It is hard to tell if you have an "A" version by taking the lid off. The "A" version upgrade replaced key transistors in the system with better matched ones. Normally, an "A" version would have an "A" sticker on the back of the unit near the serial number. You could call Theta with the serial number and they could tell you what version you have. Also, both the Gen V and Gen Va came in balanced and unbalanced versions. The balanced version added a second DAC to each channel and the circuitry from input to output was a complete balanced design.
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