May I suggest that you look at 5751 tubes. Slightly lower gain but much cleaner.
They are a direct replacement.
Google "Joe's Tube Lore" for a nice review of many different brands.
While your and my results will vary from those of Joe's, it is a good general starting point.
You could buy several pairs and try them to find what best fits your system and then sell those that don't float your boat.
A very good one with a bold presentation and rather sweet treble is a Raytheon 5751 with the windmill getter.
Good luck and Have Fun with it.
They are a direct replacement.
Google "Joe's Tube Lore" for a nice review of many different brands.
While your and my results will vary from those of Joe's, it is a good general starting point.
You could buy several pairs and try them to find what best fits your system and then sell those that don't float your boat.
A very good one with a bold presentation and rather sweet treble is a Raytheon 5751 with the windmill getter.
Good luck and Have Fun with it.