
STICK-ON® SERIES
Model ST-PH1
Phono Preamplifier
ANYWHERE YOU NEED...
•
Stereo or Mono Phono Preamplifier
•
Preamplifier with Balanced or Unbalanced
Outputs
•
Preamplifier with Hi or Low-Impedance
Outputs
•
Accurate, Low-Noise Preamplification
•
Ground-Referenced or Floating Power
•
RDL SupplyFlex™ Power Input Configuration
You Need The ST-PH1!
The ST-PH1 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable
bottom adhesives provided permit permanent or detachable mounting nearly anywhere or it may be used
with RDL’s STR-19A or STR-19B racking adapter for rack mounting! The ST-PH1 gives you the
advantages of a high quality, low-noise phono preamplifier with a big plus, you can put it where you need it!
The ST-PH1 is a stereophonic phono preamplifier. Each of the channel circuits is identical. The ST-PH1
has standard 47 kΩ impedance unbalanced phono cartridge inputs. Each output will drive a high or
low-impedance balanced or unbalanced line. Equalization follows the RIAA curve.
The power supply input may be fed from a floating (not ground-referenced) 24 Vdc power source, from a
bipolar power supply (+/-12 Vdc or +/-15 Vdc), or from a ground-referenced 24 Vdc power supply. A switch
on the module is used to select the power configuration.
The ST-PH1 features superior circuitry for low-noise, low-distortion, and exceptional audio clarity. Some
features are:
• Input matched to standard cartridges used in the industry.
• Impeccable audio quality.
• Ultra-low distortion and low noise.
• Output levels adjustable (Independent adjustment for left and right channels).
• Ample headroom at operating level.
• Outputs short circuit protected.
• Operation from floating, bipolar, or ground-referenced dc power supply.
• Positive connections via barrier block, no audio connectors to wire.
Optimum system performance is obtained when phonographs are preamplified as close to the turntable as
possible, and then the line-level signals are fed to the next piece of equipment in the chain. Audio
performance and mounting convenience make the ST-PH1 ideal for a wide range of turntable installations!
RDL • P.O. Box 1286 • Carpinteria, CA., USA 93014 • (805) 684-5415 • FAX (805) 684-9316 • http://www.rdlnet.com

STICK-ON® SERIES
Model ST-PH1
Stereo Phono Preamplifier
AUDIO
WIRING
TURNTABLE WITH
STANDARD MOVING
MAGNET CARTRIDGE
RDL ACB-2
(OPTIONAL)
Installation/Operation
EN55103-1 E1-E5; EN55103-2 E1-E4
Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.
PROFESSIONAL PHONO PREAMP
GAIN L
INPUTS
L
+
POWER
R
U
OUTPUTS
L
SIGNALS
FEEDING
UNBALANCED
LINE-LEVEL
EQUIPMENT
R
GAIN R
FLGR
+
PROFESSIONAL PHONO PREAMP
GAIN L
INPUTS
L
+
RDL PS-24
TYPE
SUPPLY
ANY GROUND TERMINAL CAN BE USED FOR A BIPOLAR
POWER SUPPLY. SET POWER SUPPLY SWITCH TO
FLOATING IF USING A BIPOLAR POWER SUPPLY
POWER
R
U
24 VDC
POWER
SOURCE
OUTPUTS
L
GROUNDED FLOATING
GROUND-REFERENCED
OR FLOATING POWER
SUPPLY OPERATION
(LOCATED BEHIND POT)
GR FL
GAIN R
R
FLGR
SWITCH SELECT
GAIN L
+
+
ADJUST
LEVELS
PROFESSIONAL PHONO PREAMP
INPUTS
L
POWER
R
U
OUTPUTS
SIGNALS
FEEDING
R
L
BALANCED
LINE-LEVEL
EQUIPMENT
FLGR
GAIN R
TYPICAL PERFORMANCE
Inputs: 47 kΩ unbalanced
Gain: 40 to 60 dB @ 1 kHz (adjustable)
Output: 300 Ω to drive low or high-impedance balanced or unbalanced lines
Output Signal: Balanced: +4 dBu nominal (adjustable)
Unbalanced: 6 dB below balanced line-level
THD: < 0.03% Hi-Z load; < 0.015% 600 Ω load. (10 Hz to 30 kHz)
Frequency Response: RIAA curve
Noise: < -75 dB below +4 dBu
Headroom: 18 dB above +4 dBu
Power Requirement: 24 to 33 Vdc @ 60 mA, Ground-referenced or Floating
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
891-0019J
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
+