The Schotky Cree diodes make a tremendous difference in every place I have used them.

97.95.43.235

Posted on December 27, 2016 at 21:58:09

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005

I just put in a pair in my Heath AA-11 preamp and made an already incredible preamp that much better..The backgrounds and the upper crust extension and midrange depth is more pronounced and the noise floor dropped .43db on measurement.That's quite a bit as it was already a quiet preamp after I rebuilt and upgraded it.
I use the insulated ones in the preamp and these are 600v at 4 amps but you can use 2 amp but they aren't much cheaper.These diodes are only a couple bucks each but well worth it. I'm addicted to these things.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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Wich ones..

Scholl

04:35:49 12/29/16

RE: Wich ones..

Eli Duttman

09:13:37 12/29/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

petercapo

11:12:41 12/28/16

4

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Show full thread outline!

Wich ones..

Scholl

04:35:49 12/29/16

RE: Wich ones..

Eli Duttman

09:13:37 12/29/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

petercapo

11:12:41 12/28/16

4

All diodes produce DC, yes?

Timbo in Oz

16:39:46 01/10/17

but...

PakProtector

09:31:21 01/16/17

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

Michael Samra

14:43:04 12/28/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

Eli Duttman

11:21:09 12/28/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

DaveV

09:52:13 12/28/16

I had positive results with Schottkys in a PAS filament supply

1973shovel

07:39:49 12/28/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

mr9iron

01:06:34 12/28/16

6

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

Michael Samra

19:34:47 12/28/16

4

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

mr9iron

22:23:42 12/28/16

3

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

Eli Duttman

13:06:41 12/29/16

2

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

wheezer

14:27:51 01/03/17

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

Michael Samra

13:35:14 12/29/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them.

sony6060

07:06:42 12/28/16

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 01:06:34
mr9iron Audiophile Posts: 454 Joined: March 13, 2002	Mikey how are you mounting these in your restorations, VS the axial lead type diodes. I just ordered some but not sure how to set them up, can you post some images?

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 07:06:42
sony6060 Audiophile Posts: 1465 Location: USA Joined: August 8, 2014	Like different rectifier tubes make a sonic difference, I am sure solid-state diodes would also make a difference.

I had positive results with Schottkys in a PAS filament supply, posted on December 28, 2016 at 07:39:49

1973shovel
Audiophile

Posts: 10117
Location: Greenville SC
Joined: February 25, 2007

I modified a Dynaco PAS years ago (Vorhis Last PAS) and used 1N4007s to replace the selenium rectifier in the filament supply.

After reading so much about Schottky diodes here on the Asylum, and with Eli Duttman calling 1N4007s "bat guano", I decided to try replacing them with two 31DQ10, 3 amp, 100V Schottky diodes.

There was a noticeable improvement in the sound of my preamp, for a total cost of about $1.

31DQ10

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 09:52:13

DaveV
Audiophile

Posts: 513
Location: SC
Joined: December 26, 2009

Mikey,

Are you talking about a T0-220 package with isolated tab like the one in the link?

http://www.digikey.com/products/en?mpart=C3D02060F&v=1697

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 11:12:41

petercapo
Audiophile

Posts: 665
Joined: December 29, 2012

Mike, what's the deal with using the Cree ZRec SiC schottkys in series? You need voltage equalizing resistors selected to pass the equivalent reverse leakage current or something like that?

Sonically, three different pieces of equipment I have used these in have a black background - very nice. But, wondering if in one case it might possibly add a little edge to the mids, but I am not sure.

I recall reading something at Vacuum Tube Valley a while ago where they seemed to favor schottkys

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 11:21:09
Eli Duttman Audiophile Posts: 10455 Location: Monroe Township, NJ Joined: March 31, 2000	Without voltage equalizing resistors, there is CONSIDERABLE risk of cascading parts failures. Eli D.

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 14:43:04
Michael Samra Dealer Posts: 36118 Location: saginaw michigan Joined: January 30, 2005	Putting balancing resistors on series connected diodes is nothing new.They did this back in the 60s on the Allen Organ amps but you can use 1/4 watt resistors there.This is stock and needs rebuilding but notice the balancing resistors. "For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 19:34:47
Michael Samra Dealer Posts: 36118 Location: saginaw michigan Joined: January 30, 2005	Jeff When you have the Schotky lettering facing up at you and pins pointing down,the pin to the right would be the same as the banded end. "For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 28, 2016 at 22:23:42
mr9iron Audiophile Posts: 454 Joined: March 13, 2002	Mikey, right I get that on the direction, but what I was wondering is how you are physically mounting the diodes and connecting those leads...in other words the axial type are held suspended by solder joint, and or mounted in a cradle clip like on the citation II. .. But these guys are like chips with the leads facing out like a fork... Thanks! J

Wich ones.., posted on December 29, 2016 at 04:35:49
Scholl Distributor or Rep Posts: 1357 Joined: March 8, 2001	Are you using in tube pre and power amps and do you heat sink them? Do you think they'd benefit a 300watt per channel MOSFET amps? Thanks, Scott

RE: Wich ones.., posted on December 29, 2016 at 09:13:37
Eli Duttman Audiophile Posts: 10455 Location: Monroe Township, NJ Joined: March 31, 2000	Scott, For 600 PIV use Cree's C3D02060F. For 1200 PIV use Cree's C4D02120A. Both are rated for 2 A., which should be quite sufficient in tubed circuitry. The fact that Schottkys are switching noise free should help in SS amps too. What sort of PIV and current capability fit your 300 WPC situation? Parts availability and possibly cost may be issues. Eli D.

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 29, 2016 at 13:06:41
Eli Duttman Audiophile Posts: 10455 Location: Monroe Township, NJ Joined: March 31, 2000	You can buy 5 A. rated parts and saw the metal tabs off. You definitely don't want the tabs sticking up into the air and acting as an antenna for EMI/RFI. Form the leads with pliers. Eli D.

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on December 29, 2016 at 13:35:14
Michael Samra Dealer Posts: 36118 Location: saginaw michigan Joined: January 30, 2005	Eli I bought some that are insulated that are fantastic. "For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

RE: The Schotky Cree diodes make a tremendous difference in every place I have used them., posted on January 3, 2017 at 14:27:51
wheezer Audiophile Posts: 4309 Joined: January 24, 2001	Any suggested tips or techniques for removing the tabs from the TO-220 tab?

All diodes produce DC, yes?, posted on January 10, 2017 at 16:39:46

Timbo in Oz
Audiophile

Posts: 23221
Location: Canberra - in the ACT - SE Australia
Joined: January 30, 2002

Schottkys have very low, almost non-existent, out of band switching harmonics. So, other than through a higher and very clean HT DC voltage, how can you 'hear' them?

IME the sound quality improvements from soft recovery (SR) quiet SS diodes in valve amps is the far higher energy storage you can achieve:- they don't have severe PIV limits and the HT is also higher.

The energy storage is a f'n of the voltage squared so added to 300V even 10 extra volts has a large effect.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

but..., posted on January 16, 2017 at 09:31:21
PakProtector Audiophile Posts: 12363 Joined: May 14, 2002	current output is a function of capacitance straight up. In this case, I=C*di/dt...more capacitance results in less change in voltage for any given signal. cheers, Douglas Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

Vintage Asylum

The Schotky Cree diodes make a tremendous difference in every place I have used them.

97.95.43.235