Almost all Class II beers are 'pils', and are really not the best pils available. Therefore I listed below only the places I know that serve other types of beer. Fantastic bar, where the beautiful girls of Bergen dance around you when you enjoy the best of Norwegian beer. Oslo Mikro Bryggeriet Bogstadveien 6. Usually 4-5 different kinds on tap, including various ales and dark beers.
Available beers change regularly.
Palace Grill Soligate 2. Concerts now and then. Sjakk Matt Haakon VII gate 5. Also serve beers from Oslo Bryggeri Kompaniet, changes from time to time, sometimes a white beer sometimes an 'steamer'. Amsterdam Ground floor of the 'Savoy' hotel, on Universitetsgate.