the 1626 is a small single triode. Its plate Z is ~2k5 at a reasonable O-P. It could be made to work as an amp's final, but there are better IMO. Type 45 among them( and I'm not much of a 45 fan ). this is another option for using the Guinevere power Iron, PP 45's. Same 10k PP OPTx, but a bit lighter a current load than a pair of 2A3's. 45's are a bit on the expensive side, especially for new production.
If a small triode PP amp is what you'd like, let's see if we can find a cool, nearly unknown one for it. 3 or 4 sections of 5687 per phase are one neat sol'n...
regards,
Douglas