(!!!!) (Best Pair) 6BQ7A RCA black plates NOS 1967 same date codes (15/14.5ma and 13.5/16.5ma)

1 low noise pair) 6BQ7A RCA black plates NOS 1967 same date codes (BM)

1 tube) 15.0/14.5ma Gm=8900/8400

1 tube) 13.5/16.5ma Gm=8400/9200

Matched on Amplitrex

Good Ma = 8-9ma

Good Gm = 6000-6400

(also see 6BZ7 and 6BK7B)

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