I have been repairing and upgrading my home HiFi system and was organizing some stuff in a drawer and found some extra vacuum tubes that I no longer need.  I will be listing more like a pair of the "grail" RCA triple mica black plate 5751/12ax7, and a RCA NOS 12au7 "clear top" side getter.  So check back...

This listing is for two (not matched since I have no way of testing them) used 5V4 tubes.  I have a Cayin A 300B integrated amp that uses the 5V4 as the rectifier but I have a pair of extras already, so I don't need these.  They would have worked back in 2011 when I bought them, but I have not used them since.  Probably purchased from Tube Monger back then.  These are commonly used in guitar and bass amps too.