John Dwyer

Seen here on Adult Swim's Fish Center Live is JPD hookin' it up with the classic Krautrock tape echo,the watkins copicat,just to the left of his amp head where his keyboards used to be

I'm guessing it's being used for guitar here because there's an orange cable going from the output of the tape echo to the input of the amp and Dwyer runs his keys through the PA,not his amp.

Plus,dig those runaway tape tones when he mutes a hard strum,real cool.

You can see the Space Echo on John's amp at 1:51 in this video.

"To capture the electric, anything-can-happen vibe the band projects when they perform, Thee Oh Sees recorded Warm Slime as if they were performing the songs live - tracking the whole thing on an old Tascam 388 eight-track tape machine in one short day of recording with zero overdubs." http://thebaybridged.com/2010/08/13/dissecting-the-song-thee-oh-sees-warm-slime/

you can see him playing it in this photo.