In this source he lists what he is using in the description of the video.
He played through this amp for American Pickers.
According to his "gear list", Robertson uses the Fender Vibroverb amplifier.
At 5:07, Buddy Guy's guitar tech says, "We got the Vibroverb here for a spare amp, or a guest amp, if someone wants sit in and play, we'll fire that up."
As can be seen at his official Instagram account (about making some music) you can see him using this item in the picture / video.
According to Guitar Geek's rig diagram, Sparhawk uses Fender Vintage Vibroverb.
i have customized with a single 15'' electrovoice speaker
how SRV of you
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