John Dwyer

He uses a blackface and a silverface Music Man tilted horizontally and stacked on top of each other

at 1:48 in this video, John can be seen adjusting his space echo sitting on top of two blackface twin reverb amps.

John Dwyer is known to use a Fender Silverface-era Dual Showman Reverb head, as detailed in PMT Online's gear guide for Thee Oh Sees' new album by Richard Bloomer.

In the YouTube video "Oh Sees - Live at La Route du Rock 2017" by Rafiot, John Dwyer is seen using the Fender Hot Rod DeVille 212 III 60W 2x12 Tube Guitar Combo Amp at the 1:30 mark.

John Dwyer is seen using a 1970s Fender Bassman 2x15 Cabinet in a photo from Theeohsees. The placement of the Fender logo and the cabinet's size suggest this model. He has been using one or two of these cabinets, depending on the gig size, from 2015 to 2017.

mic'd up in the corner of Dwyer's home studio

In a photo by Jorge Thompson on Pinterest, John Dwyer is seen using a Gallien-Krueger 2001RB Amplifier Head. The image, likely from 2017 or earlier, features a distinctive number of knobs that match this amplifier model.

John Dwyer is seen using Fender 212 cabinets, identifiable by their size and logo placement, in performances from 2015 to 2017. Depending on the gig size, he uses one or two cabinets, as shown in the photo from Theeohsees.

In the Imgur photo captioned "Stu Stu Studio," John Dwyer is seen with the SG Systems SG-215 amplifier in his studio. This amplifier was also spotted at a flea market booth where Dwyer was demoing pedals.

in this youtube video john dwyer its using a orange crush bass 100 at 33:30