Elrog 300B vs Takatsuki 300B tubes

I've about 34 hours on the Elrog on my Lampi. Sorry to say I'm quite disappointed with the sound. Initially, I had great hopes. When I first plugged them in, I heard buttery smooth sound with accurate timbre. However, it was not as transparent, dynamic, tight in the bass, or extended in the highs as the Psavane 101D or the TJ Full Music 300B SE. Even with break in, the overall sound has not changed. The music feels slow with the Elrogs, and they are the least revealing of the tubes I have. Seems like the harmonics are somehow truncated. Not sure how to explain this given all the positive reviews they've received here. I'm wondering if my tubes are either defective or needs more break in.

Dracule1,
Just goes to show that no product ever gets complete unanimous positive opinions/impressions. Variables and individual ears won't allow it to be. Sorry they didn't work out for you as they have for most of us posting here. I know I've raved about them, that being my honest experience with Elrog.
Charles,

If it can somehow be ascertained, it would be interesting to know what grid and plate voltages the Lampi operates the 300B at. I wouldn't be surprised if those voltages were considerably lower than in the Franks or other 300B power amps, and if that difference was a major contributor to the Elrog's performance in Dracule's DAC.

Best regards,
-- Al

Hi Al,
Good point, but interestingly Wyan001 and Germanboxers use the same DAC with superb results. Could system synergy partially explain it?

System synergy is a possibility. I use a Tortuga Audio passive LDR preamp. May there's an impedance mismatch? Tortuga has a new software upgrade so you can vary the impedance of the preamp, which I don't have. May its time to upgrade and see if this will improve the sound.

I don't doubt the Elrog owners who heard improvements with this tube.