[Amps] Ameritron PIN-5 vs. QSK-5

[sentek at sprintmail.com (Floyd Sense)]

Anyone aware of the differences between the older PIN-5 QSK unit and the
QSK-5 presently offered by Ameritron (talking about the internal board) ?
There are obvious differences comparing the PIN-5 board with a photo of the
QSK-5, but I can find no information describing circuit differences or
deficiencies in the PIN-5 vs. the QSK-5.  Thanks for any info.

K8AC