| Country | Canada |
|---|---|
| Manufacturer | Addison Industries, Ltd.;Toronto |
| Model | 21 - Addison Industries, Ltd.; |
| Year: 1947 | Broadcast Receiver |
| Valves | 5: 12SA7 12SK7 12SQ7 50L6GT 35Z5GT |
| Technology | IF 456 kHz |
| Wave Bands | Broadcast only (MW). |
| Power Type | AC/DC-set / DC or AC 25-60 cycles 110 - 120 Volt |
| Dimensions | 360 x 227 x 180 mm / 14.2 x 8.9 x 7.1 inch |
| Source | MyFile: Addison-21_36-1947.Radio.pdf |
| Source | MyFile: Addison-21.Radio.jpg |
| Type | Configuration | Year | Base | Equivalents |
|---|---|---|---|---|
| 12SA7 | Heptode | 1939 | IO | CV537 |
| 12SK7 | Pentode | 1939 | IO | CV543 VT131 |
| 12SQ7 | Double Diode Triode | 1939 | IO | CV546 VT104 |
| 50L6GT | Beam Tetrode | 1941 | IO | CV571 KT71 |
| 35Z5GT | HW Rectifier | 1939 | IO | CV568 |