I use Save-On Sound on Antoine (not that far from you, I imagine.) 713-957-9600. The owner, Mr Tham (sp?) is very pleasant and helpful. He appreciates vintage gear, and I think his pricing is reasonable. I have an Infinity FET preamp getting "Phase II" repairs and upgrades there right now. Turnaround time may be a bit long for complex things, but the place is obviously busy - the shop full with vintage gear awaiting repair. Call first to make sure he's in (usually M-F 10-5.) There is an upfront charge of $30 which is applied to any final repair charges.