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Phono stage 12AX7s- you should keep the sockets filled

beppe61,

Although you are not using the phono stage 12AX7s, the power supply of the preamp "expects" the load- you should keep tubes in those spaces. I don't know the implications of leaving the sockets open, but it may throw the power supply out. I hope others will comment

Certainly, no one wants to waste nice NOS tubes that aren't being heard, so I would recommend buying a couple of Sovtek 12AX7LPS to fill the spots. The Sovtek LPS is actually quite good for a current 12AX7 by the way.


Cheers,

Bambi B


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