Success Rolling Opamps in EE Minimax DAC

Mechans,

If SOTA means chips like the ESS Technology 9018, I believe the DAC chip alone is over $50 if you buy in quantity. For instance: The ESS Technology ( I believe the number is 9003 Dac chip) is about $5 in comparison.

We tried to bring the best and many pro audio components use the op-amps we chose in the DAC as it is very reliable and sounds great.I've had other customers use other op-amps in the MiniMax DAC and a couple reported feedback that we chose wisely, as other op-amps they tried might have improved in one area but degraded sound quality in other areas.
I believe Chris from Clarity Cables had great success and recommended to Doug to try the op-amps that Doug used with similar great sonic results across the board.
I haven't tried the op-amps yet but will order some shortly for sure because I trust Doug's ears.

Douglas_schroeder, Audio was ignored for a long time in op-amp design NE5532 being the first designed specifically for the audio. I'd like to try the newest OPA1612 that according to technology progress supposed to be light years ahead but I already read post claiming that in comparison its sound is too sweet and too laid back. My Benchmark DAC1 opamps are SMT but it is OK - I can replace them quickly but Benchmark's 5 years warranty speaks against it.

Doug, firstly thanks for your article. Indeed that is an inexpensive upgrade. However, I am confused. The eastern Electric Minimax DAC I recent purchased (and love) has a tubed output. The pictured DAC is also tubed. Have you bypassed the tubed output in favor of the opamps and their upgrades? If so, how does the upgraded opamp compare to the tubed output. Am I missing something here?

Douglas_Schroeder, just out of curiosity...why were 2 different opamps (LME49720 and LME49710) used instead of just one type?

Tgrisham, yup, that's the EE DAC, with the tubed output. Chris at Clarity Cable said he prefers the SS output with the opamp change, and with the volume control full tilt i agree. But I like the tubed output better under specific conditions delineated just below. You can use either with the opamp change.

I have been varying the EE DAC's output as it very subtly influences the interplay between it and the VAC Signature MkII Preamplifier. I have been working with the DAC's volume control anywhere between 1 O'Clock and 5 O'Clock on the dial. I find the use of an additional quality preamp exhilirating, and experimentation has to my ears shown that interplay between the two volume control settings can yield a preferable result to simply taking the DAC full tilt into the preamp.

Regarding the efficacy of the Opamp rolling compared to the stock unit, the upgraded opamps easily outperform both the SS and tubed function of the stock unit, imo.

Jdec, I'm not sure of the reason precisely for the difference in the two opamps for the upgrade. I believe it has to do with the different circuits for the tubed and SS operation. I would not want to speculate further than that; Chris at Clarity Cable told me precisely which Opamps and which locations to place them. He did say that one set of Opamps runs with the tube and the other SS.

I did not try reversing them, and would not advise it unless Chris or another expert gave the ok. I certainly do not want to lead people astray on the tweak. As Bill from Morningstar Audio said, if you mess with the unit you void the warranty. So, I certainly would not stray from the explicit instructions given by a pro like Chris.