DR. Z Amplification MAZ 18 Junior User manual

MAZ 18 Junior/MAZ 38 Senior
Owners Manual

Intro:
Thank you for purchasing a Dr Z Amp. This amplifier was designed to give you years of playing
and sonic enjoyment. We are proud to forge ahead and create new tube amplifier sounds with
a nod to the classics of the past. Whether you are a touring professional, weekend warrior, or
basement jammer; we take your sound and need for a reliable amplifier seriously.
Overview:
The Maz 18/Maz 38 series of amplifiers are designed to give you a portable and familiar pack-
age. These amps offer the classic platform of a 12AX7 front end coupled with an EL84 power
section, tube reverb, and tube rectification. You’ll find this series has an unmistakable blend of
classic American and English tones. They can deliver full bodied clean tones and natural over-
drive all while letting you dial in the “Chime.” The Maz 18 is great for getting classic breaking
up tube tone at lower volumes. The Maz 38 gives you more clean headroom and low end push.
Both give you great flexibility to shape your guitar sound.
Front Panel:
Input Jacks: Input 1 (HI) is for normal use. Input 2 (LO) has 3db less gain. Use with humbucker
equipped guitars if you’d like cleaner sounds.
Volume: Controls overall gain. Set over halfway for overdriven sounds. Set below halfway for
cleaner sounds.
Treble: Controls overall high frequency response.
Middle: Controls overall mid frequency response.
Bass: Controls overall low frequency response.
Master: Controls overall amp volume and output tube compression.
Cut: Controls overall tone/presence of amp. Turn clockwise for chime.
Reverb: Turn clockwise to add reverb.
Standby: Leave in off position for 1 minute when powering up the amp. Turn on for play. Place
in off position for extended break periods.
Power: Turns amp On or Off.

Rear Panel:
Fuses: 2 amp (Maz 18) or 3 amp (Maz 38) for AC voltage. ½ amp fuse for DC
Voltage.
Speaker Jacks: Plug speaker into specific jack for it’s rating (8ohm speaker
into 8ohm jack.)
Effects Loop: (optional) Plug “In” to Send and “Out” to Return. Good for Delay
or Reverb effects. Run all others (overdrive, wah, etc…) through the front.
Care and Feeding:
While we hope you get years of worry free use out of your Dr Z Amp there are
some basic maintenance procedures to follow.
Changing Output Tubes: If your amp starts sounding a bit dull or lacks punch
it’s usually time for a new set of output tubes. Changing the EL84 output tubes
on your Maz 18/38 is easy. These amps are cathode biased so there is no
need to rebias when changing tubes. Always use a matched pair (Maz 18) or
matched quad (Maz 38) of EL84’s. We use Groove Tubes EL84S as our stan-
dard EL84. Always make sure the power is off and AC cord is unplugged
when changing tubes. Always use caution not to burn your fingers as tubes be-
come very hot quickly. With moderate usage output tubes should last 6 months
to a year.
Changing Pre Amp Tubes: When pre amp tubes fail it usually results in a static
type noise or a ringing microphonic type sound. Pre amp tubes are easily re-
placed. We recommend replacing them with the same brand/type that came in
the amp. We have hand selected these tubes to deliver optimal voicing.
Changing Rectifier Tube: Signs your rectifier tube (5AR4/GZ34) needs
changed are fairly obvious. A bad rectifier will usually result in a fuse blowing.
Power off, unplug the AC cord and replace the blown fuse before replacing the
rectifier tube. Use caution as these tubes get very hot!

General Maintenance:
• If you experience intermittent crackle/static type sounds make sure the
4 screws that secure the chassis are tight. If a bit loose, the chassis will
lose connection to the RF shield.
• Make sure a speaker is connected to your amplifier before you turn it on.
Always match your speaker or cabinet to the proper ohm rating on the
rear of the amp (8 ohm speaker or cab into the 8 ohm jack.)
• If amplifier powers on, but no sound is heard after switching off Standby
check your ½ amp fuse on the rear panel ( for related troubleshooting
see changing rectifier tube above.) If problem persists contact your
dealer or Dr Z Amps.
• Do not set liquids on top of your amplifier.
• Becuase tubes are made of glass be sure to allow you amplifier time to
acclimate to drastic changes in temperature before powering on.
www.drzamps.com

V1 V2 V3 V4 V5 V6
V8
ECC83 ECC83 12AT7 12AX7 12AX7 EL84 EL84
5AR4
MAZ 18
©Copyright 2004 Dr. Z Amplification www.drzamps.com
V7
V1 V2 V3 V4 V5 V6/V7
V8
ECC83 ECC83 12AT7 12AX7 12AX7 (2) EL84 (2) EL84
5AR4
MAZ 38
©Copyright 2004 Dr. Z Amplification www.drzamps.com
V7/V8