Hi guys,
I just finished an upgrade job for a client, it was a stock STE in very nice condition given the following upgrades:
Before any modifications:

- beginning.jpg (519.01 KiB) Viewed 1447 times
Replace the SN74S257N with SN74F257N U405 (Required for 32Mhz booster)

- removed u405.jpg (613.05 KiB) Viewed 1447 times

- u405 socket.jpg (505.95 KiB) Viewed 1447 times

- new u405.jpg (510.61 KiB) Viewed 1447 times
Reset circuit cap replacements

- removed reset caps.jpg (547.13 KiB) Viewed 1447 times

- new reset caps.jpg (564.93 KiB) Viewed 1447 times
UBE TOS Switcher with fast ROM

- removed TOS roms.jpg (578.39 KiB) Viewed 1447 times

- route line under yamaha.jpg (468.98 KiB) Viewed 1447 times
Ultrasatan Micro-USB cable connected to Floppy 5v

- ultrasatan cable.jpg (486.61 KiB) Viewed 1447 times
Exxos 32Mhz STE booster upgrade & 8mhz/32Mhz switch.

- remove CPU.jpg (511.59 KiB) Viewed 1447 times

- booster 32mhz line.jpg (595.35 KiB) Viewed 1447 times

- booster and switch.jpg (485.34 KiB) Viewed 1447 times
New Exxos 110v PSU

- new psu.jpg (421.61 KiB) Viewed 1447 times

- psu on board.jpg (512.48 KiB) Viewed 1447 times
And the rest: New 4700uf cap, Video capacitor upgrade, Install new RAM.

- finished.jpg (528.25 KiB) Viewed 1447 times
Through every part of the incremental upgrades I informed the client with video demonstrations and photographs. The result is a very snazzy STE.