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Input Impedance & Effects Loops (Specifically Ampeg B2RE Head)...

Hi Guys,

I've been playing around with signal paths today & have a few questions. I'll post another thread in effects regarding DI's & blending which is where this all came about...

1) can anyone find the input impedance of the B2RE instrument input? is this considered irrelevant? can it be tested? i'm curious really, it seems to be quite a big factor in preamp design though can't find it documented...

2) [edit] err yeah answered my own question regarding the effect loop bypassing the preamp input. its a serial effects loop. thats really annoying. REALLY annoying...

appreciate your feedback :)