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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
PN4391 Transistors
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LektroiD



Joined: Aug 23, 2008
Posts: 1017
Location: Scottish Borders
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PostPosted: Thu Jun 25, 2009 1:56 am    Post subject: PN4391 Transistors
Subject description: Soundlab Ultimate show-stopper
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Has anyone got some of these in the UK? I need 3 to build the Soundlab Ultimate (but would prefer a few extra in case the expander needs them).

They are virtually impossible to get hold of in the UK, the only ways of doing it is through eBay who want way more than their value, plus extortionate postage. Or to buy from a US distributor, where you have to buy a bulk load of components along with them, again with shipping. I can not justify buying the kit while it has rare parts which are astronomically priced.

I have asked in another Soundlab Ultimate thread if there is an equivalent, but there doesn't seem to be. In my opinion, these should come shipped as standard with the kits for overseas buyers, as they are almost impossible to source. I can't justify buying this kit while it uses expensive, hard to get components though.

If anyone can help me out with the 3 that are needed for this project, and maybe a few extra (in case the expander requires them when it is ready), I would be most appreciative. I'm happy to cover reasonable shipping to the UK. I'd even be happy to pay a little extra to get some shipped with the kit.

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ChrisR



Joined: Feb 22, 2009
Posts: 24
Location: Dark side of the room

PostPosted: Thu Jun 25, 2009 2:48 am    Post subject: Reply with quote  Mark this post and the followings unread

banzai carries the 2N4391.
i don' know if it's a real substitute for the PN4391, but it's cheap enough to try. Smile
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magman



Joined: Feb 04, 2009
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Location: Liverpool, UK

PostPosted: Thu Jun 25, 2009 8:25 am    Post subject: Reply with quote  Mark this post and the followings unread

I've not actually tried this, as I don't own a Soundlab Ultimate (at least not yet), but it looks like a J111 is a close equivalent, apart from the IDSS Min, from the attached comparison:

http://www.nxp.com/acrobat_download/selectionguides/SC07_SELGUIDE_1999_1.pdf (go to the 4th page)

It looks like you can source in the UK for about 20p, so it shouldn't be took expensive to try anyway.

If this doesn't work, it looks like you may have to fall back on an order from Mouser. I ordered from them last month (for some Oakley midiDAC parts I was struggling to get in the UK) without too many hassles, apart from the import duty and VAT, which you effectively pay on parts in the UK anyway. If you can build up enough of an order (what other parts do you need for your Ultimate?) then you can even get free carriage.

Good hunting

Magman
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Skrog Productions



Joined: Jan 07, 2009
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PostPosted: Mon Jun 29, 2009 12:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello, on the documentation about the sondlab plus, Ray mentions the PN4391 is his new substitute for the older MPF102, when i built my original soundlab i used 2N5457 N-channel jfet's as a subst. for the mpf102's.
Rapid has these for pennies.
Hope constuction goes well.

David
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v8pete



Joined: Jan 27, 2008
Posts: 43
Location: UK

PostPosted: Tue Jul 21, 2009 3:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

2N4391 and PN4391 are equivalents - but package types may vary!
Pete
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