2. amps-preamps
  3. 149541-88714

Let's roll: what pre-amp tubes should I consider next?

I am looking for some guidance from experienced vacuum tube amp users. I have a Unison Research S6 (most recent model) which runs six x EL34 power tubes and two x 12AX7 pre-amp tubes.

Having gone NOS in the pre-amp section, I've had great results over the new manufacture Tung Sol 12AX7s that come stock with this integrated. The tubes I've played with are the Philips Miniwatt 12AX7s and the Siemens 12AX7s. I like what both have to offer, but there are differences. The Miniwatts being warmer and contributing to an overall more subtle listening experience whereas the Siemens are more precise, producing a sound that has attack, excitement and thrill in abundance. However, I find the latter can be a bit too much in the upper mid/lower treble region some times. Is there another new manufacture (thinking Psvane?) or NOS (Brimar, Mullard, Mazda) that would give me the best of both worlds? Good tone and timbre while maintaining a sense of involvement through speed and attack?

What are your recommendations?

funcrusha


funcrusha

Showing 1 response by audition__audio

audition__audio
1,634 posts
 
A Telefunken smooth plate 12AX7 might hit a good balance between the Amperex (Philips) and Siemens.

I dont like any Mullard 12AX7. I also dont care for any U.S. made 12AX7 except perhaps for the old stock Tung-Sols.

If you can live with roughly 30% less gain, 5751s are great tubes. Best of these are: Raytheon Windmill Getter (double mica), GE and Sylvania triple mica black plates. For less money, the double mica Tung-Sol is also good.


More to discover