600V Schottky diodes on B+

[mwaller]

Hello -
I've read a number of threads about replacing the "stock"  silicon diodes with 600V Cree SiC Schottky diodes to reduce high-frequency noise.  I understand that the RRSF is no longer needed if this substitution is made.
If I install the 600V Cree diodes, which components should I remove from the circuit?  The .01uF 1.6kV capacitors, the 10-Ohm 3W reistors, and/or the 220uF 200V capacitor???  Thanks!
Mika

 

[Grainger49]

Yes and yes.  The RRSF is right after the HV windings and consists of a capacito,r 0.01uf, two resistors, 10 ohms, and a final 0.01uF capacitor.  The caps are from one one side of the HV to the other, the resistors are one in each leg of the HV incoming.  

Does that make sense?

 

[mwaller]

Thanks for the reply!
So, the 220uF cap stays, but the rest can go?
Mika

 

[Grainger49]

Yes, keep all the 220uF caps.  They are what smooth out the lumpy, just rectified DC.

 

[mwaller]

Great, thanks. I will give this mod a try!

 

[mwaller]

WOW! This is a great mod! I was hoping it would reduce some of the slight hum and buzz at high volumes.  It made a very modest improvement in that regard, but it made an unexpected and substantial improvement in clarity and focus!  Stereo imaging is greatly improved, and the music is "drier" sounding and more clear.  Very impressed!

 

[Doc B]

Truth be told I have built my own Seduction chassis based circuits with Crees for a long time. But they are a PITA to install on the T strips and they cost way more than UF4007s, so we never incorporated them into the kit.