Dr Z EMS
Our goal with the latest Dr. Z amp, the EMS, was to produce
the essential sounds of 3 generations of classic British amplifiers. Starting
with the mid-60s JTM 50 variant, we combine a dual EL-34 power section with a
tube rectified power supply, available by selecting "tube” via the rectifier
switch on the back panel. Along with the tube rectifier, setting the EMS’
sensitivity switch to "low” and "Touch” response switch to the down position,
this combination will produce the bloom and feel of the early American tweed
amps but with the British charm of EL-34 output tubes.
Flashing forward to the 70s, the essence of the "small box”
JMP amp is available in the EMS by selecting the "solid state” rectifier via
the back panel, selecting "low” sensitivity, and using the "Touch” switch to
match the amplifier with your choice of guitar. Using the same circuit
topography of the JTM series, only with a more powerful solid state power supply,
this sound is noted for its lightning quick response and cutting "kerrang” in
the upper midrange.
Lastly, the EMS incorporates the cascaded gain stage design
found in the 80s JCM series. By using the "high” sensitivity switch on the
front panel, and selecting solid state rectification, hard rock and classic
metal tones with tight bass response and singing gain will come screaming out
of your guitar. We massaged the circuit to remove some of the annoying,
persistent high-treble this era of amplifier has been maligned for and boosted
the gain a bit further so that more "modern” drive tones are available higher
on the gain knob.
The EMS, like all Dr. Z amplifiers, is 100% hand-wired in
Maple Heights, OH using select components throughout its stages and built on a
custom rolled aluminum chassis. It has a precise copy of the Drake 784-139
50-watt output transformer for authentic British crunch. For a perfect match to
the EMS small box head, we have our 2×12 cabinet loaded with a Celestion
Creamback 65M speaker and a Celestion G12 H30 70th Anniversary speaker wired in
series for 16 ohm. This cab is a great aesthetic match to the EMS head and is
covered with black tolex, black grill cloth, and gold piping. If ordered as a
set, the EMS and matching 2×12 will be offered at a special discounted price.
Power Output 50 Watts
Output Tubes 2 – EL34
Preamp Tubes 3 – 12AX7
5U4GB tube and solid state diodes
Volume, Treble, Middle, Bass, Presence
Other 4, 8, 16 Ohm
impedance via rotary switch
Hi/Lo sensitivity switch
"Touch” sensitivity switch
Tube/Solid State rectifier switch
*matching 2×12 cabinet with Celestion Creamback and H30
speakers available at special price when ordered together.
Colors Special "small
box” black cab with gold piping and logo
Dimensions & Weight Head*:
23 5/8″W, 9 5/8″H, 9 1/4″D, 30 lbs.
*matching 2×12 cabinet: 24” H, 24” W, 10” D, 53 lbs.