Try the audioasylum.com, many tube gurus hang out over there.
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Possible subs according to Rider.
E = excellent match
G = good match
Many tubes will be followed by G, GA, GB, GT, WGT and so on...Usually this is an indicator of the tube's ability to handle a little more voltage (only if your amp can supply it).
Also, this is a rectifier tube. Unless you need one that can handle extra voltage or abuse, don't change them. Your money will be much better spent on gain or power tubes.
For a great reference, go to www.sonicfrontiers.com and read several articles including "a taste of tubes".