DR. Z Amplification MAZ 18 User manual

MAZ 18/MAZ 38 NR
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 18NR/Maz 38NR series of amplifiers was designed to give you the clas-
sic platform of a 12AX7 front end coupled with an EL84 power section and tube
rectification. You’ll find this series has an unmistakable English accent. It can
sparkle or grind while letting you dial in the “Chime.” The Maz 18 NR is great for
getting classic breaking up tube tone at lower volumes. The Maz 38 NR 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 be-
low 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.
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: ½ Amp fuse for DC Voltage section
2 Amp (18NR) or 3 Amp (38NR) AC fuse.
Speaker Jacks: Plug speaker into specific jack for it’s rating (8ohm speaker
into 8ohm jack.)
Effects Loop: 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 NR is easy. These amps are cathode (self) 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
standard 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

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ECC83 ECC83 12AX7 EL84 EL84
5AR4
MAZ 18 NR
© Copyright 2004 Dr. Z Amplification www.drzamps.com
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ECC83 ECC83 12AX7 EL84 EL84 EL84 EL84
5AR4
MAZ 38 NR
©Copyright 2004 Dr. Z Amplification www.drzamps.com
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