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General| Series | Portaflex |
|---|---|
| Type | Bass Amplifier |
| Power Output | Varies by model (e.g., 350W, 500W, 800W) |
| Speaker Configuration | Varies by model (e.g., 1x15", 2x10", 4x10") |
| Tube Preamp | Yes (on some models) |
| Solid State Power Amp | Yes (on some models) |
| EQ | Varies by model. Typically 3-band EQ (Bass, Mid, Treble). Some models have additional EQ controls. |
| Inputs | 1 x Instrument |
| Outputs | Varies by model |
| Impedance | Varies by model (e.g., 4 ohms, 8 ohms) |
| Weight | Varies by model (e.g., 35 lbs, 65 lbs) |
| Dimensions | Varies by model |
| Tone Controls | Bass, Mid, Treble |
Connects instruments to the amplifier via 1/4" shielded cables.
Connects active instruments to the amplifier to reduce signal level.
Adjusts the input signal level reaching the preamp for optimal tone.
Emphasizes low frequencies by +2 dB at 50 Hz and -10 dB at 500Hz.
Enhances high frequency output by +5 dB at 8 kHz.
Adjusts low frequency level; flat at center position.
Adjusts midrange frequency level; flat at center position.
Selects center frequency for the Midrange control (1-5).
Adjusts high frequency level; flat at center position.
Controls overall output level for speaker and preamp outputs.
Controls for turning the amplifier on/off and engaging standby mode.
Protects against overloads; connects the AC power cord.
Allows user to bias power amp using LEDs and a control.
Selects preamp output signal as Pre-EQ or Post-EQ.
Balanced line out for external gear, with ground lift option.
Balanced line out for external gear, with ground lift option.
Matches amplifier output impedance to speaker(s) (4 or 8 Ω).
1/4" TS output for speaker cabinets; rated for 20W/50W.
Recommended control settings for a Jazz bass tone.
Recommended control settings for a Funk bass tone.
Recommended control settings for a Rock bass tone.
Recommended control settings for a high-gain/intense tone.
Visual examples of various control knob settings for different sounds.
Step-by-step instructions for safely removing and installing power tubes.
Procedure for removing and installing preamp tubes.
Interpreting bias LEDs to diagnose potential tube or bias control issues.
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