Audiophile Tetrode
 RARE! GU-19-1 GU19 Audiophile Tetrode Tube TESTED US $9.00 
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6E6P-DRY/DRU Audiophile Tetrode Tubes. GOLD pins. 2pcs NOS, 6E5P Audiophile Tetrode Tubes Lot of 4 NOS, 6E6P-E Audiophile Tetrode, 6E6P-E Audiophile Tetrode Tubes Lot of 8 NEW, 6E6P-DRY/DRU Audiophile Tetrode Tubes. GOLD pins. 2pcs NOS, 6E6P-E Audiophile Tetrode Tubes Lot of 12 NOS, RUSSIAN TUBES 6E5P Audiophile Tetrode Tubes NEW in LOT of 10, GU-19-1 X 2pc. Russian Audiophile Tetrode Tube. NOS/NIB , RUSSIAN BEAM TETRODE 6P41S AUDIOPHILE TUBES 35pcs all-1987 NEW NOS , 6E6P-E Audiophile LONG LIFE Tetrode Tube NOS REFLEKTOR SAME DATECODE VIII-1976!, 6E6P-E Audiophile LONG LIFE Tetrode Tube NOS REFLEKTOR SAME DATECODE VIII-1976, 6E5P Audiophile HIGH RELIABLE Tetrode Tube NOS REFLEKTOR SAME DATECODE IV-1981, 6E5P Audiophile Tetrode Tubes Lot of 8 NOS, RARE! GU-19-1 GU19 Audiophile Tetrode Tube TESTED, 6E5P Russian Audiophile Tetrode tubes. 8 pcs. NOS,