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Not much in the archives about tubes for this DAC, so thought I'd post this. This is the older version, non 24/96.I was going to sell the CAL Sigma II DAC, so before I closed the box, I decided to go through all my tubes to find the best sounding inexpensive tube to include with the unit for the next owner. I had rolled this unit in the past, and ended up using the Telefunken 12ax7, but I was not about to sell it with the TFK - I need that for my phono stages.
I'll break these into 3 groups.
Group 1: Great sounding - huge bass, extended and delicate treble, huge soundstage. You cant believe you are listening to a $300 DAC. I'd be indifferent between any of these. I may need to do a second round to decide between these.
- old Telefunken 12ax7 (w/ diamond)- push/shove I'd choose this one.
- Telefunken 12ax7, made in germany, no diamond, taller than 1st one, has a backwards L in circle between pins. Siemens? As good as other tfk. Maybe a touch more forward
- Mullard 12ax7a/ecc83 (outline like alien face, no eyes) - very close to the TFK. slightly warmer.
- RCA 12ax7 58-17 black plate. A touch cooler than the TFK and Mullard. super bass.
- Siemens 12ax7 - very good too, a touch more nasal than the 2 tfk tubes.Group 2: natural sounding with decent bass and treble that is not harsh. Either liveable, or really good at something.
- Shuguang 12ax7c - borderline Group 1. Great bass, teeny bit harsher in treble than the old tubes in group1. May not be burned in enough tho.
- Sylvania 5751, gold pins. Great bass. touch nasal
- Amperex 12ax7a/ecc83 75-41 orange print- great bass. Less forward than group 1. More fuzzy images. Good LT listening potential.
- Mullard Ecc83 I63 B9a delta, x between pins - Nice tone, low bass
- Philips Miniwatt ecc83- medium bass, nice tone, nice treble. kindof a baseline tube that is liveable
- EH 12ax7eh - nice sounding, good treble, limited low end. Very similar to the miniwatt.Group 3: Tubes with no bass. No point listening for other characteristics.
- Marconi ECC83 B339 British Made I61 B91. 0 between pins. I did not test this to see how strong it is. Very thin sounding. No bass
- Teslovak E83CCS 9825(I think this was the tube that came with the CAL). Slightly better bass than the Marconi, but not by much.I was going to sell the CAL Sigma, but have now decided to keep in. In fact I may chase down an Alpha.
Follow Ups:
Have you tried Sovtek 12AX7LPS? It has the best average feedback as a current production 12AX7. I would like to hear your take on this tube.
Yes, I also have the LPS..it does nothing for me. Its quiet, thats about it. OK in a phono stage, but no reason to use it anywhere else. I like the JJ better. But, again, the Shuguang 12ax7c is better in every respect.
Group 2:
- GE black plate 5751. Light bass, nice tone and treble.
- JJ 12ax7: very similar to GE. light bass, nice treble.
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