When I had TL-5.5 I did quite a bit of tube rolling. I tried the OEM JJ, Telefunken, Siemens, Philips Mini Watt, JAN GE 5751, and finally found RCA 12AX7. RCA was the most musical sounding tubes with smooth highs. I found Wurlitzer branded RCA tubes that worked wonders. I would look hard to find those RCA tubes. I sold the preamp since then, but still have all the 12AX7 tubes I used with it if you are interested.
Help with VTL TL 5.5 Preamp
I recently acquired a Vacuum Tube Logic TL 5.5 preamp. It utilizes 6 tubes: (2) x 12AX7 and (4) x 12AT7. In trying to get to know this preamp, I've rolled several different combinations of tubes, BUT I cannot get the highs to sound smooth and "sparkly."
The preamp images well, has air and texture, is great sounding in the mid-range, good bass slam, etc., but the highs are driving me a little nut... sharp, edgy and too much grain. The highs can get in your face and blow you back a bit.
I've used various combinations Mullard, Telefunken, Mazda and Brimar. Right now, my set up is: (2) Mullard 12AX7A and (4) Brimar 6060 (T-Logo). All the tubes I've tired have been matched.
Any thoughts, suggestions or experiences?
The preamp images well, has air and texture, is great sounding in the mid-range, good bass slam, etc., but the highs are driving me a little nut... sharp, edgy and too much grain. The highs can get in your face and blow you back a bit.
I've used various combinations Mullard, Telefunken, Mazda and Brimar. Right now, my set up is: (2) Mullard 12AX7A and (4) Brimar 6060 (T-Logo). All the tubes I've tired have been matched.
Any thoughts, suggestions or experiences?