Jolida JD-100 can U use 12AU7 or 12AT7 instead?

Just wondering if anyone knows if either of these tubes can be used instead of the 12AX7 in this circuit.

Showing 2 responses by stevecham

Ditto Amandarae, you must use the 12AX7, ECC83 or 5751 as only they have the required amount of gain for this circuit.
By the way try a pair of matched Ei (not EH) 12AX7s in this player, they make my JD-100 sound fabulous and I have tried all except Mullards.