Rrog and sibelius offer good avdice. Cramolin, is great at first, then leaves black goo...not good. Clean and connect. Change tubes when noise is an issue. Jallen
Maintenance for Tube Preamps
I've enjoyed my Conrad Johnson tube preamp for a decade or so. Other than replacing the tubes a few times over the years there hasn't been anything else done to it. Are there other maintenance tasks that I should attend to? I believe all the capacitors are polypropylene (no pesky electrolytics!). All seems well, but I want to make sure I'm treating it properly.