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

1 tube) 48.0ma Gm=10,300 Sylvania branded Philco 1960's

1 tube) 49.5ma Gm=10,700 Philips by Sylvania 1970's

Matched on Amplitrex

Good mA range 40-48ma

Good Gm range 10-12,000

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