Hey-Hey!!!, I'd suggest the 2A3. While it won't teach you about super-silly HV, you'll learn much from the DH cathode. Go for a bit more load than 2k5, you'll still make your 2W.
Then again, I am currently palying with TX tubes, and I am just leaving the voltage spec of vintage AB1 commercial amps. Super high B+ is not a requirement.
If you get a custom SE output, say from Jack of Electra-Print, a 5k/80 mA 15W version would be useful for a lot of tubes. Up to an 845 at 7-800V. Very versatile, good for 300B, and even a high load 2A3. cheers, Douglas
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