Has anyone built Andrea Ciuffolis Phono End ? - diyAudio
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Old 13th March 2013, 09:21 PM   #1
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Join Date: Mar 2004
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Default Has anyone built Andrea Ciuffolis Phono End ?

Hi-end phono preamplifier
This looks like an interesting project as I use c3g's in my phono amp. I thought I might ask if anyone has had experience with this amp and its sound before I fork out the money for the it trannys
Thanks
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Old 14th March 2013, 06:25 AM   #2
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I briefly looked at the link you gave and some comments:

The author says: "No capacitors on the signal path..". Bothe tubes have 220 uF cathode bypass capacitors, which certainly are inside the signal path.
Similarly with resistors that was mentioned to not exist in the signal path.

There was also a FFT-plot that shows that 50 Hz hum is only 40 dB below signal level.
This is - if true - a very poor situation. I would not accept less than 60 dB.

The frequency response seems to vary from RIAA curve some -2 dB at the bass end and +3 dB at the high end.
I would not call anything as Hi-End with such frequency response.

The author calls his project as: "no compromise phono preamplifier without budget limit".
I would say that there are many compromises and thus only average class performance.

Last edited by artosalo; 14th March 2013 at 06:29 AM.
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Old 14th March 2013, 03:09 PM   #3
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I haven't tried the Ciuffolis design but I am familiar with a similar design described on Stephen Robinson's website (Izzy Wizzy Audio). He uses a D3a for the first stage and 5687 for the second.

Izzy Wizzy Audio

One benefit of Stephen's design is the flexibility of adapting it to cap coupling for either the interstage or output. Also for running the D3a in pentode or triode. My version started out like what's shown as Mk 15 on Stephen's site but has gone through many iterations since then.
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Old 15th March 2013, 03:35 AM   #4
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Default thanks for advice

Maybe i will stay with my preamp as I am happy with it. I am glad i did ask as andreas design has AUD $1500 worth of iron in it.
Nick
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