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Paradise phono stage

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#1,411
@avinunca, current mouser bom for the main boards and calvins Inc sk75 heatsink is about £330 a pair. That includes upgrading nichicon caps to wurth organic polymer 30v and Panasonic fc for the 10uf 25v higher impedance caps.

But that doesn't include binning a s.tonne of 327/337 to match, and likewise cost of matched parts for the calvins.

£400 would be entirely fair.
 
#1,413
Simon1972 said:
@avinunca, Snip
But that doesn't include binning a s.tonne of 327/337 to match, and likewise cost of matched parts for the calvins.

£400 would be entirely fair.
Click to expand...
Given what we now know about semiconductor noise performance, why not consider replacing the paralleled 327/337s by one ZTX 851/951 pair and omit the emitter resistors. No need too spend time matching transistors and you’d lower noise to boot. Of course, some changes will need to be made to the existing circuit but nothing major. Not an original idea it was suggested by Hans Polak.
 
#1,416
Just FYI, the Calvin buffer, even though a good interesting buffer, has significant asymmetries slew rates for fall and rise, and also has a poor big signal response and if used INSIDE a feedback loop it is prone to unstability. Sound wise, I found it to be good, but ultimately I preferred both sonically and technically speaking a BJT diamond buffer.
With that said, not saying to not used the Calvin buffer, but I wanted to share my take on this. 🙂
 
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