Thank you all for the suggestions.
Yesterday, I've had another idea: How about use yet another valve, using one triode as another gain stage and the other half as a cathode follower, which output impedance is about 600 Ohm for an 12AX7, thus being able to use a 1:1 transformer ( maybe this Z1604 - OEP (OXFORD ELECTRICAL PRODUCTS) - TRANSFORMER, 1:1, 600/600 | Farnell element14 Portugal
), which can be found easily and are more affordable. What do you think??
Yesterday, I've had another idea: How about use yet another valve, using one triode as another gain stage and the other half as a cathode follower, which output impedance is about 600 Ohm for an 12AX7, thus being able to use a 1:1 transformer ( maybe this Z1604 - OEP (OXFORD ELECTRICAL PRODUCTS) - TRANSFORMER, 1:1, 600/600 | Farnell element14 Portugal
), which can be found easily and are more affordable. What do you think??
A 12AX7 can't drive such a low impedance without high distortion, regardless of its source impedance as a cathode follower.
You'd also need a very large, high voltage electrolytic coupling capacitor.
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