Vintage Synth Repair

Bakis
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:
>
> btw, in their datasheets, says that both the K30A-O and K30ATM-O are JFET's.
> 
> so, i guess, this means that both are not NPN or PNP transistors, right?
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> am i right?
> 
> thanks in advance for your help,
> Bakis.
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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. musicamaximamagnetica. com
> 
> www. vu-us. com
> 
> --- On Thu, 7/22/10, Brian <brian@...> wrote:
> 
> From: Brian <brian@...>
> Subject: RE: [vintagesynthrepair] K30A-O same as K30ATM-O (to use for korg PS-3100 SG boards)?
> To: vintagesynthrepair@yahoogroups.com
> Date: Thursday, July 22, 2010, 10:49 AM
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> Not knowing the devices you specify I cannot be certain but I
> suspect that one device is n NPN transistor and the other is a PNP.  They are
> NOT interchangeable. 
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> Regards 
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> Brian G3OYU 
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> From: vintagesynthrepair@ yahoogroups. com
> [mailto:vintagesynt hrepair@yahoogro ups.com] On Behalf Of Bakis Sirros
> 
> Sent: 21 July 2010 6:46
> 
> To: vintagesynthrepair; KorgKornucopia group
> 
> Subject: [vintagesynthrepair ] K30A-O same as K30ATM-O (to use for korg
> 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
> (KLM64) for my Korg PS3100.
> 
> apart from the sixty K30A-O transistors, which i will use the K30ATM-O in place
> 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.
> 
> they seem to have really the same specifications, apart from two parameters
> that have to do with voltage:
> 
> the VGS for the K30A-O is (min to max) 0.4 to 5 volts, but for the K30ATM-O is
> -0.4 to -5 volts (they have opposite signs)
> 
> the same is valid for the Vgds for the K30A-O is 50 volts, but for the k30ATM-O
> 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
> conditions, right?
> 
> (i know almost nothing about electronic engineering, so i cannot really
> understand many parts of the datasheets.. .) 
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> any help?
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> many thanks in advance,
> 
> 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
> 
> www. myspace. com/ memorygeist
> 
> www. DiN. org. uk
> 
> www. musicamaximamagneti ca. com
> 
> www. vu-us. com
>