It is a very high entry point for your tube headamp listen. I have a very rare, modded (done by Craig himself) BA to allow the use of PX25 tubes. It is quite a bit more powerful with PX25 than other power tubes like PX4 or 300B. I hope it is suitable for Phi.

Does the BA have enough power to drive the Phi? My impression is that one needs a lot more power to drive the Phi properly.

My BA is modified by Craig himself to accommodate both PX25 and PX4.  Craig also made a pair of B4 to UX4 adapters for me at the same time.  I trust Rosgr's words, who is a real expert on tubes in general.  The modification of my BA could be just to accommodate the use of PX25 tubes.  Osram...

Modification of BA is required to accommodate AVVT PX-4M.  A pair of adapters are also required.  Check with Craig if your BA could use these tubes.  Be aware of possible reliability issues with these tubes.  They sound very nice (especially with a Mullard ECC35 as the driver).  My pair became...

Quote: Good luck and best wishes.

Quote: Just as Grokit described, mine is also dead silent.  No problem at all. 

What are the tubes?  Is there going to be a SE version?

Except when there is one used by a private owner for no more than 100 hour total.  Mine was bought around chirstmas time, packed in the original box ready for shipping.  I highly recommend the RA150, especially with a tube preamp in the front.  I bought it for $180-200.  If anybody is interested...

My WA22 is sold so my next statement has nothing to do with my own interest (in fact what I encourage will hurt my own interested).  I think you shold go with WA22.  You will have the flexibility to use it for different phones.  People has reported great results pairing LCD3 and WA22.  Of...

I do not think there is any disagreement between our experience.  I also feel a little bit uneasy about leaving it that way forever.   I think that is just because I do not know the electronic side of things well enough to feel safe. 

An ECBA still in California being modded by Craig.  After the mod, the amp can take PX25, PX4, 300B.  A weapon of money destruction.  Quote:

What a pleasant suprise!  We have never met even on this site, but I want to thank you for your tube rolling thread with WA22 driving HD650.  I read it from begining to the end many times.  I own WA22, HD650 and many 6F8Gs because of your thread.  I always recommend people to read that when they...

Quote: I have a one-year old WA22 (shipped on April 12, 2011) in excellent condition with a preamp XLR out installed by Jack when I ordered the amp.  The amp is available for sale if you are interested.  Please e-mail me if you want more information.  I also have the original box.  Other...

I am listening now with Amperex, Mullard, EH and Sylvania EL84.  Nothing is wrong, channel balance, tonality, image, detail etc.  Once again, a different sound but enjoyable.   By the way, I never said "not bad", I said "a different sound but enjoyable to my ears.  Nothing wrong so far."  ...

Take it easy.  We are talking about headphone and headphone amp for fun.    I had CBS 7729/amperex EL84 d-getters in my Leben.  I just replaced the amperex EL 84 in position four (1,2,3,4 from left to right) with a sylvania 6BQ5 and the amperex in position two with a mullard EL84, so the...