Frequency response: 5Hz to 30kHzTotal harmonic distortion: 0.01%Gain: 60dB (MM), 26dB (line)Signal to noise ratio: 66dB (MM), 90dB (line)Output: 2V (Pre out), 60V (Pre out Max)Valve complement: 6 x ECC83Dimensions: 480 x 134 x 260mmWeight: 10kgCondition:This unit is a recent estate sale find! It is a nice clean well cared for unit. Its missing one bottom screw.Tested:I checked all tubes on a tester and they tested strong. I also treated all switches, pots and valve inserts with DeoXit cleaner lubricant. The unit powers on and goes into a standby mode for a couple of minutes, a green light flashes, then the light stops flashing, it stays lit and beautiful sound flowed through my speakers as provided in the video. The unit due to age, will most likely require restorative services.

This Audio Research SP-6B Preamplifier has been tested and is in working condition. This came to me in an estate. I don’t know any history of this preamp. The condition is used/good. Please see pictures. I only ship ground to the 48 States. Signature required delivery. I do not guarantee any vintage electronic equipment. This could last for years to come or could need immediate servicing in the near future. When purchasing 30-40 year old electronics this is the inherent risk we all take. ALL SALES ARE FINAL, NO RETURNS.

This Audio Research SP-6B Preamplifier has been tested and is in working condition. This came to me in an estate. I don’t know any history of this preamp. The condition is used/good. Please see pictures. I only ship ground to the 48 States. Signature required delivery. I do not guarantee any vintage electronic equipment. This could last for years to come or could need immediate servicing in the near future. When purchasing 30-40 year old electronics this is the inherent risk we all take. ALL SALES ARE FINAL, NO RETURNS.