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(!!!!) (#1 12AU7 Telefunken Cryo-Treated Pair 1963) 12AU7=ECC82 Telefunken Germany <> bottom Kuhl-Tube cryo-treated "Tektronix Checked" NOS 1963

$ 319.99

1 low noise cruo-treated pair) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS "Tektronix Checked" (B hl 25 = 1963) same date codes in white boxes

1 tube) 9.6/10.4ma Gm=2300/2400

1 tube) 10.6/10.8ma Gm=2500/2550

 

Good Ma = 8-10ma

Good Gm = 1800-2200

 

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