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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
dalorzof OP
9 posts
 
Was thinking they may bring a bit more depth to the mix, maybe a minor enhancement/separation to the midrange.  Not that the KT88's sound "bad", Just figure after 2 years maybe try something new.
dalorzof OP
9 posts
 
And unfortunately Upscale Audio won't deal with International customers, I live in Australia....
mr_m
1,900 posts
 
Try Andy Bauman of Vintage Tube Services. There is nobody on the planet that knows tubes better than him. He tests and auditions every type of tube imaginable. If a tube doesn't meet his specs, he throws it in the garbage.
dalorzof OP
9 posts
 
Thanks for the tip.
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samzx12
1,220 posts
 
Oh I definitely understand trying something new and didn't realize you were in Australia.  I just couldn't warm up to the 120 at all. Had great bass, drive and separation however, the mids were dry and couldn't tune it out with Mullards. Your mileage may vary but I would look into a Gold Lion KT-88 or the Tung Sol KT150. The 150's tone wise kill the 120 and sound a bit more relaxed like a EL34.  Of course my Dialogue Premium was designed around the EL34 even though it can utilize just about any power tube so your amp may sound better with the 120.  Just read reviews and trust your gut :)

P.S. Andy at Vintage Tube Services does know his tubes also. I dealt with him just a few years ago. Super nice guy. 

Sam
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