Back in the early 70s I purchased two Dyanco A-50s, a PAT-4 preamp, and a ST-120 amplifier. A year or so later I purchased another set of A-50s, a second PAT-4 and a second ST-120 thinking I would try the quad sound. Quad didn't do much for me so I ended up making it simple stereo system with one PAT-4 feeding the second with two speakers per side, one on top of the other. I have used this set up for over 35 years and never had a problem it with and liked the way it sounded. Recently one of the ST-120s died. While I was looking around for parts to fix it, I found all the mods that could be done to improve it. I also found a number of reviews that said the Dyanco ST-120 was a poor early transistor design and that just about anything today would be better. Now I am on the fence. Would the money put toward fixing the one and making the mods to both be better spent on two new amps? I was always happy with the ST-120s but perhaps ignorance is bliss and if I heard a newer amplifier I would be surprised at how much better it sounds over the ST-120. Does anyone have an opinion on what they might do in a similar situation? Do you have any recommendations on what would be good simple amplifier with no controls, only inputs and outputs, to replace both ST-120s without breaking the bank? As you may have guessed it has been a while since I have considered new gear and I don’t even know the good brands anymore.