GEC
| Brand on Tube | GEC |
|---|---|
| Real Tube Manufacturer | M-O Valve Co. LTD |
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| Country | Great Britain |
| Etched code on Tube | RM 20 |
| Year | 1960 |
| Tip Shape | Pinched Tip |
| Glass Color | Clear Glass |
| Mica | Double Mica |
| Pin Color | Silver Pins |
| Base | Black |
