Thank you for the comments. I have did some research before I asked. The Siemans EL34's were reviewed well so am leaning toward them. I just bought the amp and I don't even have any headphones for it yet to try. I currently am using the Abyss 1266 phi CC with the Audio-gd master 9 and wanted to upgrade so I thought I would try the BHSE and am deciding what headphones to try first. I read that someone said the Stax 009's gave them a headache after 20-30 minutes.
Blue Hawaii tube amp
What brand would you replace the tubes with and where to get them? Thanks