I didn't see a headphone jack listed for the Valveking. Do any Valveking owners have a method for using headphones with the Valveking using the line out?
They don't because it's not a practice amp?

Seriously, if you want a headphone otu you're going to need a practice level amp, I think the valveking Royal 8 is probably more the sort of thing you'd want for that.
R.I.P. My Signature. Lost to us in the great Signature Massacre of 2014.

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