(!!!) (Recommended Pair) 6BQ5 Sylvania gray plate NOS (46.6ma and 47.6ma)1 pair) 6BQ5 Sylvania gray plate NOS, 1 tube rebranded Philips 1 tube) 47. 6ma Gm=11,100 red printing 1 tube) 46. 6ma Gm=10,850 Philips by Sylvania Matched on Amplitrex Good mA range 40 48ma Good Gm range 10 12,000 Recommended for BLACKHEART BH5H Bad Cat Black Cat 2003 Shindo Montille RM10 Gibson GA 5 Skylark 1966 VOX Kustom