TUBE COMPLIMENT
V1 - Preamp 12AY7 (Use a 12AX7 for added gain)
V2 - Phase Inverter 12AX7
V3, V4 - Power 6L6GC
V5 - Rectifier 5AR4
Each fine production tube is tested and matched to our exacting specifications. When the time
comes that the power tubes need replacing, it’s very important to use high quality, matched sets of
power tubes. It’s also critical that the bias of the amp be reset after installing new, or NOS power
tubes. External bias adjustment and test points are located on the bottom of the chassis near the
output tube sockets. A digital voltmeter and small screwdriver are required for bias adjustment.
BIAS PROCEDURE:
1. Make sure the speaker is connected properly, then power up the amplifier
2. DO NOT apply any signal to the input during the biasing procedure!
3. Insert the volt meter’s positive probe into the bias test point socket
4. Connect the volt meter’s negative probe to chassis ground
5. Switch the amp out of standby and allow a few seconds for the circuit to stabilize
6. Set the voltmeter to millivolt scale (or lowest volt scale 60 millivolts =.060 volts.)
7. Observe the display on the meter to see the current bias setting
The Burnside amplifier is built to use 6L6GC power tubes.
Factory Bias Setting: .030V
*Bias ranges are measured and set in volts
*Do not set bias higher than recommended levels as it can lead to tube failure and possible damage to other components
in the amplifier!
(NOTE: Burnside amps built prior to 2020 were equipped with 6V6GT power tubes.
The correct bias setting for amps with 6V6’s is .020V)
WARNING! No user serviceable parts inside! Refer to qualified service person only.
LINE CORD- For your safety, connect to grounded A/C receptacle only.
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