TungSol Golden Aero's EL 34......

......Silver series.I have 4 of these I just found in my closet from a year or so ago so I looked here to try and find some for sale but couldn't.I canot remember anything about them and was wondering if anyone was familiar with them as far as quality goes.I am expecting an amp to arrive and in case I needed more what to expect like should I get the same or another quad of another brand.TIA,Bob