My SP-11 is 33 years old so how much is that in pre-amp years? LOL.@daveaj255 The thing is, when electronics get that old, its prudent to have the power supply filter capacitors replaced to maintain reliability. They tend to fail slowly and its common for them to take the power transformer with them at some point, which would be a really expensive repair if you can even get the part! So it you plan to keep the preamp get the power supply serviced. Also make sure you instruct the technician doing the work to be careful to get values as close to original as possible- the regulators in the SP-10 and SP-11 were unstable to say the least- its not a good idea to do something that might set them off.
