|
220PTSensibly equivalent¶ to:See also:
|
|
|
The 220PT is a battery output pentode from the 1930s. With the correct anode load of 7500 Ohms this valve can deliver one Watt at 8% distortion.The screen grid is taken to the side terminal.The original B4 based 220PT was issued in 1932 with the B5 based version released a year later.The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 95 mm tall.References: Data-sheet & 1043. Type 220PT was first introduced in 1932. See also 1932 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 |  a | g1 | f | f |
|
|
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 2.0 | 0.2 | 150 | 150 | -9 | 19.0 | 4.0 | - | 2.5 |
|
Updated September 08, 2021.
|
|
