2 Channels with new gold pin ELMA Sensitivity switch used for gain control and the amplifiers are fully recapped. Features: 10-50dB Gain (in 5dB steps), Phantom (48V), Polarity Reverse (Phase), Output Fader. The D251s are similar to the Micpre is Neve 33114 input module or the Neve 3415 line amp (converted to pre). The D251 has a Class AB O/P stage. Great for vocals, Acoustic & Electric guitar and especially drums. These sound amazing! They have been used with care and well kept. ONLY US BIDDERS. Thank you for your visit to this auction.