Inquiry: Aiken Amps Schematic for DIY Cabinet Switcher (1 Amp to 2 Cabs)?

[Andrew B. Campbell]

Does anyone happen to still have the Aiken Amps cabinet switcher schematic? The site that held those documents seems to have been down for awhile and the only material I can find points to their dummy load schematics or amp head switcher, but I would specifically like to have an A/B switch to select between two cabinets while using one amp head. I'm assuming I'd benefit from using relays, but I'd genuinely appreciate anyone helping out with this.