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				Detector or AF triode 
				Introduced in 
				1929 
				
				
					
						| 1 | 
						2 | 
						3 | 
						4 | 
						5 | 
						
						base | 
					 
					
						| a | 
						g | 
						f | 
						f | 
						k,m | 
						B5 | 
					 
				 
				 
				  
				
				
					
						|   | 
						
						Vf | 
						
						Af | 
						
						Va | 
						
						Vg | 
						
						mAa | 
						
						Ra | 
						gm | 
						Pdiss | 
					 
					
						| 354V | 
						
						4 | 
						
						1 | 
						180 | 
						
						-3  | 
						4.5 | 
						
						14,000 | 
						2.5 | 
						  | 
					 
					
						| improved | 
						  | 
						1 | 
						200 | 
						
						-4 | 
						4 | 
						12,000 | 
						3 | 
						  | 
					 
					
						| further 
						improved | 
						  | 
						0.65 | 
						250 | 
						
						-4.5 | 
						6.5 | 
						11,500 | 
						3.5 | 
						  | 
					 
				 
				
					
						| Equivalent | 
						4GPAC, 5-428, 41MHF,  
						70504, A30D, A4110,
						AC/HL, D4, HLA2,
						MH4, REN904, 
						TE24, TL425 | 
					 
				 
				 
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