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catman

'Improving' a cheap phono stage.

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G'day all, tonight I put into service my TCC TC-750 phono stage, a little commercially made unit that I bought some years ago as its circuitry was/is based entirely on transistors.  Since I've owned it I've done a few mods to it that I think have improved its sound like getting rid of that horrible switch mode 12 VDC wallwart supply (noisy) with a 12 volt DC gel cell (a big difference in noise). 

 

I changed the input loading capacitors from 220 picofarads (ceramics) to 100 picofarads (WIMA's) mainly to improve the loading with my M97xE but in any case I like the 'smooth' sound of the WIMA's!

 

I also changed the values of the output coupling capacitors to the values marked on the pcb from the smaller values actually installed.  So how does it sound?  Incredibly 'quiet' with a nice unstrained sound and a nice sense of 'ambience'.  Have I improved it?  Yes I think so.  Regards, Felix.   

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Most commercially cheap solid state small phono boxes have an opamp (dual or pair of singles) just before the riaa circuit, these opamps usually operate on less then - /+14vdc rails and you can almost drop in another opamp for better sound.

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