Valvo
| Brand on Tube | Valvo |
|---|
| Real Tube Manufacturer | Philips |
|---|
|
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| Country | Holland |
|---|
| Etched code on Tube | 8f6 ⊿4G4 |
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| Factory Code | ⊿ - Philips, Heerlen |
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| Year | 1964 |
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| Tip Shape | Pinched Tip |
|---|
| Glass Color | Clear Glass |
|---|
| Getter | D-Getter |
|---|
| Plate Look | Mesh |
|---|
| Plate Color | Shiny Gray |
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