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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 11th October 2011, 02:32 AM   #11
beeah is offline beeah  United States
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Originally Posted by TerribleT View Post
2. FDPF5N50NZ-ND Beeah said he would use this part. Beeah, how did it work out?
Sorry, can't help you there. I managed to find the original 2SK3563 MOSFETs from a vendor through Amazon - hopefully they're genuine... Can't test yet as I'm still waiting on my Edcor order.
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Old 14th October 2011, 04:49 PM   #12
boywonder is offline boywonder  United States
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Default about those MOSFETs....

I'm curious about the required voltage rating of the MOSFETs......in the TubelabSE it appears that the source-drain voltage can be high, especially when running 300B's at 375-400V or so, since the -ve rail can be upwards (downwards?) of -300V for a difference of 700V or so. It would seem like the 500V rated parts wouldn't stand much of a chance. Are the 2SK3563's and other 500V rated parts only appropriate when running 45's?

Is it as simple as looking at the source-to-drain voltage difference? I suppose the 20K/36K R connected to the source side has something to do with it......do those R's drop all of the voltage?

Last edited by boywonder; 14th October 2011 at 04:51 PM.
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Old 14th October 2011, 04:55 PM   #13
diecast is offline diecast  United Kingdom
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Default I have been gathering parts for so long that...

I got my TSE board on May 2007 and at the time the 2SK2700 was still available here and there and I got some. I also have some 2SK3563 I acquired more recently - the result of "well maybe..." type thought process that means I also have five different sets of coupling caps. I expect there are fellow sufferers out there.

So which is preferable? From the Crss graphs I have it looks like the 2SK2700 may have a lower capacitance but more variable with voltage whereas the 2SK3563 has about 7pF but dead flat.

I do get round to making things BTW. I will post some pictures of my SSE later.

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