|  
					
						| Early Philips E452T 
						with zinc coating |  | .jpg)  | .jpg)  | 
				 Tetrode Introduced in 
				1931 
					
						| 1 | 2 | 3 | 4 | 5 | tc | base |  
						| g2 | f | f | g1 | k,m | a | B5 |    
					
						| Vf | Af | Va | Vs | Vg | mAa | mAs | Ra | gm | Pdiss |  
						| 4 | 1 | 200 | 100 | -2 | 3 | 0.7 | 450,000 | 2 | 1 |    
					
						| Equivalent | 5-452T, AS4120, DN3004, DW7,
						RENS4342, RS4352, S412N, S4VB, T4500, 
						TE52, W409, W462 |  |