Latest tweaks to the TC-750. Input caps are bypassed with small WIMA film caps (on underside of board). Found some random film caps to replace the electrolytics on the output.Less grainy sound slightly warmer sound (these caps are bigger than the stock, so maybe rolloff is lower). Maybe a tiny bit more plankton. Also bypassed the single diode for the +12V (presumably there in case of user error / wrong polarity). If I get a chance, I will swap out the input caps. I already pulled the 220poof caps because the Ortofon Black doesn't need that kind of capacitive load. This one was significant. Replaced the Sigma 11 power supply with this huge honkin' SOLAHD SLS‑12‑034T power supply. Find them on eBay for well less than $20 surplus. Cut the cable from the stock POS power supply and wire accordingly. Power supplies do have a sound of their own. Sometimes more, sometimes less. It depends upon the circuit. The sonic gains with the SOLAHD were huge. A ton of plankton. I know this will sound cliche, but a ton of ambient and reverberant stuff I've never heard before. That doesn't happen often with me. I might actually prefer this Franken-phono-preamp to the EC Transcription Amplifier, but would need a direct comparison to say. I know many of you may find this difficult to believe, but really, the design of the TC-750 is and pretty solid and uses discrete parts. BTW, the SOLAHD power supplies were used as a development power supply for the BW amp. It was definitely one of the finalists (nicknamed Camaro) but lost out because of its impractical size and weight. (The BW would have required two of the even larger 24V units for bipolar power rails.) I'll measure the power supplies on a 'scope when I get a chance. I know OJ would be interested.