| Manufacturer | Part Number | Description |
|---|---|---|
| International Power Sources | STK459 | (STK-4xx) Thick Film Hybrid ic |
| Unknown Manufacturer | STK-459 | Thick Film Hybrid IC |
SANYO (now Panasonic) |
STK459 | Power Amplifier 2 x |
| International Power Sources | STK-459 | (STK-4xx) Thick Film Hybrid ic |
