SS100 problem...

Hi Guys,
quick one - I'd say its just a tube but the clean channel on my SS is perfect but there is practically no volume on the lead channel when i switch over...
If i put the clean eq switch to the furthest position on the right it also gets quite distorted.

Hopefully only a preamp valve on the lead channel..... I have a few spares but to save me time rolling tubes does anyone know which tube I should look at first?
Kind regards all and Thanks Dave for making an awesome amp =)
 
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