I still have GTA SE40 monoblocks that I bought used almost 20 years ago. Very light use the last 10 years, but they still work. I plan to do the SonicCraft updates at some point. I should really sell them as I have other amplifiers that I use more often, but it's hard to let them go.
what happened to Golden Tube?
Whatever happened to Golden Tube amps? When did they go away?
Back in the day, I remember Accutronics of Ann Arbor having a whole row of them on display, as an economical alternative to Cary (Dennis Had days).