Mullard 6HA5 EC900 Vacuum Tube NOS NIB Sextal It comes with a box

It comes with a box

This is an original recording from 1939 and it sounds 15-20 years ahead of its time

likely Tung-Sol-MANUFACTURED) measured 31 while Tube Two (no silkscreening 6AK5-LABELED

gas and transconductance

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