Any (new) Tube Testers that can be recommended?

Yep I looked into them and was definitely priced out since my use would be minimal.  I’m not a seller.  Bought a used Hickok 600a museum piece (older than me) that was in excellent condition (calibrated in 2022) for $200. It will not properly match tubes but it is very good at testing if a tube is good/bad, the strength (% to avg new) of tubes , tests both sides of triode tube to check balance and more.  These results are very helpful in getting tubes paired with close results.  My unit gets the same results if retested  and seems pretty accurate.  I love it and am able to test new nos purchases and have helped me determine bad/ poor tubes that can’t be used and returned. Most tubes I have bought my results are close to the sellers results.  These older testers do have their benefits and usefulness.

You get what you pay for.  I have an old Hickok and a military TV-7D/U. The manual for the TV-7 has instructions on how to destroy the unit with hand grenades or hand tools.  Wouldn't want one of those falling into the hands of the enemy.

The first response to your post was mine, recommending the Ampltrex AT1000 tube tester. Not sure why it was deleted.

@tomcy6  💥 🤣 ….agree Ampltrex is the best and you get what you pay for.  If money is not a concern it’s a great choice.  I just couldn’t justify the expense for amount of use it would get.

And the Amplitrex can test output tubes at realistic voltages (example 6550a tube at 250V, 450V or 500V vs 170V w/Hickok 539b, plus the Amplitrex can test 6H30 and KT-150 tubes.

Also, Amplitrex can test at a "fixed" bias or "auto" bias...Matching power tubes and matching both halves of a triode too.

When used with a Windows computer via USB, the Amplitrex can provide a detailed report (file), in either pdf or png format. Post-able or Printable if desired.

Repeatable results.