Barcus-Berry model: 1520 Vintage Electric Guitar Mixer/Head/Amplifier (with spring reverb), 1976-1977, made in USA

Link: worldradiohistory [catalogue, PDF]

The Model: 1520 that was made in 1976. The model: 1510 is the same minus the phase shifter. These are for guitar, not bass.

Front Panel / Face Control:
Input:
- Sensitivity
- Volume
Expander:
- Treble
- Bass
Tone:
- Treble
- Bass
Midrange:
- Level
- Frequency
Reverb:
- Volume
- Decay
Master:
- Hi-Z Level
- Lo-Z Level
Phase: (The model: 1510 is the same minus the phase shifter)
- switch on/off
- Speed
- Depth
Power:
- switch Power on/off
- led indicator (red)


Rear Panel:
Monitor:
- 8 Ohm ¼" monitor out
Output:
- Lo-Z XLR out
- ¼" record out
- ¼" Hi-Z out
Foot SW:
- Reverb ¼"
- Accessory ¼"
- Phase ¼"
Echo:
- Send ¼"
- Receive ¼"
Accessory:
- Send ¼"
- Volume control
- Receive ¼"
Tape:
- Volume control
- ¼" Tape Receive
Mixer:
- ¼" Input

All of those features are packed into this compact, lightweight unit that puts out 30 watts RMS of power.