Several years ago I bought from the forum a Muse Mini Dac TDA1543 X 4 NOS Optical input from the TV & Coaxial input from the DVD player. The Muse had been modified as shown on a long thread on Head Fi. the output caps were removed then the PCB holes were bridged it also had the small bypass capacitors removed even with DC in the output. I lost the switching wall wart & added a linear 9v PSU
These mods worked well great bass, mids, however the treble after some industrial tube rolling in the pre-amp & power-amp with some unusual valves has increased resolution incredibly across the board I detected a hint of harshness/grain, I read on the same Head Fi thread about using fleabay sourced Russian PIO 5% capacitors OKBG-MH 1.0uF 600V @ £1.50 each( they must have cost a fortune to make) they are enormous.
My son who after building a stunningly good Nuvista pre-amp schematic off the TNT Audio site has the soldering iron bragging rights in our household, he removed the bridges; then he soldered lengths of cat 5 wire to the PCB
Surprisingly in my system these Russian Caps are better than NO Caps DC now gone?. Now the Bass was full and articulate , mids lush? Treble airy and sweet no hint of grain...initially I had no desire to bypass the caps on the Muse.
A friend of mine who designs/sells sound equipment ie just about everything valve was in town on business, he was listening for the first time to music on my system via the turntable; he was I believe amazed at what he heard he said he would have my Quad 57's in a heartbeat he could not believe their bass output; surprising as he uses various transmission line speakers & horns. After listening to a DVD he suggested I bypassed the P10 caps on the Muse DAC with 5000- 10000 pf silver mica caps.
I thought for £3 at the time and 5 minutes work ok. The pair of 5420 pf 350v 2% Russian silver mica caps My soldering iron wielding son is away, as I did not need to open the case I stuck them to the giant P10 Russian caps with double sided tape used cat 5 twisted copper pairs to solder across the P10 caps (bypass).Still smooth but much more detail shimmering treble with natural ambience, bass deeper & better defined. mid's more natural. The Muse Mini Dac TDA1543 X 4 I don't think is still available now, worth buying S/H.