Matched modern power tubes are fine. 8 matched NOS power tubes would cost way too much, and besides, you won’t really find 8 matched tubes- there aren’t enough of them to sort and match them like they can new production. The recommendation for 8 premium matched Shuguang Treasure tubes is a viable answer to your question, but is almost absurd; too expensive to put so many in a budget amp.
The small signal tubes make the most difference and the cost is justifiable (to an audiophile, hah!)
If you must, Mesa can sell you a set of matched Siemens EL 34’s.
The small signal tubes make the most difference and the cost is justifiable (to an audiophile, hah!)
If you must, Mesa can sell you a set of matched Siemens EL 34’s.