pretty much any of the old style tube amps w cages, even the well executed e.g. Music Reference RM-9, Mac 240….
For those needing to retain the cover, i can highly recommend two different products: HRS damper blocks, VPI Magic Brick. There are others including DIY
For those needing to retain the cover, i can highly recommend two different products: HRS damper blocks, VPI Magic Brick. There are others including DIY