|  | 
			
				| 
			
				|   | 
				 
				Detector or AF triode 
					
						| Introduced in 1926 (improved: 
						1927) |    
				
					
						|  | Vf | Af | Va | Vg | mAa | ra | gm |  
						|  | 4 | 0,1 | 100 |  |  | 16,000 | 0.84 |  
						| Improved | 4 | 0,075 | 100 | 0 | 2 | 13,000 | 1.05 |  
					
						| Equivalent | 1-415, A415, CV1154, D15, 
						DZ1508, G415, 
						HX406, L308, L410,
						LD410, M144, PM4DX, R76,
						RE084, 
						RO4215, RO4324,
						RRAF, TA10 |  |  |  |