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In the Forum: Audio Discussions
In the Thread: Initial thoughts about new/old Lamm ML2s
Post Subject: Shorting Lamm ML2Posted by Romy the Cat on: 3/12/2007

 jessie.dazzle wrote:
"Short the ML2’s inputs and the hiss should be gone"

I assume it is not a mistake, and that you mean short the unused input on each POWER AMP (as opposed to the PREAMP).

(I am currently using the XLR connections because I don't have RCA cables in the correct length)

Is there any advantage (or danger) in shorting the unused INPUTS on the PREAMP?

For the moment I have metal sheilding caps on all unused inputs (pre and power amps), which don't seem to make a difference.

Nope, it was not what I meant. Do following:

1) Disconnect ML2 from preamp.
2) Disconnect any RCA or XLR from ML2.
3) Stick RCA shorting plug into ML2’s input RCA jack (not the shielding caps but shorting)
4) If you do not have a shorting plug then stick RCA male-to-male into ML2’s RCA input and then short the other side of the RCA terminator with any metal object.

What you will go is shorting the grid of the input stage to ground that will kill all externals noise. In this mode the ML2 should be absolutely silent.

Warning: Do not short anything on the preamp’s output or input. A preamp should not be on the picture at all.

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