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In the Forum: Audio Discussions
In the Thread: Lamm ml2 voltage 110v to 220-240v

Post Subject: Voltage selection instructionsPosted by jessie.dazzle on: 10/1/2009

Hato,

Its very simple, and can be done without opening the amps.

If you receive the manuals with the amps, you will find that they include clear instructions for voltage selection.

If not, do as follows:

There is a voltage selector built into the IEC socket (where the power cord connects)... You should see the voltage for which the amp is currently set, showing through a little window (for example "120V").

If you have the original ML2s, the socket will look exactly like this:
http://hongkong01.rs-online.com/mobile/search/searchBrowseAction.html?method=getProduct&R=4655389

You will need to open the cover of this socket, which is hinged at the bottom (there is a little notch in the top designed to accept a small flat-blade screwdriver, with which you can gently pry the cover open).

Once open, remove the cylinder that bears markings for various voltages.

Remove the fuse (pay attention to the white arrow... It comes out sideways) and, referring to the table on the rear panel of the amp, replace it with a fuse of the value corresponding to the voltage where you live, as indicated by the table (you will likely be removing 6 Amp Slow-Blows and installing 3 Amp Slow-Blows... 3 Amp SB are good for 220-240V... You'll of course want to have these on hand before the amps arrive). You write that you have around 230V; If you bought the original ML2, you"ll have to decide between 220 and 240, as there is no option for 230, so go with what's closest.

Insert the cylinder so that with the cover closed, the selected voltage indication is legible through the window in the cover.

Close the cover.

Make sure the power switch is off, and connect the power cord.

If the amps are packed in the original crates, you will find that they are wedged in very tightly by all the foam. When uncrating them, you may find it easier to romove the screws securing an end or side panel as well as the top of each crate.

If they've been in storage, or are coming via sea transport, don't expect stellar performance for at least the first few days. If it were me, I'd start with all fresh tubes.

You'll want to have on hand an accurate volt meter and that same small flat-blade screwdriver to set the bias.

Good luck,

jd*

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