I have both! A Will Vincent custom- built 45 SET using Emcron output trannies; a 2A3 Sanei 560A with Tango power, choke and trannies from Japan. Neither in use because I sold my vintage Heresy's - the only speakers on hand capable of use with low power SET's. The 45 is only good for 1.75 watts at clipping; the 2A3 will do 3.5 watts. Subjective impressions of these two tubes is entirely dependent upon speaker choices. In fact the 45, 2A3 and 300B are most linear when used at 25% power. Past that distortion rises rapidly!
2a3 ?
I see that the 300b tube gets a lot of love here, do we have any 2a3 fans? I owned a pair of George Wright monos several years ago and I’m leaning that direction again. I’m also giving thought to the Coincident 300b stereo which certainly seems good value although the price of admission for quality tubes is steep. Any of my speakers are efficient enough for either option.