No one said you can't do it. There's just no reason to do it. Tube amps are basically a standard and it's what the amp repair guys know how to work on and it's easiest to work on.
There are real reasons to do that, even if you like tube amps:
- Tube amps need regular tube swaps. For a small guitar Combo a set of tubes (3× preamp + 2× power amp) can cost between 100 to 150 Euros. If you're a poor musician that is a factor
- Tube amps use heavy power and output transformers. If you ever had to carry an Ampeg SVT (36 kg for 300W) you will cherish the idea of a 0.25 kg 500W class D amp. If you're a touring musician that is a factor
- Tube amps are limited in terms of sound. While this could be seen both as a feature and a bug, if you want to recall the perfect settings for each song as a touring musician, tube amps are not the right choice unless you have a horde of roadies and technicians
This is why amp sims have become more popular in the recent years with people who play music for a living.
That being said, if you're in a simple band and you want the sound of a tube amp, a tube amp gives it to you pretty reliably without making you drown in options or giving you the feeling your gear is outdated every other year, since it is outdated since decades anyways. A tube amp also needs no firmware updates and requires no subscription and has less parts that can break.
- Tube amps need regular tube swaps. For a small guitar Combo a set of tubes (3× preamp + 2× power amp) can cost between 100 to 150 Euros. If you're a poor musician that is a factor
- Tube amps use heavy power and output transformers. If you ever had to carry an Ampeg SVT (36 kg for 300W) you will cherish the idea of a 0.25 kg 500W class D amp. If you're a touring musician that is a factor
- Tube amps are limited in terms of sound. While this could be seen both as a feature and a bug, if you want to recall the perfect settings for each song as a touring musician, tube amps are not the right choice unless you have a horde of roadies and technicians
This is why amp sims have become more popular in the recent years with people who play music for a living.
That being said, if you're in a simple band and you want the sound of a tube amp, a tube amp gives it to you pretty reliably without making you drown in options or giving you the feeling your gear is outdated every other year, since it is outdated since decades anyways. A tube amp also needs no firmware updates and requires no subscription and has less parts that can break.