F5 with 2SK2013/2SJ313 - Page 22 - diyAudio
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Old 27th July 2011, 05:05 PM   #211
AndrewT is offline AndrewT  Scotland
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I support ESP's suggestion that it's worth trying multiple small caps.
I have done similar for decades and some manufacturers go to even greater lengths than ESP. I have a German Power Amp that has 32 electrolytics in parallel for it's main smoothing bank.
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Old 27th July 2011, 05:34 PM   #212
EUVL is offline EUVL  Europe
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Balanced F5 question

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Old 28th July 2011, 08:19 AM   #213
Luke is offline Luke  New Zealand
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Hi Patirck,

does matching caps to 1% make an audible difference, or do you do it because you can?
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Old 28th July 2011, 09:46 AM   #214
AndrewT is offline AndrewT  Scotland
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Balanced impedance connections require matching of transmit and matching of receive impedances.
1% error in balanced matching is not usually good enough for those users who need the advantages of a balanced impedance connection.
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Old 28th July 2011, 10:06 AM   #215
EUVL is offline EUVL  Europe
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What you do not see from the photos are current balancing resistors of 0.05R 1W per cap.

Patrick
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Old 28th July 2011, 05:49 PM   #216
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Default FYI

After reading throught this thread, I was keen on trying some of these fets in upcoming builds. I realized very quickly that they are hard to get a hold of now that it seems Zhoufang's stock is depleted. I have found another source that i believe may be able to loacte the parts in large quantity. After verifying that they are indeed real, I would be willing to offer a group buy if there was interest. Sorry if this is the wrong place to do this, but I did not know where to post, as I am not in possession of them and I am not a vendor
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Old 28th July 2011, 09:02 PM   #217
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I got 8 pairs at 2 USD each from utsource, plus handling and shipping. I am yet to use them for lack of proper heatsinks.
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Old 28th July 2011, 09:18 PM   #218
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Quote:
Originally Posted by Samuel Jayaraj View Post
I got 8 pairs at 2 USD each from utsource, plus handling and shipping. I am yet to use them for lack of proper heatsinks.
The issue I have found with most vendors is the question of the authenticity of the part. Any transistor that is hard to find is up for counterfeit. Zhoufang just said that Toshiba has them officially labeled as Non Stock according to him.

Quote:
Originally Posted by zhoufang View Post
I have a long list of PM that is not answered.
Will reply all of them by next week.
I just come back to Singapore from my oversea posting, service standard will resume to normal.
As Toshiba has discontinued nearly everything that I sell, I'm trying to make a last time buy.
2SK2013/2SJ313 is already No Stock until further notice. That is, if I can secure a last time buy, i will still have it for 2-3 years.
Wish me good luck.
Most places on this side of the isle has them for sale for 5$/piece. I am getting a smaller order to test. Just wanted to let people know of the possibility.

Last edited by buzzforb; 28th July 2011 at 09:20 PM.
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Old 28th July 2011, 10:40 PM   #219
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Samuel Jayaraj View Post
I got 8 pairs at 2 USD each from utsource, plus handling and shipping. I am yet to use them for lack of proper heatsinks.
I have bad news for you utsource parts are fake ! i have some and opened one just to see....very diferent from original !
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Old 28th July 2011, 10:54 PM   #220
juma is offline juma  Serbia
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Quote:
Originally Posted by CeeVee View Post
I have bad news for you utsource parts are fake ! i have some and opened one just to see....very diferent from original !
Can you post some pictures ?
It's a serious accusation and you shouldn't do it without a proof.
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