Ampeg Analog Bass Preamp Owner`s Manual

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Page 1

Owner’s Manual

Page 2

Classic Analog Bass Preamp

TABLE OF CONTENTS

What’s in the Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Top Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Rear and Bottom Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Bottom Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Suggested Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Technical Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Warranty and Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

What’s in the Box

Classic Analog Bass Preamp Pedal, Quick Start Guide.

Introduction

The Ampeg Classic Analog Bass Preamp pedal is like having a choice of Ampeg amps right on your pedal board. Dial in a wide range of authentic Ampeg tones with the 3-band

tone stack and highly exible Ultra-Hi and Ultra-Lo circuits. It’s the most aordable way

into the pure analog bass tone of Ampeg.

Like all Ampeg products, your Classic Analog Bass Preamp pedal is designed by musicians and built using only the best of components. Each pedal is tested to conrm that it meets our specications, and we believe that this pedal is the absolute best that it

can be.

In order to get the most out of your new pedal, please fully read this Owner’s Manual, as well as the Important Safety Instructions included with your pedal, before you begin playing. Best of luck in all of your musical endeavors!

And thank you for choosing Ampeg.

Features

• Delivers a wide range of authentic Ampeg tones

• Classic 3-band tone stack, plus volume

• Ultra-Hi and Ultra-Lo circuits for tonal exibility

• True bypass, analog design with incredible signal-to-noise ratio

• Roadworthy, all-metal chassis construction

• 9V DC supply or battery capable (not included)

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Top Panel Features

110

1. INPUT: The signal output from an

instrument (active or passive) may be

connected to this 1/4" Input by means

of an unbalanced, shielded instrument cable.

NOTE: There is a –15 dB Pad Jumper located inside of the pedal. Details on switching the jumper may be found on page 5.

NOTE: Unplug the input cable when not

in use, as the 9V battery will drain (and eventually die). Details on replacing the battery may be found on page 5.

2. CLASSIC PREAMP SWITCH: Engage this switch to activate the Classic Preamp pedal. This pedal is true bypass, meaning the signal will pass through from input to output, with no circuitry in between, when the switch is disengaged.

3. ON/OFF LED: This LED illuminates

purple when the pedal is engaged.

4. VOLUME: Use this to control the overall output level. Use it wisely and turn it

down when making connections or

trying something new. Unity is at 12:00.

NOTE: The Volume control is active only when the pedal is engaged.

Classic Analog Bass Preamp

5. BASS: Use this to adjust the low

frequency level. This provides up to 7

dB of boost, or 20 dB of cut, at 40 Hz. The low frequency output is at at the

center position.

6. ULTRA LO: This switch, when engaged, enhances the amount of low-

end output with a 2 dB boost at 40 Hz, and –10 dB cut at 500 Hz.

7. MID: Use this to adjust the midrange

frequency level. This provides up to 5

dB of boost, or 11 dB of cut, at 500 Hz. The midrange frequency output is at at

the center position. Rotate the control counter-clockwise

for a “contoured” sound, (more distant, less midrange output) or clockwise for a sound that really cuts through.

8. TREBLE: Use this to adjust the high frequency level. This provides up to 10 dB of boost, or 10 dB of cut, at 4 kHz. The high frequency output is at at the

center position.

9. ULTRA HI: This switch, when engaged, enhances the amount of high-end

output by 7 dB at 8 kHz.

10. OUTPUT: Typically, this 1/4" Output jack connects to the input of an

external power amplier – or powered

loudspeakers, as long as they have their own input controls to adjust the volume level – by means of an unbalanced, shielded, instrument cable.

However, it may alternatively be connected to an external mixer, recorder, or interface. In this way, you

do not have to mic the speaker cabinet

in order to add it to the main mix or

to record. The level of the signal is

aected by the Volume control when

pedal is engaged.

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Rear and Bottom Panel Features

11. POWER CONNECTOR: This is where

to connect the optional power supply.

NOTE: Before plugging in the

power supply, make sure that you are using the correct model power supply for this product. Failure to do so may result in damage to your unit and void your warranty.

A DC-1G Power Supply may be purchased from an Ampeg Dealer, or you may purchase one directly from the Ampeg Online Shop, at shop.ampeg.com.

For residents outside of the US, please

request the model DC-1G Power Supply when purchasing from an

Ampeg dealer or distributor in your region.

Classic Analog Bass Preamp

BOTTOM PANEL ACCESS

Removing the bottom is easy. Simply start by placing the pedal top down on a soft, dry cloth.

Remove each of the four screws by turning them counter-clockwise. Be sure to keep them in a safe place as you will need them again!

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Bottom Panel Features

12. 9V BATTERY: The Classic Analog Bass

Preamp may be powered by 9V battery instead of using a power supply. As seen in the illustration above, a battery

ts nicely inside a compartment of the circuit board, next to the edge of the

pedal.

NOTE: Unplug the input cable when not

in use, as the 9V battery will drain (and eventually die).

13. –15 dB PAD JUMPER: Moving the –15 dB Pad Jumper reduces the input signal by 15 dB. This attenuation is suited for use with basses that have active electronics or high-output pickups.

There are only two possibilities. The

jumper can be on:

• Pins 1-2 (Normal – default)

• Pins 2-3 (-15 dB Pad)

Ok, ok...there could be no jumper, but that just sets the pedal to its Normal/ default, Pins 1-2 setting (with about 1/2 dB loss).

Referencing the above diagram, slide the jumper out then back in on the pins that you want to use for your instrument. Fingers should work

just ne, but it’s ok to use needle-

nose pliers to remove the jumper, if necessary.

–15dB

NORMAL

PIN1>>

Classic Analog Bass Preamp

NOTE: If you are experiencing excessive distortion (distortion begins at approximately 0.5V RMS) then you might want to utilize the -15 dB Pad by

moving the jumper to Pins 2-3. NOTE: When reattaching the bottom

plate to the pedal, line up the rectangular foam piece over the battery.

Turn the screws clockwise to ax to the

bottom to the pedal.

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Suggested Settings

Set Volume control to taste

= Switch engaged (down)

= Switch disengaged (up)

Slappin’ Da Bass Rock

Classic Analog Bass Preamp

Reggae

Classic Dino

Motown

Pick/Grind

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Block Diagram

Classic Analog Bass Preamp

OUTPUT

BASS TREBLE

CIRCUITRY

TONE CONTROL

INPUT

MIDRANGE

VOLUME

15 dB PAD

[INTERNAL]

ULTRA

TRUE BYPASS

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Classic Analog Bass Preamp

Technical Specications

Signal to Noise Ratio 75 dB

(50 Hz @ 300mV RMS)

Maximum Gain +18 dB

Tone Controls Bass: +7/–20 dB @ 40 Hz Mid: +5/–11 dB @ 500 Hz Treble: +10/–10 dB @ 4 kHz Ultra Hi: +7 dB @ 8 kHz Ultra Lo: +2 dB @ 40 Hz / –10 dB @ 500 Hz

Impedances Input: 1 M @ Normal, 83 k w/–15 dB Pad Output: 120

Power Requirements Internal: 9V Battery External: 9VDC, ≥20 mA, center negative

Size (H x W x D) 2.2 in x 2.6 in x 4.5 in 56 mm x 66 mm x 114 mm

Weight 0.6 lb / 0.3 kg (approximately)

The Classic Analog Bass Preamp is housed in a corrosion resistant, die-cast zinc chassis, so be sure to clean it with a dry, lint-free cloth. Never spray cleaning agents on the Classic Analog Bass Preamp. Avoid abrasive cleansers which would damage the ﬁnish.

Ampeg continually develops new products and improves upon existing ones. For this reason, the speciﬁcations and information in this manual are subject to change without notice.

Warranty and Support

Visit WWW.AMPEG.COM to...

(1) ...identify WARRANTY coverage provided in your local market. Please keep your sales receipt in a safe place.

(2) ...REGISTER your product.

(3) ...CONTACT Technical Support, or call 818-575-3600.

www.ampeg.com

26580 Agoura Road, Calabasas, CA 91302-1921 USA

Yamaha Guitar Group, Inc.

Rev. A