Why are tube amps so expensive?

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Tags

1. #wiring
2. #point
3. #require
4. #amplifiers
5. #higher
6. #filament
7. #intense
8. #vacuum
9. #supplies
10. #expensive
11. #requiring
12. #state
13. #being
14. #voltages
15. #tubes
16. #outputs
17. #power
18. #compared
19. #audio
20. #hardware
21. #solid