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In Reply to: 12AU7 as a buffer - suggestion of brand/model. posted by beppe61 on February 13, 2007 at 23:42:41:
Someone previously mentioned the Tung-Sol 12AU7 (the older variety from the 50s) and my experience with them mirrors his. I would describe them as having a very solid bass foundation and a rather big sound. One of very few notable 12AU7s in my experience. The whole 12AU7 family of tubes suffer from mediocrity.To address the lack of resolution and liveliness, I would suggest that you roll the 12AX7 tubes in your pre section, if it indeed does use 12AX7 tubes. I think the potential to change your sound more toward your preferences rests with this tube as opposed to the 12AU7.
Follow Ups:
Thank you very much Sir for your kind and valuable advice.
My preamp has a phono section (2x12ax7) that I do not use and I took out the tubes.
My concern is with the line section, just one 12au7.
I want in that position a tube with a powerful and fast bass.
If I understand well the Tung-Sol 12AU7 can provide that.
Thanks a lot and kind regards,
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,
Dear Sir,
thank you very much indeed for your extremely kind and helpful advice.
I did not know about this risk.
I will put 2 tubes in the empty sockets.
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