National Horizon 20 HiFi Amplifier Manual $8.99 National Horizon 20 HiFi Amplifier Manual quantity Add to cart Category: National Description Description For sale is reprint of National Horizon 20 HiFi Amplifier Manual. Manual is 8 pages Includes Part List and Circuit Diagram. Manual also includes 2 Service Bulletins Hi-Fi-8 and Hi-Fi-9 Related products National HFS Radio Receiver Manual $8.99 Add to cart National NC-57M NC57M Radio Receiver Manual $10.49 Add to cart National NC-173 NC173 Radio Receiver Manual $10.49 Add to cart National NC-108 NC108 Receiver Manual $7.49 Add to cart