Oscillation is a nasty beast, as it can be inaudible and fry downstream components.
Installed bulk foil resistors in phono amp
I installed four of these Vishay Z-Foil (TX2575) in my phono preamp - the loading and series input resistors on the first triode. Considerable improvement in clarity, image stability and perception of speed. Highly recommended upgrade. PartsConnexion. 4 for $65.