[REY]

  Right now I have orange drops in there, while the rest are sonicaps, can I use .01 uF sonicaps to bypass those orange drops? the values are 47 nF and 1 nF respectively. The reason I am asking this is the caps being of so small values.
Thanks!

[amandarae]

Right now I have orange drops in there, while the rest are sonicaps, can I use .01 uF sonicaps to bypass those orange drops? the values are 47 nF and 1 nF respectively. The reason I am asking this is the caps being of so small values.
Thanks!

 

Bro,

If you bypass the 47nF and 1nF caps with a 0.1uF capacitor per, you will have 147nF and 101nF respectively which are very large as compared to the computed values of the circuit design. 

[tubesforever]

The 0.001uf or 1nf sets your high frequency RIAA eq point, the 0.047uf or 47nf sets the low eq point.  These effect the RIAA curve on your C2. 

Like Abe says, you've better get back to the values required.  There is no need to bypass these caps.  However you can add caps in parallel to hit the final capacitance you require.   

I am using two 0.00068uf caps to get 0.00136uf for Columbia and DG lps.  This worked out well for this RIAA option.   I put in a three way switch with 0.00086uf, 0.001uf, and 0.00136mf. 

The results are well worth the effort and Jim Hagerman is building this into the upcoming Cornet 3 phono stage.

Cheers!

[Brinkman]

If you bypass the 47nF and 1nF caps with a 0.01uF capacitor per, you will have 57nF and 11nF respectively which are very large as compared to the computed values of the circuit design.

Abe, I fixed your post up a little to avoid confusion, however, your main thrust remains.

REY, you didn't specify what type of orange drops you're using; the 715P and the 716P types belong to the polypropylene line. As the 716P types are metal foil caps, they are objectively *better* than the Sonicaps.

Besides, straying that far from the spec'd value would alter the tonal balance. Tubes has some pretty interesting finds in regards to cap values and EQ which he reiterated in his post here. His other posts on the subject should be informative as well.

Best regards.

[amandarae]

Abe, I fixed your post up a little to avoid confusion, however, your main thrust remains.

Cool!  Thanks for correction.

regards