NOS JAN Philips 7581A $120.00Price: $120.00 Matching * Matched Pair, $265.00 Matched Quartet, $530.00 Select Matched Pair for amps that use 2 of these tubes and Matched Quartet for amps that use 4 Taxonomy upgrade extras: 6L6/7581/5881/KT66/EL37/5932Tube MuseumBig bold 6L6GC great for super clean applications. Original boxes.