2. amps-preamps
  3. 1387971405

Replace 12AU7 with 6SN7 ?

Hello Guys !
I own Ayon Triton (integrated, but use only the Power section) with 6 12AU7 an 8 KT88.
I read in some threads that the 12AU7 can be easily replaced by 6SN7 (which I have 4 of them and enjoy in my Preamp).
This to be done by a "socket converter" (available on eBay) which internally makes the required wiring for the filaments to allow the replacement.
The reported results were positive.
I asked the manufacturer the same question and the answer was "straight forward", "quote":

DO not use 6SN7 or any others as the original types are. IMPORTANT – otherwise your amp will be destroyed.

Does anybody have any experience with replacing drivers like 12AU7 to 6SN7 in Pre or Power ?

thanks.
amiglick
Post removed 
bigkidz
3,381 posts
 
Simply replacing 12AU7s by 6SN7s would double the filament current drawn (3.6 amps vs 1.8 amps for 6 tubes). That could easily burn out the power transformer if its rating is marginal.

The above statement is correct. Unless you can measure this yourself, and are capable of modifying your amp yourself, then don't try to swap out the tubes. Overall the amp would operate but you don't know how the current will effect the other parts in the amp. Most tubes will operate in a range and obviously if it all matches, the better the unit should sound. Therefore, the manufacturer should know what is best for their design.

Happy Listening.
reynolds853
385 posts
 
Amiglick,

I own a Triton 1 and if you don't mind me asking, I'm curious about what is your goal for considering this change?

Also, what 12AU7s are you presently running in the amp?
amiglick OP
2 posts
 
Reynolds853

Thank you for your post.
I have a preamp. which use 6SN7 tubes.
The NOS 6SN7 have an outstanding timbre which I want to implement also in the TRITON by replacing the 12AU7.
In the TRITON I use 12AU7 NOS Amperex from the 50's.

Regards.
amiglick OP
2 posts
 
Almarg

Al, thank you for your professional analysis.
The facts are:
"the component is designed to operate the 12AU7 at 6.3 volts (with the two halves of the filament in parallel), AND the power transformer can comfortably supply the doubled filament current that would be required by TWO tubes"

I am closely supported by a well experienced "TUBE" guy and it gives me confidence in what I am doing.

I will replace 2 tubes and monitor the changes (if any).
If the change will reflect subtle improvement, I will consider to modify the equipment so it will handle the replacement of all the SIX tubes.

I will post my results here for the benefit of the 12AU7 users.

Thank you all.

I
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