NOS GE 6072 5 Star Blackplates Triple Mica
Super premium 12AY7 great in Tweed style guitar amps, audiophile equipment, microphones and micrphone preamps. May be plugged in sockets where 12AX7's are usually used. This has a lower gain and smoother sound than 12AX7's and is favored by blues players. Box colors and types vary.