===== Hard to find Parts =====

==== Transistors ====

  * 2sa733p - TO-92 PNP
  * 2sc536f - TO-92 NPN
  * 2sk30AY - JFET 
  * 2sk30AO - JFET
  * 2sc2291 - SIP matched pair with common base
  * 2sc1583 - SIP matched pair with common emitter

==== ICs ====

  * AN6562 - Dual Operational Amplifier
  * LA4140 - Amplifier
  * ba6110 - VCA SIP 
  * ba622a - VCA SIP - extremely rare, see Ba662aSources