Moog
AVForums Veteran
I picked a quartet of NOS Philips 6550 valves from FDLS last week and have been making A to B comparisons with the GEC NOS 6550s that I have been using. In my amp the Philips have an edge in the midrange and more bass slam. I will now be keeping the GECs as spares! Thanks Mike it was nice doing business with you sir.