I've a couple photos of the other side as well as the original boxes.
I'll need to look closer for any etched codes.
I received the 5654 RT Radiotechnical Philips France Matched Pairs ! For me they literally disappear while the other tubes that I had, Mullard (5654 / cv4010), 6HM5 Sylvania, General Electric 6HM5, Amperex 6HQ5 ... I also Voshkod 6ZH1P-EV that I have not tested yet but these RTC tubes are more open, detailed, dense, beautiful voice, wide soundstage ... You'll understand I like them a lot, so much that I do not listen to the PANAM with Concero dac of Resonessence Labs ! I like the PANAM works wonderfully alone with my LCD-2 Fazor or my Oppo PM-2, I expect next week a Ultrasone Signature PRO ! I have in mind the tubes that will wonderfully with SIGPRO are the General Electric 6HM5, less spacious but a bit on the mid-bass !
Week 2 with the Pan Am and AKG Q701's -
CV4010 vs Mullard 5654
Switching back to the Mullard 5654 after some time with the CV4010.
Generally, the 5654 have richer mids. Not congested, but more present. More touch, and texture.
Vocals are closer, and more tactile. This character extends into the bass. Bass has more bloom here.
More colorful in comparison. Saturated. Stage is more intimate - smaller.
In contrast, while the CV4010 have similarly great mids - they are recessed in comparison. So, more air as the highs share the spotlight. They are more relaxed and natural in presentation. They don't sound dry to me, but are, set against the 5654.