The R5559 is a low noise triode designed for wideband amplification. The mutual conductance is 25 mA/V and like many low noise valves the anode current is substantial.
The gold plated base pins - clearly a professional valve.Thanks to Mark Mallison for sending the images.The thin glass tube envelope is mm in diameter and, excluding the B9A base pins, is mm tall.Reference: Data. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  a | ic | h | k,s | ic | k,s | g1 | k,s | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm |
| 6.3 | 0.3 | 150 | -1 | 25.0 | 1,600 | 25 |
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Updated January 19, 2024.
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