Vintage Synth Repair

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?

am i right?

thanks in advance for your help,
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. musicamaximamagnetica. com

www. vu-us. com

--- On Thu, 7/22/10, Brian <brian@...> wrote:

From: Brian <brian@....uk>
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







 



  


    
      
      
      







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. 

   



Regards 

Brian G3OYU 



   







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)? 





   

   







hi list,



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.



are these two transistors basically the same?



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)



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.. .) 



any help?



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