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Replacing 12AU7 tubes in a Prima Luna Dialogue integrated amp

Bought the until about 2-3 years ago, as the core of a new system (Dynaudio Excite 34X speakers, Rega 8 w/ Apheta 2 cartridge, Rega Aria phono amp, Oppo BDP-105D for CDs plus video).

Very happy with the system.

One of the 12AU7's crapped out, so buying a new set.  Tried pulling out the bad one, and its really, really tight in the socket.  Never swapped these out before, not sure if the just pull up, or have some cam lock to hold them in. Afraid to force it, possibly break something on the socket, it sure seems very very snug.

Sound normal?  Just keep pulling up until it moves, or ? 

Any tips, tricks or info appreciated.  (and yes, I am using the gloves PL provided for all handling of amp items.)

Richard
dalorzof
tooblue
1,882 posts
 
Rock the tube gently back and forth as you pull up .
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samzx12
1,216 posts
 
Yes what tooblue said. You won't hurt anything as they do fit snug. If you start rolling tubes you will become an expert. Just ask me lol. 
dalorzof OP
9 posts
 
Thanks for the confirmation, just hate forcing stuff when I am not sure.

Have seen reference to "rolling tubes"... no clue what that is/means... but will do some web searches.'

Thanks!
dalorzof OP
9 posts
 
OK, swapping the tubes from socket to socket to optimize sound.  Fun with 6 to mix-and-match...

All sorts of new things to look into and learn.
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samzx12
1,216 posts
 
Don't swap the same or stock tubes from socket to socket as it will not make any difference. Of course I doubt this is what you meant lol?  If you like the stock power tubes or the tone the EL34 present then you might want to roll in some driver tubes for example like some Cifte 12AU7 in the front 2 slots. These make the MOST difference and Kevin Deal will tell you the same thing. If you want a little more pop or dynamics to the sound then try a power  tube in the KT family such as a KT88/150.  Or even a Gold Lion KT77 which is closer to a EL34 but with more extension and drive. Its kind of like a hybrid tube.  However, enjoy the amp as it is and make sure it is broken in well and your ears to the stock sound and then make an evaluation. One step at a time trust me :)
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