B-15R PORTAFLEX
THE FRONT PANEL:
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1 | 2 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
1,2: INPUT JACKS: Connect the signal cable from your
instrument to either of these jacks: if your bass has active electronics, its output may be “hotter” than normal
–the
3,4: ULTRA HI / ULTRA LO BOOSTS: Engage these pushbutton switches to boost the highs or lows as desired. These switches activate the boosts at their “in” positions.
5:GAIN CONTROL: Adjust this control to suit your instrument’s signal level and your playing style – lower output levels and softer playing styles require a higher setting of the Gain control than high output and “hard” playing styles. Proper adjustment of this control will give you clean sound with the lowest noise.
6:BASS CONTROL: Adjust the low frequency output of the amp with this control: turn the control to the left for less; to the right for more. This control allows a range of ±25dB at 40Hz.
7:MID CONTROL: Adjust the midrange frequency out- put of the amp with this control: turn the control to the left
for less; to the right for more. This control allows a range of ±34dB at the selected frequency (see #8).
8:FREQUENCY: This control allows you to select one of five midrange frequencies: 200, 400, 900, 1.5k or 2.5kHz. The setting of this control determines the effec- tive range for the Mid control.
9.TREBLE CONTROL: Adjust the high frequency out- put of the amp with this control: turn the control to the left for less; to the right for more. This control allows a range of ±30dB at 4kHz.
10:MASTER: Set the overall output level of the amplifi- er with this control. When the Post/Pre switch (#22) is at the IN (“Post”) position, this control also affects the level at the Balanced Line Out jack (#24).
11:
Note: In the 60 watt position the amplifier will deliver approximately 40 watts into the internal speaker. To deliver the full 60 watts into the internal 8 ohm speaker, set the impedance switch (#18) to the 4 ohm setting. Operation at either impedance setting is acceptable and will yield some variances in the tonality of the unit. Experiment with these settings to determine which sound best suits your personal taste..
12:STANDBY SWITCH: Activate the amplifier with this switch, after the Power switch has been turned on.
Always turn this switch off first, on last. Turn on the Power switch (#13) at least 30 seconds before turn- ing on the Standby switch. During breaks, turn the Standby switch off, leaving the Power switch on. This helps promote longer tube life.
13:POWER SWITCH: Turn on the main AC power with this switch. Always turn this switch on first, off last.
Turn on the Standby switch (#12) at least 30 sec- onds after turning on the Power switch.
THE REAR PANEL:
MODEL: |
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SERIAL: | B1500691242 |
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LINE: | 120 V ~ 60 | Hz |
WATTS: | MAX |
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15 | 16 |
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| 22 | 24 |
17 | 19 | 20 | 21 |
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18 |
| 23 |
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14:AC LINE IN: Use the supplied power cord to connect the amplifier to a suitable source of A.C. voltage. This is a grounded,
15:FUSE: This protects the amplifier from damage to overload conditions or power line surges. If the fuse blows, replace it only with the same size and type.
16.BIAS SELECT: Allows for instant bias adjustment when the TYPE of output tube is changed. The setting of this switch must match the type of tube being used! The amplifier is shipped with 6L6 tubes installed.
17.SPEAKERS: Connect the amplifier to the internal speaker and/or an extension speaker cabinet using these jacks. Use heavy duty speaker cables terminated with the proper connectors. The total speaker impedance can not be less than 4 ohms. (Be sure to match the Impedance Selector switch [#18] to the cabinet imped- ance.) The
18.IMPEDANCE SELECTOR: Use this switch to match the amplifier to the TOTAL impedance of your speaker cabinet(s). Use the following chart to determine the total impedance of parallel cabinets:
CABINET | NUMBER OF | TOTAL |
IMPEDANCE | CABINETS | IMPEDANCE |
16 ohms | 2 | 8 ohms |
16 ohms | 4 | 4 ohms |
8 ohms | 2 | 4 ohms |
19:LINE OUT: Used with the Line In jack (#20), this may serve as an effects loop: The signal from this jack would go to the input of the effect. Alternate uses for this jack include providing an unbalanced line level signal for con- necting to an external amplifier or mixing console. The signal at this jack is affected by the Master control (#10).
20:LINE IN: Used with the Line Out jack (#19), this may serve as an effects loop: The signal from this jack would come from the output of the effect. Alternate uses for this jack include providing a means to tap directly into the internal power amplifier, bypassing the input stages com- pletely.
21.LINE OUT LEVEL: This controls the output level of the signal at the Balanced Line Out jack (#24).
22:POST/PRE SWITCH: This switch determines whether or not the signal at the Balanced Line Out jack (#24) is affected by the settings of the tone and master level controls. With the switch at the OUT (“Post”) pos- tion, signal is affected; with the switch IN (“Pre”), the sig- nal is not affected.
23:LIFT/GND SWITCH: This switch lifts the ground of the Balanced Line Out jack (#24) at the IN position. Engage this switch only if there is excessive buzzing or hum coming from the amplifier due to ground loops.
24:BALANCED LINE OUT: This jack provides a bal- anced line level signal for connecting to a mixing console, recording device or external amplifier.
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| POWER HANDLING: 150 WATTS |
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| IMPEDANCE: 8 OHMS |
| HIGH FREQUENCY |
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ATTENUATOR | FULL RANGE | ||
MADE IN THE U.S.A. BY | OFF – 6 | 0 | INPUTS |
SLM ELECTRONICS |
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1400 FERGUSON AVE. |
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ST. LOUIS, MO 63133 |
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2526 
25:HIGH FREQUENCY ATTENUATOR: This three position rotary switch controls the output level of the inter- nal high frequency driver. Use the tip of a flatblade screw- driver to set this switch to the setting which best suits your tastes.
26:FULL RANGE INPUTS: These are the input jacks for the cabinet. Connect one of these jacks to the Speaker ouput of the amplifier; the other jack may be used to carry the amp signal to an extension cabinet if desired.
