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can i substitute fets in the shaka3?


 
6/22/2000 10:35 PM
Rob P
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can i substitute fets in the shaka3?
hi everyone,  
 
this is my first time posting on aron's forum, i've been reading it a bit recently, so now i'm getting into the action.  
 
i'm just about to build a shaka 3 and hot tubes preamp (among other things - i've been neglecting pedal building for a while) The problem is that i can't readily acquire j201 fets (or irf510 mosfets, for that matter) being in Australia, i have a more limited access to electronics stuff, and i don't really want to go mail order for little stuff.  
 
So, can i substitute other fets for these? like 2n5484, 2n5459, mpf102? etc... what about the mosfets?  
 
any opinions are greatly appreciated.  
 
Rob
 
6/22/2000 11:34 PM
aron
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Rob,  
 
Check out my common asked questions. It lists a bunch of FETs that you can try in the Mini-Booster circuit (which is at the end of the Shaka 3).
 
 
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6/23/2000 12:25 AM
Rob P
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Thanks aron, i'll give it a look.  
 
Rob
 
6/23/2000 3:23 AM
MikeB
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Rob  
 
You can get IRF510s from www.wiltronics.com.au (I got some for some MOSFET-booster pedals) and J201s can be had from Farnell or possibly Altronics.  
 
MikeB
 
6/23/2000 3:44 AM
Rob P
email

Thanks mike,  
 
i haven't seen wiltronics before, i'll check them out. Altronics doesn't have J201's, i'm fairly sure, i might go for the mpf102's unless someone tells me they sound terrible. Farnell has them, and so does RS, but i'd have to get them delivered, which is a bit more expensive than i was planning. I think you have to be a company to get stuff from Farnell, don't you?  
 
Rob
 
6/23/2000 6:44 AM
MikeB
email

My local Altronics does have J201s, although the guy said they have never actually sold any (the box was still full!). If you like, email me separately and I can post you some (they are AUS$2 each).  
 
Farnell will sell direct to individuals if you pre-pay with credit card.  
 
MikeB
 
6/23/2000 1:03 PM
synthbum
So you need someone to tell you that the MPF102's don't cut it in the Shaka 3? I can do so easily.  
 
I bought, installed, and tried MPF102's in my Geofex PCB and I knew right off that it wasn't right. It sounded wimpy and anemic - even when turned up full. So I went and ordered a quantity of J201's from radioshack.com and installed some. My Shaka Braddah 3 immediately turned into King-Kong - powerful, muscular, and LOUD. Big Difference!  
 
Trust me - bail on those MPF's. Mine are now sitting unemployed in a static bag waiting to be used in a less critical circuit.  
 
Also, IMHO...
  • IRF520's rip - Far superior to Ge diodes only. Silicone glue them to the box floor if necessary and jumper.  
  • Put the mid-notch resistor(s) (22K, 47K) on small dpdt's to switch them in/out.
 
 
synthbum
 
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