Vintage Synth Repair

Hi Bakis,

Both of these are N channel JFET's so it will work. The confusion is because the generic datasheet you sent that lists the the 2SK30A-O only shows the magnitude of the voltage and ignores the polarity. All of the other parameters shown are exact except the 2SK30ATM can tolerate slightly more gate current. Make sure the pinout of the TO-92 package matches the schematic and you are good to go.
   
Good luck, Fran
--- In vintagesynthrepair@yahoogroups.com, Bakis Sirros <synth_freak_2000@...> wrote:
>
> hi Fran,
> 
> they both are N channel JFETS.
> 
> anyway, i replied to your email address and sent you the datasheets attachments.
> 
> many thanks,
> best regards,
> Bakis.
> 
> 
> 
> Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
> 
> [Doepfer_a100] group owner
> 
> www. parallel - worlds - music. com
> 
> www. myspace. com/ parallelworldsmusic
> 
> www. myspace. com/ interconnectedmusic
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> www. myspace. com/ memorygeist
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> www. DiN. org. uk
> 
> www. musicamaximamagnetica. com
> 
> www. vu-us. com
> 
> --- On Thu, 7/22/10, narfman96 <narfman96@...> wrote:
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> From: narfman96 <narfman96@...>
> Subject: [vintagesynthrepair] Re: K30A-O same as K30ATM-O (to use for korg PS-3100 SG boards)?
> To: vintagesynthrepair@yahoogroups.com
> Date: Thursday, July 22, 2010, 2:38 PM
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>       Bakis
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> They are JFET's but you are describing 2 different types. The K30ATM-O is a N channel FET and it crosses to the 2SK30ATM. If the K30A-O is a P channel FET then subbing one for the other will not work. Can you scan the page(s) of the datasheets that describe this and attach them?
> 
> Fran
> 
> --- In vintagesynthrepair@yahoogroups.com, Bakis Sirros <synth_freak_2000@> wrote:
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> >
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> > btw, in their datasheets, says that both the K30A-O and K30ATM-O are JFET's.
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> > so, i guess, this means that both are not NPN or PNP transistors, right?
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> > am i right?
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> > thanks in advance for your help,
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> > Bakis.
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> > Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
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> > 
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> > [Doepfer_a100] group owner
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> > 
> 
> > www. parallel - worlds - music. com
> 
> > 
> 
> > www. myspace. com/ parallelworldsmusic
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> > 
> 
> > www. myspace. com/ interconnectedmusic
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> > 
> 
> > www. myspace. com/ memorygeist
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> > 
> 
> > www. DiN. org. uk
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> > 
> 
> > www. musicamaximamagnetica. com
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> > 
> 
> > www. vu-us. com
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> > 
> 
> > --- On Thu, 7/22/10, Brian <brian@> wrote:
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> > 
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> > From: Brian <brian@>
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> > Subject: RE: [vintagesynthrepair] K30A-O same as K30ATM-O (to use for korg PS-3100 SG boards)?
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> > To: vintagesynthrepair@yahoogroups.com
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> > Date: Thursday, July 22, 2010, 10:49 AM
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> > Not knowing the devices you specify I cannot be certain but I
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> > suspect that one device is n NPN transistor and the other is a PNP.  They are
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> > NOT interchangeable. 
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> >    
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> > Regards 
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> > Brian G3OYU 
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> > From: vintagesynthrepair@ yahoogroups. com
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> > [mailto:vintagesynt hrepair@yahoogro ups.com] On Behalf Of Bakis Sirros
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> > 
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> > Sent: 21 July 2010 6:46
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> > 
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> > To: vintagesynthrepair; KorgKornucopia group
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> > 
> 
> > Subject: [vintagesynthrepair ] K30A-O same as K30ATM-O (to use for korg
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> > PS-3100 SG boards)? 
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> > hi list,
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> > i have found all the needed parts for my tech to build the two SG boards
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> > (KLM64) for my Korg PS3100.
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> > apart from the sixty K30A-O transistors, which i will use the K30ATM-O in place
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> > of the K30A-O, for the two SG boards.
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> > are these two transistors basically the same?
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> > i have found the datasheets for k30A-O and k30ATM-O.
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> > they seem to have really the same specifications, apart from two parameters
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> > that have to do with voltage:
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> > the VGS for the K30A-O is (min to max) 0.4 to 5 volts, but for the K30ATM-O is
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> > -0.4 to -5 volts (they have opposite signs)
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> > the same is valid for the Vgds for the K30A-O is 50 volts, but for the k30ATM-O
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> > is -50 volts.(again opposite signs)
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> > but, i guess, that this is the same and has only to do with the measuring
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> > conditions, right?
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> > (i know almost nothing about electronic engineering, so i cannot really
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> > understand many parts of the datasheets.. .) 
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> > any help?
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> > many thanks in advance,
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> > best regards, :-)
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> > Bakis.
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> > 
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> > 
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> > Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
> 
> > 
> 
> > [Doepfer_a100] group owner
> 
> > 
> 
> > www. parallel - worlds - music. com
> 
> > 
> 
> > www. myspace. com/ parallelworldsmusic
> 
> > 
> 
> > www. myspace. com/ interconnectedmusic
> 
> > 
> 
> > www. myspace. com/ memorygeist
> 
> > 
> 
> > www. DiN. org. uk
> 
> > 
> 
> > www. musicamaximamagneti ca. com
> 
> > 
> 
> > www. vu-us. com
> 
> >
>