Phono preamplifier module with very accurate RIAA equalization(+/- 0.05dB)
Adapts to nearly all moving coil (MC) and moving magnet (MM) cartridges on the market through a wide range of gain, input resistance and input capacitance settings.
No step-up transformer required for MC cartridges.
Dual-mono design with option for two separate power supplies.
Balanced output option.
 

Example of internal view of assembled kit
Assembled kit CT100 with copper cover shielded
Rear view of assembled kit, with balanced BNC socket panel R/L

TECHNICAL DATA
Description
The CT100  is a two channel phono preamplifier with very accurate RIAA equalization and many features. It is realized with the best semiconductors available and non-inductive, low noise, SMD metal film resistors.

The circuit is designed to accept both moving coil (MC) and moving magnet (MM) transducers/cartridges directly in order to eliminate the need for an external MC step-up transformer or amplifier.
MC/MM input loading and input nominal level values are easy to select with high resolution by DIP-switches.

The CT100 is ideal for the most demanding applications requiring accurate RIAA equalization, very low noise, extremely low distortion and superior sonic performance.
CT100 is a pre-assembled PCB ready for building into an enclosure or even better into your turntable(shorter cables).
The high output voltage from CT100 makes it equivalent to other signal sources like CD-players.

Features
- Compact design. Dual-mono. Very low noise.
- Balanced output option.
- Non-inductive low noise SMD metal film resistors
- Input accepts moving coil/moving magnet(MC/MM) cartridges without step-up transformer
- Input loading 10Ω to 47Ω for MC/MM selectable in 21 steps
- Input nominal levels 0.1mV to 10mV selectable in 34 steps
- High output drive Balanced +/-28V, Unbalanced +/-14V
- High accuracy RIAA equalization with +/-0.05dB tolerance
- Additional time constants of 31.8uS and/or 7950uS are selectable
- Total harmonic distortion 0.0003%
- Low output impedance-drivers long signal cables
- High output current capability-drivers high impedance headphones
- Two-stage dual-supply voltage regulator on-board for each channel. Separate DC supply input for each channel(dual mono)

Typical Applications
- High performance RIAA preamplifier for MC and MM cartridges
- High performance RIAA headphone amplifier
- Upgrading Hi-Fi equipment
- Reference RIAA preamplifier
- Test equipment RIAA preamplifier

Specifications
Maximum ratings

Notes	Symbol	Parameter	Value	Unit
1	Vs	Supply voltage	± 50	V
1	Vin	Input voltage (Av = 40dB to 80 dB)	±1	V
1	Ts	Storage temperature range	-40 to + 85	°C

Notes: 1. Exposure to maximum rating conditions for extended periods of time may affect device reliability.

Operating Ratings

Notes	Symbol	Parameter	Value	Unit
2	Vs	Supply voltage range	±9 to ±35	V
2	TA	Ambient temperature range	-25 to + 70	°C

Notes: 2. Operating ratings indicate conditions for which other device parameter may not apply

DC Electrical characteristics
typical values at TA = +25 °C, Vs = +/- 20V and RL= 1KΩ unless otherwise specified

Notes	Symbol	Parameter	Value	Unit
	Rin	input resistance (DIP switch selectable)	10, 15, 18, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 150, 180, 200, 250, 400, 600, 1000, 47K	Ω
	Cin	Input capacitance (DIP switch selectable)	Approx. 100, 200, 300, 400	pF
3	IB	Input bias current  (Input bias current cancellation preadjusted)	Max. 0.5	uA
4	PSRR	Power supply rejection ratio (AV = 40 dB, 10 Hz to 20K Hz)	120	dB
	Ro	Output resistance (Vo = 1V, DC to 100K Hz)	0.1	Ω
	Vo	Output voltage swing (unbalanced)	Min. ±14.2	V
	Io	Output current (RL= 100 Ω)	±25	mA
	Is	Supply current (each channel)	±22	mA

AC Electrical characteristics
typical values at TA = +25 °C, Vs = +/- 20V and RL= 1KΩ unless otherwise specified

Notes	Symbol	Parameter	Value	Unit
	Vin	input nominal levels (Vo = 1V) ] (DIP switch selectable), (0.10mV ~AV = 80 dB), (1.0mV ~AV = 60 dB), (10.0mV ~AV = 40 dB),	0.10, 0.12, 0.15, 0.18, 0.20, 0.25, 0.30, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, 0.80, 0.90, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 7.0, 8.0, 9.0, 10.0	mV
	Vino	Input overload level (f= 1KHz, Av= 40 dB)	100	mV
	Av	Voltage gain (DIP-switch selectable)	40 to 80	dB
4,5	¡µAV	RIAA equalization deviation (Ref. = 1Khz, 10 Hz to 20KHz)	±0.05	dB
	Bw	Bandwidth (-3dB, Vo = 1V, Av= 40dB)	2	MHz
4	En	Input noise voltage density (Fo= 1k Hz, Av = 80 dB)	0.5	nV/±Hz
4,6	S/N	Signal to noise ratio (Av = 40/60/80 dB)	98/90/71	dB
4	CS	Channel separation (Av = 40dB, 10 Hz to 20kHz)	120	dB
4	THD	Total harmonic distortion (Av= 40 dB, Fo= 1KHz)	0.0003	%