Carvin MTS3200, MTS3212 Owner`s Manual

How to bias:

MTS3200, MTS3212

Rev A

8/1/2008

carvinservice.com

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Only a certified technician should bias Carvin amps, this is very
dangerous, you can get hurt, please be very careful when working
with any tube amp!

If you have changed the tubes make sure they are a matched set. When you bias the
amp at 100ma and the tubes are matched you will have the desirable 25mA going
through each of the 4 tubes.

-The Bias for the X100B, X212B should be 100mA at 100W setting, with 120VAC.

STEP 1

These are the tools you will need:

1. A flat head screw driver

“small”.

2. A multi-meter, w/ milli amp

STEP 2

reading.

3. Banana to clip leads.

4. Amp stand (optional).

Take the amp out of the amp
enclosure (cabinet). Set it in an amp
stand. Be very careful with the tubes
they can break.

NOTE: If you don't have an amp
stand then support the chassis on
some blocks of wood so that the
power tubes are not touching
anything - they get very hot!

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STEP 3

STEP 4

Plug in speaker to output 1 or 2, they
are both the same, both jacks are in
parallel.

NOTE: For speaker setup click on
“Troubleshooting” and “Speakers”.

IMPORTANT: Do NOT turn on the
amplifier without a speaker plugged
in!"

STEP 5

Make sure the OHM setting is
correct. Improper setting will result
in damage to the amp!

NOTE: On the back is where you
will find the OHM setting, make sure
the speaker matches the OHM
setting.

Set the switch in the back to 100W
4-tubes.

NOTE: This step is very important,
if you don’t set this to 100W setting
you will not get the correct bias
setting when you adjust it later in the
procedures.

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