2. amps-preamps
  3. 191886-148003

Seeking a Warm 12AX7 Tube for Preamp

Hi All-

 

I got hold of a newer tube preamp. I bought some match ed JJ 12AX7 tubed and after they burned in for a bit, they sound very strident and bright. Can anyone recommend  a tube brand that will be warmer in the upper mid and high frequencies? I can't afford NOS. I'd like to keep it under $100 for the pair matched. Viva Tubes has the new Mullard reissues, PSVane Art Series, Electro Harmonix Gold Pins, and Tung Sol Gold Pins in their new stock that are matched. Any suggestions?

 

Thanks 

spacecadet65

Showing 2 responses by gotog

gotog
139 posts
 

Brent Jessee has Matsushita made 12ax7 that are very similar to Mullard construction for $110 matched pair. They are listed as: “12AX7 / 7025 Selected Dynascan, Allied industrial or Red Tip Low Noise Japanese made” on his website.

Otherwise, Mullard reissue should work for you.

gotog
139 posts
 

@spacecadet65 how many hours do you have on the preamp? I ask because the original Matisse needed about 100 hours to sound good.  There is also some evidence from owners indicating that changing the 12at7 in this particular circuit has more impact than changing the 12ax7; and it looks like you have already infused some warmth on the 12at7 side.  Would hate for you to go down a rabbit hole of tube experimentation and substituting tube variants that may not be optimal in the circuit if the unit isn't fully burned in yet

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