Those look to be a modified Fostex T50RP. I looked at the specs for the Fostex and they're 50 Ohms 98 dB SPL/mW and the Vali puts out 550 mW at 50 Ohms. So that'll put out just over 125 db SPL at full power. That should play plenty loud and deliver lots of headroom. I found that so many people were pleasantly surprised at how good they sound. These are not ultra sensitive IEMs, so tube noise should not be an issue.
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