Audio Research SP-14 Preamp 
This customer wanted a major overhaul and upgrade to his preamp. All capacitors were replaced with high equality Mundorf or V-Cap capacitors. Resistors are replaced with expensive Vishay Metal Film resistors. Total labor exceeds 40 hours, involving the complete disassembly of the entire chassis, and all PCBs. The of the parts alone cost over $ 800 dollars. Total Cost of Upgrade: $ 1300.00 (including $ 800 dollars in parts) Turnaround time: 4 weeks. 
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