Blue Hawaii tube amp

When I got my Blue Hawaii, a good friend came over with several sets of vintage El 34's and 6CA7's.  I think one nice sounding pair was an xf3 tube, but, its been a while so I may be wrong.  I ended up liking a quad of Telefunken EL 34's, so that is what my friend gave me (I had a choice of any of the tubes he brought over).  The have, so far, been working out well for me.  I use them with Stax 007 mk1 headphones.

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. 

http://www.tubeaudiostore.com/elpremgrad.html - " The Siemens EL34 is one of the best EL34s made. These tubes are rare, new old stock tubes made with East German precision at the original East German factory, so basically Telefunken". These are black based tubes, not brown based like the ones on the bottom left in the link below. The rest of the tubes from Telefunken " EL34 tubes made by Telefunken in West Germany are pretty rare and Siemens and Lorenz never made any EL34 tube.

Take a look at the bottom of the page on the right hand side from the link below. Read the comments for the other tubes as well - http://www.tube-classics.de/TC/Tubes/SieTel%20EL34/EL34.htm

No way I’d pay $500 for a quad of those. I had 2 quads of the Siemens RFT tubes (East Germany) and never liked either of them. You could probably find mint NOS Mullard xf4 for the same price if you look hard enough.
Link to Philips/Mullard -  http://www.tube-classics.de/TC/Tubes/Valvo%20EL34/EL34.htm

For my particular taste, the 009 is a bit too bright and analytical sounding; the 007 is better in that regard.  But, the 009 goes substantially deeper in bass, is more efficient and can play louder than the 007, so there are trade-offs involved; I chose to stick with the 007.  I really like the Dan Clark Audio Voce electrostatic phone with the Blue Hawaii--it is a smooth sounding phone that is quite open sounding without too much brightness (Dan Clark Audio use to be called Mr. Speaker, so you might find discussion of this phone under that name).  

Larry and golfnutz, I really wish to thank you for the info. It is very helpful.