Telonics PA-4200 User manual

Telonics PA-4200/PA-200
Stereo Power Amplifier
Users Manual
Telonics Pro Audio
©2010 Telonics, Inc. All Rights Reserved
PB008674 Rev F 2011.07.21

Telonics PA-4200 Power Amplifier 2
PB008674 Rev F
The Telonics PA-4200
Stereo Power Amplifier
ongratulations on purchasing one of the world’s finest professional instrument power
amplifiers! The PA-4200 power amplifier is a state of the art audiophile quality unit designed
and built with the latest and best sounding technology, while being the most lightweight high-
powered amplifier available in a 1U (single) rack space configuration.
The PA-4200 Power amplifier gives you dramatically better control of your sound. The result is
transparent, smooth, clean sound with added sustain, tight bottom end and silky highs. It’s just
what you’ve been looking for!
Telonics PA-4200 Stereo Power Amp Features:
• ompact size. Only takes up 1U rack space.
• Light Weight, only 5.2 pounds.
• Digital Thermal Management System.
• Wide frequency response, 20 Hz to 20 kHz +/- 0.5 dB.
• Stereo Amp. Left and Right Level ontrols conveniently located on the front panel.
• LED light-bar for lighting up your rack in low light venues.
• Ultra low noise – studio quality.
• Auxiliary A power outlet for EFX units, switched with main power switch.
• Two 24 volt D jacks to power up Telonics 24 VD preamp and Telonics FP-100 foot
pedal. (No power strip required in 3U rack applications.)
• Special Power On/Off circuit to minimize “pops” and speaker damage.
• Durable construction throughout. Made for years of trouble free use.
• Proudly made in the U.S.A. by musicians and engineers.

Telonics PA-4200 Power Amplifier 3
PB008674 Rev F
PA-4200 S TERE P WER A MP C NTR L F UNCTI NS , J ACKS , & I NDICAT RS :
F R NT P ANEL
A Power Switch
This is the main power switch for the system. This switch also controls the
A receptacle on the rear panel, the 24 VD output for the Telonics preamps
(rear panel), and the 24 VD output for FP-100 Foot Pedal (front panel).
Eliminates the need for a power strip in 3U rack systems.
Blue LED The blue LED will indicate that the main power is turned on.
Standby Switch
This switch allows control of the A power to the power amp alone,
independent of the system power. When placed in the Standby mode it
allows for quicker cool down of the amplifier if needed. This switch must be
on in normal use as it effectively “mutes” the power amplifier section in the
off position.
Thermal
Management
Status
The Thermal Management Status indicates the temperature status of the
power amplifier. The LEDs indicate a low (green), medium (yellow), or
high (red) temperature range.
The LEDs will also indicate a fan speed out of specification condition as
described later, in the Thermal Management System; Fan Speed out of Spec
Indication paragraph.
Green LED
The green LED will blink; on for a short time then off, once a second while
the temperature is below the Low setting. This “wink” (short blink, once per
second) lets you know that the Thermal Management System is working. As
the temperature increases the green LED will come on solid while the
temperature is at or above the low setting.
Yellow LED The yellow LED will come on solid if the temperature is at or above the
medium set point.
Red LED The red LED will come on solid if the temperature is at or above the high set
point.
R Input Level This is an input attenuator for the right audio channel. Fully clockwise will
allow maximum output from the amplifier.
L Input Level This is an input attenuator for the left audio channel. Fully clockwise will
allow maximum output from the amplifier.
LED Light Only This 1/4” jack powers up the optional LED light bar. CAUTION: NO
AUDIO CABLES SHOULD BE PLUGGED INTO THIS JACK.
24VD Output
This jack provides an isolated 24 volts D to power up the FP-100 foot
pedal. This jack accepts a special twist lock plug for a secure connection of
power to the pedal.

Telonics PA-4200 Power Amplifier 4
PB008674 Rev F
PA-4200 S TERE P WER A MP C NTR L F UNCTI NS , J ACKS , & I NDICAT RS :
R EAR P ANEL
A Power Input
110-120VA input*. Standard IE 60320 13 receptacle on 18 AWG
cord is recommended. The inlet is fused with an 8 amp 250VA
5x20mm ceramic Slow Blow fuse.
24VD Out 24 volt D to power the Telonics preamplifier.
A Power Outlet Switched 110-120VA outlet, fused with 2 amp 250VA 5x20mm glass
Slow Blow fuse. Note: This outlet is not available in the export version.
Input L, R Dual ¼” mono tip sleeve (TS) jack for right and left input signals.
Output Left, Right Speakon combo jack for output to a minimum 4 ohms speaker load.
Also accepts ¼” TS plug.
*NOTE: Standard versions are wired for domestic use only. Export units are available on special
order. Export A Power Input range is 170-250 VA , 50-60 Hz with a 4A 250VA fuse.
CAUTION: Voltages outside t is range could damage t e unit and cause a s ock azard.
Standard IE 60320 13
receptacle is required for the
Power Amp side.
UK Plug BS1363A
(Supplied with 13A fuse).
Telonics # WI-008667-001
Europe IE 884/ EE7-VII
Telonics # WI-008669-001
Australia Plug AS 3112
Telonics # WI-008668-001

Telonics PA-4200 Power Amplifier 5
PB008674 Rev F
PA-4200 T HERMAL M ANAGEMENT S YSTEM
I NTR DUCTI N
The cooling system for the PA-4200 Audio Amplifier consists of four variable-speed fans and an
intelligent digital controller circuit. The speed of the fans is determined by the temperature at
multiple key points within the amplifier. The controller is designed to run the fans at the slowest
possible speed sufficient to maintain the amplifier at a safe operating temperature, and thus yield
the quietest possible operation. As the temperature of the amplifier increases, the fan speed is
increased as necessary.
T EMPERATURE I NDICATI N
The amplifier’s temperature is indicated on the front panel via the status LED’s:
Blue = Thermal Management System power is on
Green = Temperature is above the Low temperature threshold
Yellow = Temperature is above the Medium temperature threshold
Red = Temperature is above the High temperature threshold
The following table shows the state of the Green, Yellow and Red LED’s, and the fan speed for
the specified temperature ranges:
Notes:
‘Wink’ = short blink, once
per sec.
‘ON’ = on solid.
F AN S PEED UT F S PEC I NDICATI N
The speed of the fans is measured in order to make sure that the fans are operating properly and
to assure adequate cooling for the amplifier. If the speed of any of the fans is out of allowed
tolerance for five or more consecutive seconds, then the LEDs defined by the above table (i.e.,
Green and Yellow for temperature between Medium and High) will blink long flashes twice per
second; they will be on for ¼ second, and off for ¼ second. This is a flash that is easily
discernible from the ‘Wink’ condition described above. If the speed of all of the fans returns
back to within tolerance, the blinking will stop, and the LEDs will return to the state described in
the table above. Should this ‘Flashing’ persist, this could be indicative of a fan failure, and could
lead to the amplifier overheating. In this case, the amplifier should be returned to the factory for
repairs.
Temperature LED Status Fans
>= < Green Yellow Red No. Speed
Low Wink off off 2 Minimum
Low Medium ON off off 4 Increasing
Medium High ON ON off 4 Increasing
High ON ON ON 4 Maximum

Telonics PA-4200 Power Amplifier 6
PB008674 Rev F
PA-4200 T HERMAL M ANAGEMENT S YSTEM C NTINUED
F AN -W EAR B ALANCING
In order to further minimize the noise produced by the fans, and to prolong the life of the fans,
the four fans are divided into two pairs. Whenever the temperature of the amplifier is below the
Low temperature threshold, one of the pairs is turned off, and one pair continues to run at the
minimum speed. In most environments, when the amplifier is idle or played at lower levels, a
single set of fans is adequate to maintain a desirable temperature within the amplifier. Whenever
the amplifier temperature rises above the Low threshold, the second pair of fans is turned on
slowly in addition to the first pair; therefore, all four fans will be running, initially at the
minimum speed. Should the temperature of the amplifier continue to rise, the speed of all four
fans will be slowly increased accordingly; if the temperature of the amplifier drops, the speed of
all four fans is slowly reduced accordingly. If the temperature of the amplifier again drops
below the Low threshold, then the second pair of fans is turned back off. The pair of fans which
will ‘always be on’ will be alternated every time that the power is cycled. Thus, in the long run,
the wear on the fans will be balanced.

Telonics PA-4200 Power Amplifier 7
PB008674 Rev F
PA-4200 M ECHANICAL D ATA
Feature Specification
hassis Material Aluminum
Finish Hard Anodized
Front & Rear Panel Markings Laser Etched
Panel Meets industry standard specifications (EIA-310-D,
EA-310-E, IE 60297-3-100, and DIN 41494-7).
Panel Thickness 0.13 in. (0.33 cm)
Panel Height 1.70 in.(4.32 cm) typical
1.75 in. (4.45 cm) max
Panel Width 19.0 in. (48.3 cm) max
Internal chassis/cabinet width
(including screws) 17.32 in. (44 cm)
Internal chassis/cabinet height 1.73 in (4.39 cm) typical
1.75 in. (4.45 cm) max
Internal chassis/cabinet depth 7.63 in. (19.4 cm)
Total protrusion of jacks beyond
rear chassis apron (max) 0.425 in. (1.08 cm)
Total protrusion of knobs beyond
front panel 0.725 in. (1.842 cm) max
Total weight 5.20 lb. (2.358 kg)

Telonics PA-4200 Power Amplifier 8
PB008674 Rev F
PA-4200 E LECTRICAL S PECIFICATI NS
Parameter Condition Value
Mains input voltage 115Vac setting 85Vac to 132Vac
Mains input voltage 230Vac setting 170Vac to 250Vac
115Vac setting 8 amp 250VA 5x20mm
ceramic Slow Blow fuse.
Mains fuse
230Vac setting 4 amp 250VA 5x20mm
ceramic Slow Blow fuse.
Auxiliary switched A
power outlet
115Vac setting only 2 amp 250VA 5x20mm
glass Slow Blow fuse
Output power @ 1%THD+N R
L
= 4 Ohm
20Hz < f > 20kHz, both
channels driven
115Vac
190 W typical
Output power @
10%THD+N
R
L
= 4 Ohm
20Hz < f > 20kHz, both
channels driven
115Vac
240 W typical