user: Question: What are the dimensions of the amp with a 180W output?
Columns: ['Model', 'Poweramp', 'Dimensions', 'Mass', 'Form factor(s)', 'Output']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['VH4', 'Mono , 4\u2009tubes\u2009', '29\u2009×\u200911\u2009×\u200911\u2009in 74\u2009×\u200928\u2009×\u200928\u2009cm', '50\u2009lb (23\u2009kg)', 'Head', '90 — 160W']
SQL:

assistant: SELECT "Dimensions" FROM "Table" WHERE "Output" = '180W';