BIAS ADJUSTMENT PROCEDURE:
-Power up unit and connect proper speaker load
-DO NOT have an instrument connected to the input during the biasing procedure!
-Take unit off standby and allow a few seconds for the circuit to stabilize.
-Set multi-meter to read DC Volts
-With meter grounded to chassis and + probe inserted into test point, measure voltage.
-Using a small flat head screwdriver, insert into Bias pot and turn slowly adjusting Bias level
It is recommended to only use exact replacement tubes similar to what is installed at the factory.
Be careful when deciding to install other types of 6L6, 6V6, or EL-34 based tubes. Not all have the
same specs and some
can’t handle the plate voltage of the amplifier.
To bias properly make sure the amp is the correct power setting. High Power and Low Power bias
pots are tied to the Standby switch and the 2 Power selections.
Bias Ranges: Are measured and set in Volts. But can be measured and set in milliamps.
6L6 type tubes: .060V to .070V for 50watt Factory Setting: .064V
Do not set bias higher then recommend levels as it can lead to tube failure or failure within the
amplifier!
WARNING!
No user serviceable parts inside! Refer to qualified service person only.
LINE CORD- For your safety, connect to a grounded A/C receptacle only.
Summary of Contents for studio 50-15
Page 1: ...OWNER S MANUAL...
Page 9: ......
