I have 3 headphones systems for my RAAL CA-1a (sold the SR1a last month and will buy the next RAAL phone release).
- tube headphone amp
- solid state Class A
- Schitt Mjolnir preamp (from 2023) | Schiit Aegir amp | RAAL TI-1b amp interface
- solid state Class D
- PeachTree GAN1 | RAAL TI-1b amp interface
With some tube rolling that was done by the manufacturer the V-1a is about 40% better than the other 2. I used to say about 15% better but I purchased the VM-1a for the second time and got a different tube (1 of 6). This tube made the separation with the other 2 systems greater.
What I hear is more power, more clarity and detail, more smoothness. I knew this was the case since I owned this amp before but now the VM-1a is even better. Until I had owned the VM-1a (now discontinued) I would have never thought a tube based amp would have ALL the attributes I just described.
This week, RAAL has come out with a new TOTL headphone that they are saying is the best sounding phone in the world. I thought the CA-1a and SR1a were something special. However, when I heard the comments from Alex at RAAL on this new phone (the best he has ever made), I immediately sold my SR1a and bought the VM-1a amp (again).
The new phone is called the Immanis and goes for about $10k. I may buy this one or wait for something else they come up with. All I know is that for these future phones I will get, I wanted the very best amplification for them and for me it is the tube based VM-1a.
BTW - I have not found a tube based setup (preamp or DAC) that made me as happy as my Class A and SS gear on my 2-channel. Now I have not tried a lot of tube gear with 2-channel. I have no interest in doing so since I love my 2-channel setups.