3
8. Master Volume
The Master control adjusts the overall output level of the amplifier. The level being sent to the Balanced Line Output
is not affected allowing the signal at the mixing console to be unaffected by adjustments during performance.
9. Effects Loop
Pre-Amp Out and Amp In
The Effects Loop (Pre-Amp Out and the Power Amp Input) jacks provide versatility not usually associated with vintage
tube amplifiers. The Effects Send jack (Pre-Amp Out) can be used as an effects send or to slave another YBA. The
Effects Return (Power Amp Input jack) goes directly to the YBA’s power amplifier, bypassing the pre-amp, which makes
a perfect effects return. The Effects Return (Power Amp Input) also lets the YBA be a true slave from another pre-amp.
Note: The output signal of the Effects Send (Pre-Amp Out) is set at 0 VU. When using the Effects Send (Pre-
Amp Out) as an effects loop it’s recommended to use professional-grade signal processing equipment (pedal
effects might not have enough headroom).
10. Line Out XLR, Pre/Post and Ground Lift
The YBA is equipped with a balanced D.I./Line output. You can select a direct, clean signal (Pre-EQ setting which
delivers the sound directly to the Balanced Line Out) or tap the signal after the pre-amp (Post-EQ). Both signals are
routed to the Balanced Line Out before the Master volume. A Ground Lift (lifts Pin 1 of the XLR) is also provided to
help when routing signals directly to other equipment or mixing consoles.
11. Tuner Output
The YBA features a ¼-inch Tuner Output jack to enable direct connection with a tuner without affecting the signal
path into your amplifier.
12. Speaker Impedance Switch and Output
Extension speaker cabinets are connected using the Speaker ¼-inch output jacks or the “Speakon” connector.
Connections to these jacks are in parallel. Using the Speaker Load switch, the output of the YBA300 can be op-
timized to provide the rated full power (300 watts) for selected loads (4-ohms or 2-ohms). The YBA100 is switch-
able between 8-ohms or 4-ohms).
Return
Send
D.I. / Line Out
Lift
Gnd
Pre
Post
Effects Loop
Out
D.I. EQ
Ground
Tuner
Effects / D.I. / Tuner
Effects / D.I. / Tuner
Speaker Load
with ALL Speakers
Connected
ATTENTION: Before powering unit on,
make sure speakers are connected
SPEAKER OUTPUT
SPEAKER OUTPUT
Impedance
4
2
Speaker Load
with ALL Speakers
Connected
SPEAKER OUTPUT
SPEAKER OUTPUT
Impedance
8
4
YBA100
YBA300
