I have the chance to own a 2nd hand b22 for a decent price, but the owner doesn't know what gain it is.
How can I tell what gain the amp is set at? If it helps, the currently owner plays the HD600 at around 12 to 1 o'clock.
I would eventually want to set it to 5x gain, as I am thinking of having it run phones like HE500, AlphaDogs and such, but what can I do to change the gain? I have some soldering experience and is not adverse to DIY, but I am not...