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						Philips A409 with B4-base |  |  
					
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						Philips A409 with French Y-base |  | 
					
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						 Triode |  
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						| Vf | Af | Va | Vg | mAa | Ra | g | gm | Pdiss |  
						| 4 | 0.065 | 20-150 | -9 | 3.5 | 10,000 | 9 | 0.9 | 0.6 |  
							
								| Equivalent | 1-409, A408, AD4, AD510, 
								C9, 
								DZ908, G407, G409, H406, H615, IKA, L308, 
								L414, 
								M300, PM3X, R50, R75, 
								RE064, 
								RE074, RO4109, TM2, UX406 |  |  |