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Old 22nd March 2013, 02:22 PM   #41
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I'm using 2SK3564's. They are still available.
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Old 23rd March 2013, 08:51 PM   #42
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Quote:
Originally Posted by imnewbie View Post
Guys who recently bought parts for TSE, I have question. Seems like Toshiba 2SK3563 is not available at Digikey and Mouser. Where did you guys find it or which substitute did you guys use? I have located all other parts.
You can checkout this place...........
Pacific Semiconductors Inc. - Search

or if you want to try Ebay there are sellers mostly from China........
2SK3563 | eBay
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Old 23rd March 2013, 10:04 PM   #43
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I've been looking at them on ebay too. It is tempting to purchase them there. But there have been reports of counterfeit MOSFETs from China. I don't see what's the point of counterfeiting parts that are under $2-3...but it happens for some reason.
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Old 24th March 2013, 01:39 AM   #44
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I bought some 2SK3563 off eBay about a year ago. They didn't look counterfeit, but none of them worked.

I've used the 2SK3564 in two TSE's, one for 45's and one for 300B's, for about a year with no issue.


JP
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Old 24th March 2013, 10:45 PM   #45
myfi is offline myfi  United States
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I bought a few 2SK2700 Mosfets from china off Ebay. They don't look right and I will not be using them. An inexpensive lesson learned. Id stick with a reputable supplier.

Steve
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Old 29th March 2013, 02:20 PM   #46
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How can i know if the mosfets i bought are ok or not without connecting them to the board?

I wish to run the amp on 400v 300B, R14 & R25 supposed to be 36K, i have 33K,
Will it do? What will it effect the grid voltage?

Thanks
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Old 29th March 2013, 09:16 PM   #47
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Quote:
Originally Posted by ranhaber View Post
How can i know if the mosfets i bought are ok or not without connecting them to the board?

I wish to run the amp on 400v 300B, R14 & R25 supposed to be 36K, i have 33K,
Will it do? What will it effect the grid voltage?

Thanks
What mosfets did you buy and where did you get them?
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Old 31st March 2013, 08:19 AM   #48
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I bought them from ebay.
here are the links:
5pcs 2SK3563 K3563 Original Toshiba Field Effect Transistor | eBay
1pcs IXCP10M45S Switchable Current Regulators Original | eBay

What about the 33K resistor insted of the 36K? how will it effect?

How do i choose a fuze for my amp? using 240V, B+ 400V.

Thanks
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Old 31st March 2013, 03:37 PM   #49
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Ran: All of my mosfets and 10M45's were purchased from either Digikey or Mouser, so I have no experience with fakes.

Here are a few pics of my parts for reference. If the printing looks the same (other than lot/date code) they are probably real. Look at the font and other symbology closely.

For the source R on the mosfet, I think the value will change the drain-source voltage across the device based on it's current. Keep in mind that I am not an expert but your slightly lower R value will (I think) slightly increase the drain-source voltage across the device. I'm sure that you would be fine with a 2SK3564 as it has a 900V D-S voltage rating vs 500V for the 3563 although the 3563 may still work fine also.

The grid bias is adjustable with the pot, the drain-source voltage has to be high enough to provide enough headroom for the signal but not so high to put excessive heat dissipation out of the device.

The drain-source voltage across these parts has been a lingering question for me..I suppose that I could measure it in my amp.

The advantage of the 3563 part is that it is a little easier to drive (lower gate capacitance) than the 3564 part, but it has a lower D-S voltage rating.

I have the 3564's in my 300B TSE and 3563's in my 45 TSE and nothing has smoked.

As far as the fuse goes I would pick up some slow blow 1/2 to 3/4 amp fuses.....any buy extras...
Attached Images
File Type: jpg 3563.JPG (669.4 KB, 164 views)
File Type: jpg 3564 2.JPG (681.9 KB, 156 views)
File Type: jpg 3564.JPG (698.0 KB, 144 views)
File Type: jpg 10M45S.JPG (686.5 KB, 139 views)

Last edited by boywonder; 31st March 2013 at 03:45 PM.
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Old 31st March 2013, 05:25 PM   #50
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Many thanks again

And for the record, after i got my transformers i think i will built my Amp with separated PT, like yours.

It's heavy
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