|  | 
			
				| 
			
				|   | 
				  
				 
				Pentode 
				Introduced in 1933 
					
						| 1 | 2 | 3 | 4 | 5 | 6 |  
						| f | g2 | f | g1 | k | a |    
					
						| Vf | Af | Va | Vs | Vg | mAa | mAs | ra | gm |  
						| 4 | 1.1 | 200 | 100 | -2 | 5 | 1.25 | 1,000,000 | 3.5 |    
					
						| Equivalent | 5-447, AF2, 
						AS4100, E447, H4129D, 
						HP4105, HP4106, 
						KL70701S, MT4110, 
						MVSPen, 
						RENS1294, RS4347, T4700, 
						TE47, TF2, VMP4, 
						VP4, 
						W519, WE25 |  |  |  |