How to pick a tubed integrated without hearing one

Take any of them, of those that Meiwan mentioned. I would get Rogue.

Develop a short list of potential amps, and then read everything you can about each of them. Look at the "professional" reviews as well as user comments on the various audio forums.

Hopefully you'll develop a sense of what attributes are important and have a better feeling about your purchase.

I use the Sophia Electric Baby that Br3098 mentioned. I run 92db towers in a room 17x30. Not a rock concert levels but loud enough that the conversation volume increases sometimes. Don't worry about the single set of inputs, I use a Kramer vs55se switcher for tuner, cd and phono preamp.

What speakers and other equipment do you presently have?

In the interim, I can easily go along with the recommendation of Rogue, however the Cronus Magnum is 90 wpcs and might be a bit much for your room size versus the base Cronus at 55wpc. Regardless of the amp you select, swapping out tubes- brands, NOS versus new issue, etc. will make a difference in what you hear - warmth, transparency, detail, etc. ,it is up to you what you like.

For EL34 tube integrateds research the Cayin A50T, the Jolida 302 and CJ CAV50. Used prices circa $900, $600 and $1100, respectively. The Cayin is well built, has auto bias and is point to point wired. The Jolida has circut boards but is decently built and servicable. The CJ is long out of production but is well regarded as a classic and still supported by CJ. But I warn you CAV50s come up for sale used infrequently. A used Rogue Cronus is worth checking out but may be a little North of your budget.

For EL34 power amps check out PrimaLuna PL1 and PL2 as well as the Tube Audio Design TAD60. All are excellent for the money. The PL2 will allow for both EL34s and Kt88s, while the PL1 only uses EL34s. Both are auto bias. The TAD is not autobias but is simple to bias. It also can function as a single source integrated. It is out of production but still supported by the internet seller. Used prices for these are generally around $1000, give or take.

All of these mentioned, except the CJ and Rogue, are sourced from China but come through US distribution and are built to quality standards. Given your price point these offer the best value IMHO.