[Elecraft] Key Line - My Mistake

[Stephen W. Kercel]

   I  did not look closely enough. I have a K2/100 and it does have a key
   line for external amplifiers.
   What  I  cannot  find  in  the  Elecraft  documentation is the maximum
   current and voltage that it can switch.
   I  am  thinking  of  building  the  QSK  switch  shown on p. 76 of the
   February  2008  QST to run an old tube-type amplifier QSK. That device
   requires a key line that can switch +52VDC at 100 mA.
   My  question  is,  can  Q9  in the 100 Watt module handle those levels
   directly,  or  do I need to use an isolating device like the Ameritron
   ARB-704?
   73,
   Steve Kercel
   AA4AK