![background image](http://html1.mh-extra.com/html/zeck-audio/pt-series/pt-series_owners-manual_3295799011.webp)
Zeck PT series
stereo power amplifiers
1. Introduction
1.1 General notes
The term 'PT' stands for Power Transfer, which expresses
exactly what the PT series power amplifiers do: they 'transfer'
a few milliwatts of electrical signal power at the inputs into a
couple of hundred watts at the speaker outputs, without chang-
ing the shape of the signal and adding as little noise or other
spurious signals as possible. We put this signal transfer under
the command of one of the most technical advanced control
systems, including NLR (Non-Linearity Restoration) and TCL
(Temperature Control by Limiting).
1.2 Features of the PT series amplifiers
All PT series power amplifiers are equipped with:
• High efficiency ´flow through´cooling system with
2 proportional temperature controlled fans and large surface
hybrid heatsink.
• LED displays for ready/protect, signal, NLR (distortion limiter)
and TCL (temperature controlled limiter)
• electronically balanced mixed XLR/phone jack input
sockets with parallel XLR outputs for easy setup of
multiple-amplifier systems
• oversized, non-compromise power supply with low-flux
toroidal transformer
• 3 Speakon output connectors for stereo, parallel and bridge
mode
• soft-start anti-surge circuitry for maximum speaker protection
• high-efficiency output stage for lowest possible internal power
dissipation
• protection circuitry against clipping, overtemperature,
mismatched loads, open/short outputs and dc voltage
at output
• distortion-controlled input stage with ultra-fast 100V/µs
internal-loop slew rate
1.3 The PT series models
The PT series amplifiers are available in 4 models:
Model
rated output power per channel
into 4 ohms
into 8 ohms
PT 3
330 W
220 W
PT 5
540 W
330 W
PT 7
720 W
450 W
PT 9
920 W
600 W
owner's manual PT series
11
owner`s manual PT series © 1995 Zeck Audio
R
BRIDGED MONO OPERATION: INPUT SELECTOR SWITCH TO BRIDGED
POSITION. INPUT SIGNAL TO CH. 1 ONLY. CONNECT SPKR TO 1+ AND 1- OF
BRIDGED OUT CONECTOR. MATCH CH. 1 AND CH. 2 GAINS ON THE FRONT
PANEL AND REGULATE LEVEL WITH BOTH GAIN CONTROLS SIMULTANEOUSLY.
DUAL
BRIDGED
PARALLEL
INPUT
DIRECT
OUT
MIN.
2 OHM
BRIDGED
HAZARDOUS ENERGY!
MAKE PROPER SPEAKER CONNECTIONS.
SEE OPERATING MANUAL.
SPEAKER OUT
MIN. 4 OHM
MODE
1
2
1
2
PT SERIES
1 = SIGNAL GROUND
2 =
3 = SIGNAL -
1 + = SIGNAL CH. 1
1 - = GROUND CH. 1
2 + = SIGNAL CH. 2
2 - = GROUND CH. 2
1 + = SIGNAL CH.2
1 - = GROUND CH. 2
1 + = SIGNAL CH.1
1 - = SIGNAL CH.2
2 + = GROUND CH.1
2 - = GROUND CH.2
THIS APPARATUS MUST BE EARTHED. TO REDUCE THE
RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE
THIS APLLIANCE TO RAIN OR MOISTURE.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL.
RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR.
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
!
RISK OF ELECTRIC SHOCK
DO NOT OPEN
3
1
2
CAUTION
SERIAL
Nr.: 941001AA018
MADE IN BELGIUM