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Old 29th September 2010, 05:21 PM   #11
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Is the PCB accurate enough to etch? Can we get the layout files?

What kind of power and rail voltage can we expect/use on this?
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Old 29th September 2010, 05:56 PM   #12
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Power rating is approximately 250 watts (2-8 ohms).
Frequency bandwidth is +/- 3dB from 0Hz-1MHz.

This is a wide bandwidth amplifier, sounds incredible. I understand that the metal can military dual jfets 2N5565's are obsolete and dificult to find, but they are significantly superior to 2SK170's.

Same goes for the output MOSFETS. But I agree that this is a logical upgrade, since all the parts are readily available.
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Old 29th September 2010, 06:06 PM   #13
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Looks like the 2N5565's are 28 bucks for a pair.

I think I may try this amp out though. It looks interesting.
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Old 29th September 2010, 08:40 PM   #14
alex mm is offline alex mm  Europe
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Default PCB at request .....

....new PCB variant with 4 pairs output transistors at request
Regards Alex .
Attached Images
File Type: jpg MOSFET AMPL PCB.JPG (935.0 KB, 10361 views)
Attached Files
File Type: pdf MOSFET AMPL.pdf (182.0 KB, 1837 views)
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Old 29th September 2010, 08:43 PM   #15
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The gate resistor value seems quite low (100R). On lateral mosfet amplifiers that I have rebuilt recently I have used 1K for the N channel and 680R for the P channel. The 2 differing resistances helping to compensate for the different gate capacitance values.
I know that the old Hitachi mosfets are more forgiving than the modern equivalents that most of us have to use.
The driver and output stage are very similar to my modified Rauch DVT 50S, which is what I use in my current home system.
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Old 29th September 2010, 08:57 PM   #16
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Having 4 pairs of mosfets instead of 3 pairs is completely useless, IMO.
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Old 29th September 2010, 09:00 PM   #17
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Alex,
I sure would like to have some nice machine routed pcb's of this amp produced. Does anyone have any reservations to this.
Now how do we get the files to a job shop.

Tad
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Old 29th September 2010, 09:02 PM   #18
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A group buy board or just files to etch my own are fine by me. I actually have been looking something to etch my self as I have a bunch of copper clad.
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Old 29th September 2010, 09:08 PM   #19
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Is it usably stable at 2 ohms?

Could someone post a list of the fets and and their availability/alternates???
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Old 29th September 2010, 09:16 PM   #20
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Doug,
I have never gotten myself involved in etching my own stuff. If the post by Alexmm is to scale, the dimensions are printed on the board, it should not be to terrible hard to transfer to the laser printer and make.
Does anyone know if this a commercially manufactured amp. Where did this design come from? I have been looking for something greater than 100 watts with jfets in the frontend.
Now how hard is it going to be to source most of the specified components. Most of the good Japanese transistors are scarce and expensive here in the U.S.

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