I haven't been able to generalize on the 6N1P's. I think they come out of only 2 factories under different labels.
On the subject of tubes (not from a noise perspective, but rather from a sonic one), I'd look into replacing the JAN Philips 5687's.
The Philips are nice tubes and I understand why they selected them. I think a manufacturer has an ethical obligation to furnish a product in a configuration that an owner can easily replicate, and the Philips tubes are in plentiful supply. Kudos to Artemis for not putting their thumb on the scale.
I'd look into something like the Raytheon 5687's as a replacement.
Interestingly, the 12AX7 position is not all that touchy, and I'd look into this pair last. I've tried a few tubes in this position, and the stock, cryo-treated ones re-branded with the distributor's logo (Aydn), are right up there with the better ones.
Cheers,
Thom @ Galibier
On the subject of tubes (not from a noise perspective, but rather from a sonic one), I'd look into replacing the JAN Philips 5687's.
The Philips are nice tubes and I understand why they selected them. I think a manufacturer has an ethical obligation to furnish a product in a configuration that an owner can easily replicate, and the Philips tubes are in plentiful supply. Kudos to Artemis for not putting their thumb on the scale.
I'd look into something like the Raytheon 5687's as a replacement.
Interestingly, the 12AX7 position is not all that touchy, and I'd look into this pair last. I've tried a few tubes in this position, and the stock, cryo-treated ones re-branded with the distributor's logo (Aydn), are right up there with the better ones.
Cheers,
Thom @ Galibier