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PostPosted: 24 Jul 2016, 02:29 
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To save me having to try it,

I have a question for someone who may already know the answer, I hope.
This isn't about cost saving.. :D

What is the effect of using snubbed UF4007 on one side of a bridge and Sic Cree on the other side perhaps on the positive outgoing side. Also if its reversed with the Sic Cree on the negative? Hoping someone may know.

I'm assuming the Sic Cree would dominate <<<but is the cut off faster on UF4007?

The idea is just a guess that the UF4007 would block any reverse leakage.

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M. Gregg

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PostPosted: 24 Jul 2016, 05:19 
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Just thinking,

The bridge would probably be better with a Sic and UF in the positive leg and the same in the negative, rather than biased to a diode type in each leg.

Any thoughts?

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M. Gregg

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PostPosted: 04 Aug 2016, 09:57 
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A few more thoughts,

If I had standard snubbed diodes in the positive leg of a bridge and Sic in the negative leg would this give switching similar to a two diode centre tapped full wave rectifier? I am thinking the Sic diodes (in the negative leg) would have the effect of the CT on the mains Tx..ie no switching noise.

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M. Gregg

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PostPosted: 04 Aug 2016, 12:56 
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OK,

as above mixed bridge using Sic Cree in the negative leg of the bridge trying to create an UF twin diode bridge. (Pic)
Positive leg running UF4007 with snubbing using high voltage disk ceramic caps.<<<I'm thinking of trying 500V silver mica but more to think about first. Cree soldered with Oyaide ss-47 solder trying to get a warm balance.

Just testing... :D

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M. Gregg


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PostPosted: 04 Aug 2016, 17:47 
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OK,

Just my opinion..
Changed back to all UF4007 and snubbing.

The outcome of the mixed bridge is what sounds like an increase in clarity. The sound becomes very open but also brighter.
The UF diodes create an older sound with what sounds like more depth to the soundstage. Perhaps more real.

After changing back to UF diodes the initial impression was what's happened to all that clear sound.
It brings me back to not liking Sic diodes perhaps it would be easier to make plug in modules for the rectifier and then I could chop and change. Tried a full bridge as well..

The difference is quite spectacular with the sic diodes, however I have never liked schottky rectifiers (YMMV) the sound seems false and contrived. So more research required.. :confused:

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M. Gregg

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PostPosted: 05 Aug 2016, 02:40 
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In the real sound articles,

There is talk about diodes quote:
RECT—ST Microelectronics STTH6110TV2: This is an ultra-fast, soft recovery, high-voltage diode for industrial use, with good sound that is equal to a tube rectifier.

The package is a bit awkward..not what I'm looking for...

So I'm going to have a look they are UF Soft recovery in the past I have used BYV96E so the search is on..LMAO

Unless anyone knows of a discrete single diode package of the STTH6110TV2..

The BYV96E has a "warmer sound" compared to standard UF so I will have to have a look..again in the past HexFred have been the way to go but by comparison the UF4007 seemed better (in this situation)..so some research perhaps.

Maybe Hyperfast with soft recovery ???

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M. Gregg

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PostPosted: 05 Aug 2016, 07:48 
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OK,

I have gone back to the bridge with the Sic in the negative leg using UF in the positive leg soldered with audio note.
It's not as bright with the change in solder so I am going to experiment with this idea for a while..
Possibly looking at silver mica snubbing.
The UF4007 may be changed to soft recovery for a test.
The reason is I just don't like Sic bridges.. :( I'm finding it quite interesting at the moment..

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M. Gregg

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PostPosted: 05 Aug 2016, 17:29 
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Just comparing,

A full Sic bridge with Hexfred.. :idea:
Looking at the snubbing.


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M. Gregg


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PostPosted: 13 Aug 2016, 02:51 
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Well,

after trying the Sic rectifiers I can't live with them.
So I'm going to try the cheap as chips BA159 perhaps looking at ferrite suppression (just for fun).

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M. Gregg

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PostPosted: 13 Aug 2016, 07:29 
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OK,

So I have fitted the BA159's with an insulated ferrite bead on the cathode of each diode.
Then snub across each one with a ceramic disk. (pic)
Solder with Oyaide (because I have some).

General consensus is that the BA159 is superior to 1N4007 or UF4007.
I have used Diotec after reading this, probably a good sales ploy:
http://www.diotec-usa.com/Diff.html

After a check on the internet guys using them in TV's seem to find the noise very low.
So I'll give them a whirl...

Initial impressions are good.. however its early days as usual.

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M. Gregg


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