I blew my Marshall 100DFX and ISP Decimator last night, terrible timing seeing as I have a session this weekend (luckily I have a Mesa rig for primary parts). Anyway, just wondering why it happened...

I was running a line from the speaker connection on the amp through my Palmer PDI-03 (speaker simulator) then into my soundcard. While doing this, I unplugged the guitar, and touched the unconnected jack against the Decimator. The amp blew immediately (power died instantly), when I came back 5 mins later, the Decimator was dead...

Could a charge have transfered from the Amp to the Decimator or vice versa across the guitar line? I didnt think that was possible... I don't want to make the same mistake twice, if anyone knows why this might have happened let me know. Thanks..