You should have your tubes tested before replacing. 1.5 years is not that old. You should get 1000+hours out of them.
As far as matching goes, getting matched pairs or quads of tubes will always cost more but not twice as much. Try:
thetubestore.com
upscaleaudio.com
echohifi.com
tubeworld.com pricey
tubeman.com can be pricey
tubesandmore.com inexpensive but still good
As far as matching goes, getting matched pairs or quads of tubes will always cost more but not twice as much. Try:
thetubestore.com
upscaleaudio.com
echohifi.com
tubeworld.com pricey
tubeman.com can be pricey
tubesandmore.com inexpensive but still good