1 pair) 6BQ5 Sylvania gray plate NOS, 1 tube rebranded Philips

1 tube) 52.6ma Gm=11,450 red printing

1 tube) 54.6ma Gm=11,500 Philips by Sylvania

Matched on Amplitrex

Good mA range 40-48ma

Good Gm range 10-12,000

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