[dminches]

I have an AE PH-1 phono pre-amp.  It takes 2 6SL7s and 1 12AU7.  I am finding the sound a bit rolled off at the high end.  The 6SL7s I believe are Jan-Phililps tubes.  I don't know that the 12AU7 is.  Any suggestions that would balance the sound a bit?  I don't want the high end to be colored but I feel like I need to change something to make it neutral.

[Jon L]

I have an AE PH-1 phono pre-amp.  It takes 2 6SL7s and 1 12AU7.  I am finding the sound a bit rolled off at the high end.  The 6SL7s I believe are Jan-Phililps tubes.  I don't know that the 12AU7 is.  Any suggestions that would balance the sound a bit?  I don't want the high end to be colored but I feel like I need to change something to make it neutral.

For airy/extended 12AU7 types:

Cheap and good:  RCA 5814A, CBS (aka Raytheon) 5814A

Good (but not cheap):  Siemens 5814A or 12AU7's

Wild card that's not particularly as extended or refined but one I often end up using anyway for sheer tone, liveliness:  Ei 12AU7

[dminches]

Are the Siemens ECC82 the same tube?

[bunnyma357]

My favorite is the RFT ECC82, I've compared them with various GE, RCA and other 5814's. But not against anything really expensive.

http://www.boiaudioworks.com/12AU7_ECC82RFTNOS

Jim C

[Tyson]

Go for the Siemens, they are almost always a great all-around sounding tube.  ECC82 is the same as a 12au7.

[dminches]

I just started to burn in a pair of BRIMAR UK 6SL7GT's black round plates that I purchased from Tube World.  So far so good.