• Item: Chip based phono preamp  
  • Type: retro-thermionic “Carbon”  
  • Posted: 26 November 2020  
  • Builder: mwhouston  
  • Country: Australia  
  • Comments: 0  


Finally complete with only one little stuff up that was soon fixed. A mix of MKT, Polyester and low ESR electro caps. All carbon film Rs through. Differential PS onboard. Genuine OPA2134 from RS and machined milspec socket. Two 9V batteries for about 50 to 100 hours play depending on battery type. I often use eBay lithium’s first 100 hours.

Cast Al enclosure with bituminised heavy Al in the bottom for resonance and vibration control. Paint is Epoxy Enamel with an etching primer. The finish is gloss and tough. This one is also called “Carbon” for obvious reasons.

Some don’t like carbon film resistors but I find they produce a very smooth sound but still let instruments shine in their own space. The preamp is new and requires about 50 hours to burn in. Listening to it now with late model Rega P3 and Gerrott P77i cart. Very nice and to think it will improve.


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