Mosfet mumblings.

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pre65
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Mosfet mumblings.

Post by pre65 » Tue Jun 21, 2016 1:35 pm

I (and others) were impressed by Nicks mosfet amp at Owston.

I was thinking (quite dangerous), if one did not need the all that power could one of those SOT-227 mosfets be used as single ended ? Or am I taking out of my bottom. :lol:

I'm not expecting Nick to give away anything "secret", or divulge details that may compromise him selling the amps commercially.
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Nick
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Re: Mosfet mumblings.

Post by Nick » Tue Jun 21, 2016 3:47 pm

Yes of course.
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Mike H
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Re: Mosfet mumblings.

Post by Mike H » Tue Jun 21, 2016 4:39 pm

Maybe topic should be entitled MOSFET Follies. :D

(There's a fairly well known web page of that name, or was, showing ways of adding MOSFET''s to valve circuits for various functions.)
 
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Re: Mosfet mumblings.

Post by mainscablesrus » Tue Jun 21, 2016 7:56 pm

Having known Mr Gorham for about 7-8 years now and heard most of his offerings (jfet phono stage, F5 amp, ref phono stage which I own) and of course all his various power supplies given its his (probably) first attempt at a mosfet amp I was stunned when it was playing through the Graham speakers I brought with me.

A shitty laptop as source as well I think?

I ordered mine already!
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Mike H
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Re: Mosfet mumblings.

Post by Mike H » Wed Jun 22, 2016 4:49 pm

It is rather good must be said.


:D
 
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Paul Barker
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Re: Mosfet mumblings.

Post by Paul Barker » Wed Jun 22, 2016 8:31 pm

He's a clever cookie.
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Re: Mosfet mumblings.

Post by SimonC » Thu Jun 23, 2016 1:19 pm

Just wondering what peoples thoughts are on P channel vs N channel mosfets for audio use?

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Cressy Snr
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Re: Mosfet mumblings.

Post by Cressy Snr » Thu Jun 23, 2016 1:51 pm

That sounds like a whole new can of worms. :)
And I've been on the pale ale...and I feel like a pinball.

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Re: Mosfet mumblings.

Post by Mike H » Thu Jun 23, 2016 1:52 pm

To be honest I hadn't.

Dunno yet.....
 
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Nick
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Re: Mosfet mumblings.

Post by Nick » Thu Jun 23, 2016 4:29 pm

Just FYI, the mosfets I used were IXTN110N20L2 and IXTN90P20P
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Re: Mosfet mumblings.

Post by SimonC » Fri Jun 24, 2016 1:04 pm

Nick wrote:Just FYI, the mosfets I used were IXTN110N20L2 and IXTN90P20P
Oops, just realised that I assumed you were running single ended off one device, never occurred to me that they were PP. Serves me right for not taking more notice, or even being able to count there were 2 driver boards on each amp :(

Still, its got me mumbling about mosfets again, and re-reading some of Papa Pass's notes about them

Si

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Re: Mosfet mumblings.

Post by Mike H » Fri Jun 24, 2016 8:02 pm

I was told it's p-p, each device is driven with a Nelson Pass F4 amp, then there's a power amp controller front-end chip at the input. I've seen the data for one of these but can't find it now.
 
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Re: Mosfet mumblings.

Post by mainscablesrus » Tue Jun 28, 2016 8:06 pm

Dog with 2 dicks springs to mind when I think about those prototype amps at Owston.
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Re: Mosfet mumblings.

Post by IslandPink » Tue Jun 28, 2016 10:20 pm

I didn't notice that Dave, you had your trousers on :!:
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Re: Mosfet mumblings.

Post by Greg » Wed Jun 29, 2016 12:21 am

mainscablesrus wrote:Dog with 2 dicks springs to mind when I think about those prototype amps at Owston.
Not sure I would express it that way but certainly I endorse the sentiment. Lovely amps.

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