*In accordance with the wishes of Audio Note, this product cannot be purchased by mail order, so will always show as 'out of stock' here, if you would like to purchase one please get in contact for more information* *Audio Note items are supplied to order, please allow approximately 8 weeks for build time* The M2 pre amplifier is available in two versions, the line level only version and the M2 Phono which adds an internal MM phono stage. The line level stage employs a 6SN7 valve and is fed from a valve rectified and regulated supply comprising a 6X5 and ECL82. The Phono stage equipped version includes an ECC83 and 6DJ8 for its MM phono stage.The output stage includes switchable feedback, with it 'On' the output impedance is lowered, enabling it to drive more difficult loads (i.e. power amplifiers whose input impedance is below 50K Ohms) and the overall gain drops (please see specifications below). INPUT IMPEDANCE 100K Ohms Line Level inputs, 47K Ohms MM Phono inputINPUT SENSITIVITY 126mV for 1V OutputGAIN @ 1KHz: 23dB Line Feedback off, 17dB Line Feedback on. 60dB Phono Feedback off, 54dB Phono Feedback onOUTPUT IMPEDANCE 5KOhm Feedback off, 2.5KOhm Feedback onOUTPUT NOISE (unweighted RMS) 0.4mV Line Feedback Off, 12mV Phono Feedback onVALVE COMPLEMENT1 x 6SN7WGTA1 x 6DJ8 (Phono)1 x ECC83 (Phono)1 x 6X51 x ECL82MAX. POWER CONSUMPTION 55 WattsUNIT WEIGHT 7 KGUNIT DIMENSIONS 140mm (h) x 295mm (w) x 450mm (d)