Tube Preamp: 12AT7 Siemens (= ECC81).Gain factor 60. NOS=New Old Stock from 1970s.

Great quality!! 12AX7 - ECC83, 7025, ECC803, E83CC, 6681 : GAIN 100, 5751: GAIN 70, 12AT7 - ECC81, 6201, 6679 : GAIN 60, 12AY7 - 6072 : GAIN 45 12AV7 - 5965 : GAIN 41 12AU7 - ECC82, 5963, 5814, 6189 : GAIN 19 Preamp Tube Gain Factor Choosing pre-amp tubes by gain factor One simple tweak that is favored by guitar amp users is to plug in a pre-amp tube with a slightly different gain factor. . 390 SEK