Yup, last week used a pair to fix a 1966 mystery amp - 1x12 combo with the amp obviously made in Japan, in a cab with a Jensen C12P. The EH's worked just fine - although by the time I got the bias current dialed down to the point plate power was only 10% over design max 12W, the output waveform looked awful. Sounded OK though. Had I left the original 300 ohm cathode resistor in there, plate power would have been a bit over 16 watts. One thing I didn't get to try, possibly the amp would have been happier with a 16 ohm speaker. B+ was about 415V, and it had a 5K resistor going to the screen grid node kind of like a tweed Deluxe. Output power about 12W into 8 ohms.
Can't give any kind of long term review. If the crustomer plays it a lot, we'll find out in ensuing months & years. Maybe.