DR. Z Amplification DB4 ZA-40 User manual

DB4
Manual
Model: ZA-40
www.drzamps.com

Important Safety Instrucons
1) Read these instrucons.
2) Keep these instrucons.
3) Heed all warnings.
4) Follow all instrucons.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any venlaon openings. Maintain at least 3 feet of distance around all sides of amplifier.
Do not block any venlaon openings with items such as newspapers, tablecloths, curtains, etc.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug
has two blades with one wider than the other. A grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong are provided for your safety. If the provided
plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or pinched parcularly at plugs, convenience
receptacles, and the point where they exit from the apparatus.
11) Only use aachments/accessories specified by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold
with the apparatus. When a cart is used, use cauon when moving the cart/apparatus
combinaon to avoid injury from p-over.
13) Unplug this apparatus during lightning storms or when unused for long periods of me.
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus
has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.
15) Avoid placing any liquids on or near the amplifier that may splash or drip such as those contained in
boles, cans, glasses, etc.
*Dr Z amplifiers are capable of producing very high sound pressure levels which can cause temporary or
permanent hearing damage.
*If any screw that is actually on the amp chassis needs to be replaced contact Dr Z Amps for the proper size.
Screw size is crical for inner chassis clearances.
This symbol warns the user of dangerous voltage levels localized within the enclosure.
This symbol advises the user to read all accompanying literature for safely operang
the unit

Power Output 18/38 was
Output Tubes 4 - EL84
Preamp Tubes 2 - 12AX7
Recfier 5AR4
Controls Volume, Rotatory Tone Switch, Cut
Other 4, 8, 16 Ohm speaker outs
Half/Full power switch
Removable casters (2x12 combo only)
Configuraons Head
1x12 “Classi-Lite” combo
2x12 “Bluesbreaker” Combo
Colors Head and 1x2 Combo: Black, Blonde, Red
2x12 “Bluesbreaker” Combo: Black, Red, Navy Blue
Dimension & Weight Head: 19”W x 9 ¾H x 9 ½D 26 lbs.
1x12 “Classic-Lite” Combo: 23”W x 20 1/8”H x 10”D 42 lbs.
2x12 “Bluesbreaker” Combo: 32 1/4”W x 23 1/8”H x 10 1/2”D 68 lbs.
The DB4 is the fourth collaboraon between Dr. Z and Brad Paisley (hence the name DB4: Doc & Brad’s
fourth amp design). Brad asked for a rich and warm sounding Brish-voiced amp. I started with a clean sheet
of paper.
The input of the amp uses a 5879 U.S. made pentode preamp tube. This was the tube selected by Les Paul to
be used in his Gibson GA-40 Les Paul amp. The full-bodied silky tones of the 5879 are then driven into a
rotatory frequency filter. This control selects between jangly brilliance to deep and full resonant tones and
everything in between. To help fine adjust the hue of delivered frequency to the four EL84 output tubes is a
cut control. Think of this as a tone control for your output tubes.
This original amp design has its own voice, one that doesn’t sound like any EL84 amp you have ever heard. It
will be offered as a head, 1x12 “Classic-Lite” combo loaded with a Celeson Alnico Gold, and 2x12 “Blues-
breaker” combo loaded with two Celeson Alnico Blue speakers.
General Informaon
Specificaons

1. Input: Input jack for your guitar. Hi is for normal use. LO has 3 dB less gain. Use LO with Humbucker
equipped guitars for a cleaner sound.
2. Volume: Controls overall gain. Set over halfway for overdriven sounds. Set below halfway for cleaner
sounds.
3. Tone: Rotatory tone switch. Controls full range EQ for the amp.
4. Cut: Controls overall tone/presence of the amp. Turn clockwise for chime.
5. Stand-By: Leave in off posion for 1 minute when powering up the amp. Turn on for play. Place in off
posion for extended break periods.
6. Power: Switch up to turn on amplifier. Switch down to turn off amplifier.
7. Power Indicator: Lights up when power is switched on. If bulb fails replace with type T47.
FRONT PANEL
REAR PANEL
12 13119
8. AC Inlet: (Class I Wiring). This device is used for disconnecon from power mains and must remain
readily opearable. The power indicator light does not indicate connecon to power mains. The power
cord must be disconnected to disconnect amplifier from power mains.
9. Fuse: The fuse protects the amp from electrical faults. Replace only with the same rang and type
stated below fuse holder. If the amp repeatedly blows the fuse contact your dealer or Dr Z Amps.
10. Half/Full Power Switch: This switch allows you to play your amp at half (18 was) or full (38 was)
power.
11. 16 OHM Speaker Jack: Plug in 16 ohm speaker here. Always have a speaker plugged into the amp
when it is powered on. Always match the speaker impedance to the proper speaker out jack. This will
allow the amp to sound its best and avoid damage.
12. 8 OHM Speaker Jack: Plug in 8 ohm speaker here. Always have a speaker plugged into the amp
when it is powered on. Always match the speaker impedance to the proper speaker out jack. This will
allow the amp to sound its best and avoid damage.
13. 4 OHM Speaker Jack: Plug in 4 ohm speaker here. Always have a speaker plugged into the amp
when it is powered on. Always match the speaker impedance to the proper speaker out jack. This will
allow the amp to sound its best and avoid damage.
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MADE IN USA
MODEL: ___________________
SERIAL NUMBER: ___________
INPUT VOLTAGE: ____________