| 
				 |   
				 Output pentode Introduced in 1935, B5: 1937 
				
					
						| 1 | 2 | 3 | 4 | 5/sc | base |  
						| a | g1 | f | f,g3 | g2 | B5/B4 + sc |    
					
						
							|  | Vf | Af | Va | Vs | Vg | mAa | mAs | Pout |  
							| B4+sc | 2 | 0.2 | 150 | 150 | -4.5 | 9.5 | 2.5 | 0.42 |  
							| B5 | 2 | 0.15 | 135 | 135 | -4.5 | 5.6 | 1.35 | 0.34 |  
 
					
						| Equivalent | 220OT, 220PEN, CV3646,
						KT2, NR39, PEN220, 
						PENB1, PT2, VR118 |    |