The expense for CJ to use NOS EL34 tubes would be prohibitive. Those tubes are rare and expensive now. I’ve been looking for a set myself for my Conrad Johnson Classic 120. I’ve given up due to the expense.
I’ve settled for upgrading the 6922 tubes in that amp and am delighted with the results. Btw - I don’t think the CJ provides NOS 6922 tubes. I’m pretty sure those are new Slovak tubes. The box was new and they look brand new. I switched them out.