if this could be related to these adjustments.
Also is it safe to use the amp without fine-tuning these adjustments? How will this affect tube life and performance?
Thanks.

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Topic - Tube bias settings and slight hiss in one channel - oocela 09:35:08 04/21/07 (3)

Re: Tube bias settings and slight hiss in one channel - Ian L 20:03:14 04/23/07 (0)

You have not properly adjusted your amp - anumber1 11:55:13 04/21/07 (0)

Re: Tube bias settings and slight hiss in one channel - corerosin 11:37:45 04/21/07 (0)

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