14. AC LINE IN: Firmly insert the female end of the supplied AC power cord
into this socket. The grounded power cord should only be plugged into a
grounded power outlet that meets all applicable electrical codes and is
compatible with the voltage, power and frequency requirements stated on
the rear panel. Do not attempt to defeat the safety ground connection!
15. FUSE: The B-15R employs a fuse to help protect the amplifier from
damage due to overload conditions. If the fuse fails, replace it only with the
same size and type.
16. BIAS SELECT: Use this switch to match the bias to the type of output
tube you are using. The B-15R is shipped from the factory with 6L6 output
tubes and the Bias Select switch set to the 6L6 position. The only time you
would need to change this switch is when installing EL34 output tubes.
17. SPEAKERS: Use these jacks to connect the amplifier to the internal
speaker and/or an extension speaker. Use heavy duty speaker cables ter-
minated with the proper connectors. The total speaker impedance must be
no less than four ohms and the Impedance Selector switch (#18) must be
set to match the total impedance. The B-15R’s cabinet impedance is rated
at eight ohms.
18. IMPEDANCE SELECTOR: Use this switch to match the amplifier to the
total impedance of your speaker cabinet(s). Use the chart which follows
determine the total impedance of parallel cabinets:
CABINET IMPEDANCE # OF CABINETS TOTAL IMPEDANCE
16 ohms 2 8 ohms
16 ohms 4 4 ohms
8 ohms 2 4 ohms
19. LINE OUT: Use this jack to send a line level signal from the amplifier to
an external amplifier, a mixing console, or the input of an external effect.
20. LINE IN: Use this jack to return the signal from an external effect to the
amplifier.
21. LINE OUT LEVEL: Use this control to adjust the signal level at the
Balanced Line Out jack (#24).
22. POST/PRE: This switch, when depressed, sends a pre-eq signal to the
Balanced Line Out jack (#24), which is not affected by the settings of the
tone controls or master level controls. When this switch is in the out posi-
tion, the signal sent to the Balanced Line Out jack (#24) is post-eq, and is
affected by the settings of the tone controls and master level control.
23. LIFT/GND: This switch, when depressed, lifts the chassis ground con-
nection at the Balanced Line Out jack (#24). This switch should only be
depressed if there is excessive buzzing or hum coming from the amplifier
due to ground loops.
24. BALANCED LINE OUT: Use this XLR jack to connect a balanced line
level signal to a mixing console, recording device, or external amplifier.
25: HIGH FREQUENCY ATTENUATOR: Use this three-position rotary
switch to adjust the output level of the internal high frequency driver. Use
the tip of a flatblade screwdriver to set this switch to the position which best
suits your tastes and playing environment.
26: FULL RANGE INPUTS: Use either of these jacks to connect the inter-
nal speaker to the B-15R’s Speaker jack (#17) by means of a heavy duty
speaker cable. Use the remaining jack to connect to the input jack of an
extension speaker cabinet if desired.
MADE IN THE U.S.A. BY
1400 FERGUSON AVE.
ST. LOUIS, MO 63133
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Power
Speaker Specifications
Performance
Weight and Dimensions
