6BK7B Philco by Sylvania NOS 1960 (13.2ma/15.2ma)

1 low noise tube) 6BK7B Philco by Sylvania NOS 1960 in white box

1 section) 13.2ma Gm=8500

1 section) 15.2ma Gm=8800

Tested on Amplitrex

– Modwright Transporter
– Schiit Lyr amp 2011
– Don Allen
– Donald North Audio (DNA) Stratus