My suppliers, in no particular order

For Valves (tubes):

• thetubestore.com in Canada. Fast delivery and they ship worldwide

For Output Transformers

• I use Hammond transformers, supplied by HiQ components NZ Ltd

For Mains transformers

• Mains transformers made to custom design by TWS Energy Controls NZ (Christchurch)
• Also Hammond transformers from HiQ

For Internal components

• jaycar for general components and connectors when I need something NOW from a bricks-and-mortar store
• rs online for general components
• element14 for general components, PCB supplies

For remote control volume, input selector assemblies, fasteners, connectors etc

• AliExpress to the rescue

For Chassis

• Aliexpress once again

For laser cutting / CNC chassis work

• Embrace Design (Wellington NZ)