Local Score David Bogen Model DB20DF MONO

I picked this Bogen mono integrated for $60.

 I haven't cleaned it yet but here it is all crusty.

 It has an interesting damping factor knob.

 There is one Amperex 12AT7 but it is abit harry.

 

Appears to be 6L6 push pull and the tubes are black plate.

 

Has a nifty ruble filter and advice. I've only seen one person hot swap tubes that was Dave Slagle. 

 Some of the caps are nice and bubbly.

 Any advice or feedback on this amp appreciated. I actually have need of a stable mono amp.