V-4B - Guitar amplifier AMPEG - Free user manual and instructions
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| Product Type | Guitar Amplifier Head |
| Brand | Ampeg |
| Model | V-4B |
| Power Output | 100 Watts RMS at 4 ohms |
| Amplifier Type | Vacuum Tube |
| Preamp Tubes | 4 x 12AX7 |
| Power Tubes | 4 x 6L6GC |
| Channels | 2 (Normal and Bright) |
| Equalization | Bass, Mid, Treble, Presence |
| Inputs | 2 x 1/4" Instrument |
| Outputs | 2 x 1/4" Speaker, 1 x XLR Line Out |
| Impedance | 4, 8, or 16 ohms selectable |
| Dimensions (H x W x D) | 10.5" x 22.5" x 10" (26.7 x 57.2 x 25.4 cm) |
| Weight | 38 lbs (17.2 kg) |
| Power Supply | 120V AC, 60Hz (US model) |
| Power Consumption | 250 VA |
| Fuse Rating | 4A Slow-Blow |
| Cooling | Fan-cooled |
| Construction | Steel chassis, Tolex covering |
| Maintenance | Periodic tube replacement, bias adjustment |
| Safety | Grounding pin, high voltage warning |
| Spare Parts | Tubes, fuses, knobs, feet available |
Frequently Asked Questions - V-4B AMPEG
What is the power output of the Ampeg V-4B?
The Ampeg V-4B delivers 100 watts RMS at 4 ohms, making it suitable for live performances and studio use.
What tubes does the V-4B use?
It uses 4x 12AX7 preamp tubes and 4x 6L6GC power tubes for a classic warm tone.
How do I bias the power tubes?
Biasing should be done by a qualified technician. The V-4B has a manual bias adjustment port on the rear panel.
What speaker impedance can I use?
The amplifier supports 4, 8, or 16 ohms via a selector switch. Match the total load to avoid damage.
Does the V-4B have a line out?
Yes, it has a balanced XLR line out for connecting to a PA system or recording interface.
Can I use the V-4B with bass guitar?
Although labeled as a guitar amplifier, the V-4B was originally designed for bass and works excellently with both.
How often should I replace the tubes?
Preamp tubes last 5000-10000 hours, power tubes 2000-5000 hours. Replace when sound degrades or becomes noisy.
How do I clean the amplifier?
Unplug the unit and use a dry cloth for the exterior. Avoid liquids. Periodically blow dust from the chassis with compressed air.
What safety precautions should I take?
Always use a grounded outlet. Do not operate with the cover off. Capacitors can hold lethal voltage even when unplugged.
Where can I find spare parts?
Spare parts like tubes, fuses, and knobs are available from Ampeg dealers or online retailers. Contact support for hard-to-find items.
User questions about V-4B AMPEG
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USER MANUAL V-4B AMPEG
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Product information
Brand : AMPEG
Model : V-4B
Category : Guitar amplifier