Name: Steve Kennedy
Email: steve@pacair.com
Subject: MM 210 RD 100 - two queries
Thread: 37
Time: Sun, 30 Dec 2001 23:40:50 UTC
To use the 100mV (or 3 Volt for that matter) jack you need what's called an Insertion Cable. This is a stereo (3-circuit) TRS phone plug that has two cables coming out of it, each going to a single mono TS 1/4" phone plug. One is wired to the Tip and one is wired to the Ring (Sleeve is common ground for both). This is a sort of "Y" cable.
One of the mono plugs is the SEND (output) signal from the preamp and the other is the Return (input) back to the power amp.
The main difference between the the 100mV and 3 Volt jacks (besides their relative signal levels) is that the 3 Volt jack is after the entire preamp (post reverb) and just before the power amp. This jack is primarily used to take the 3 volt preamp output jack from a single preamp and drive multiple Music Man amps (power amp section only).
On the other hand, the 100mV jack is after the input sections and tone controls of the preamp but BEFORE the Reverb stage, so your insertion point is pre-reverb. This is the jack to use as a standard effects loop.
Steve