It all depends on whether the product is designed to have a long service life or is meant to be a cheap throwaway. People demand cheaper, and that's what they get. Quality remains quality for those who still wish to pay for it. Those sixty year-old tube amps were priced WAY above the cheap stuff we currently have available, and comparing the two is kinda goofy. There are plenty of old tube amps that didn't hold up to the test of time, and nobody talks about them because they wound up in the landfills decades ago.