Good idea, I'll start with the STA540 replacement. Thanks!

What power supply are you using with it? The original supply? I believe I have the original judging from the photos on amazon here: https://www.amazon.com/Orange-Amplification-MT20-PSU-Terror-Supply/dp/B01D53KSK0#customerReviews I ordered a 2nd cheap charger off amazon that is 19v 2.37a. I had read...

I got this 1st gen MT20 from someone who gave up on it. Before I do as well, I thought I'd ask here. I know tube amps fairly well and have repaired and build a few. But I'm not familiar with these transistor types. I have tried this in various speaker configurations (4, 8, 16ohm). It works on low vo...