300B Tube Amps with 15/16 Watts Per Channel?

@wig appreciate the feedback. The Luxman iron was a custom order in your case ? I don't see it mentioned on their website.

@atmasphere thanks for the info. Wonderful explanation. Yes, my speakers Cube Audio Nenuphar is a single wide band driver. The manufacturer recommends amps with 0 or low feedback design, which will also have low damping factor. I have gone through some amps, and fine these recommendation matter a lot when it comes to the bass performance. 

The type of iron is dependent on what he have on hand but it will be very good with whatever iron he uses 😊

That's cool. Do you mind sharing what speakers are you pairing with it ?

A PP 300b amplifier can make about 35 Watts which will be far more satisfying your speakers. 

@atmasphere thank you for your guidance. As an amp manufacturer yourself, you have been very helpful with the education. Quiet contrary to many manufacturers who come here mostly to advertise their products.

@wig I am looking for 300b Zero NFB amps myself and the Otoman labs amp might be the ticket. Since most in US will be buying blind, could you describe a bit more of your experience with these amps ? What preamp are you pairing with it ?

@wig well, I have been meaning to try the Qualio IQ. Both Cube and Qualio comes from the same designer Grzegorz. They have a YT channel (Virtual Hifi) and the performance has been stellar. However, I was under the assumption the Qualio would need some amount of power to perform better. Have you spoken to the Qualio folks to see if low wattage 300b amps are a good match ? It would also depend on listening room and how loud you hear but I can't wait to hear your feedback on the Qualios with the Otomon amps.

@atmasphere thanks for all the info. That’s helpful and appreciate taking the time to educate some of us. I don’t think the Cube drivers are horn loaded but they do have a whizzer cone. In EU they are typically paired with Tektron 211 PSET amps at shows and the sound is sublime. I have seen them powered with 3/4 watts 2A3 SET in small rooms but I don’t think that will work in my situation as my room is a open configuration with lot of volume. Have gone through some amps, like FW SIT3, Pass X25, LTA UL and some other Class D but in all cases it seemed to lack dynamics until I paired it with a LM 805IA. This integrated is also heavy modified and it sounded very good but the only issue is this amp is easily prone to noise and ground loop issues. So in my experience, this speaker needs some bit of power depending on the room situation. I am now trying to see where can I go next. I know for sure getting a Tektron PSET would be an end game for this speakers, so I am trying to explore other options like Otomon which apparently seems very nice as well.

@donsachs I have no doubt that a 24w/ch PP 300b is more than what I would need. I know Clayton's original Spatial Audio very well as I had their open baffle at sometime. The amp looks beautiful and would love to own them, however, its priced out of my current budget (I have other diy projects lined up on the digital side). On another point, I am not sure how important balanced/unbalanced in my system. I have gone through a plethora of DACs in the past couple of yrs and some do sound slightly better in balanced configuration vs unbalanced. The reason why I bring up DACs is because if you have a unbalanced source, I am not sure how beneficial having balanced downstream is. Moreover, in my system their isn't much difference between the two anyway, it more of splitting hairs and I don't run long interconnects.