Heath
| Brand on Tube | Heath |
|---|
| Real Tube Manufacturer | Mullard |
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|
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| Country | Great Britain |
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| Etched code on Tube | k61 R9E |
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| Year | 1959 |
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| Tip Shape | Pinched Tip |
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| Glass Color | Clear Glass |
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| Mica | Double |
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| Plate Color | Matte Gray |
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| Pin Color | Silver Pins |
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