View Larger Image Firestone, Spitfire MK 2 with V5i Opamp upgrade Easy to install and richer fuller sound. Thank you! By Sales Burson|2016-08-22T15:40:49+10:00August 22nd, 2016|V5i SS Opamp|Comments Off on Firestone, Spitfire MK 2 with V5i Opamp upgrade Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail