I removed the limiter and listened for 1 hour. The amp has a great sound. I'm pleased.
Next steps are get the Power transformer back in and correctly fused and earthed. The original 'mouse trap' fuse will be added back just for looks. I'm using a 500mA quick blow right now.
I'll also add some of my scanned diagrams, photos, (maybe a parts list) and notes once I'm completely sure everything is good - for future SPA11 restorers.