is there any reason why I shouldn't use an empty amp cabinet as an extension cabinet?

[stormsedge]

Do it...baffle if/as required.

 

[johnnylaw]

Sounds close enough for rock n’ roll.

 

[FenderLover]

use it for a hat

Wear the fox hat?

 

[archetype]

Go for it. Maybe block off the front chassis slot on a bf cab. Fender used to make them that way. They are rare, but they exist. Seen them in person in Del Rev size.

Right! Fender made ext cabs for the DR in and mid-60s. Here are examples. Oddly, they were serialized, each with a unique number. I saw one in the permanent collection of a music store owner back in the early 70s.

 

[W.L.Weller]

A pic of my erzatz Yamaha G-100 II stack. The combo lost its amp portion in a flood, and then eventually succumbed to the water damage itself. (don't get MDF wet, kids)

 

[5595bassman]

I did it. Front slot blocked with wood piece and aluminium sheet. Made a upper back panel with plank and installed a multi impedance jacks cup. Very clever when testing speakers or speakers mix.

 

[CWP0126]

Just came across this photo today in an eBay listing. It shows tweed, brown, and black extension cabs with a little information about them: