Yes. I liked Siemens EL34’s and made in France Dario Miniwatt (green letters) ECC83’s most in mine. For preamp tubes I also really liked the made in Brazil Miniwatt 12AX7’s and made in Spain ECC83’s
For current made tubes imo what it came stock with is fine. Current made Tung-Sol’s might be a bit better by being a bit brighter, tighter and clearer