The Signal Transfer Company

The Signal Transfer Phono Preamplifier.

Balanced output version.

RIAA phono preamp; balanced output
The Signal Transfer Stereo Phono Preamplifier is a stand-alone version of the phono system used in the Precision Preamplifier. It offers both moving-magnet and moving-coil inputs, the latter with two gain options for optimal performance. It gives extremely accurate RIAA equalisation, a noise performance that approaches the theoretical limits, and superb linearity. This version has balanced outputs and is designed to interface with equipment of the highest performance.

  • PCB 007: 32:00 each
  • Kit 007: 174:00 each
  • Built and tested: 249:00 each
  • Switches 4c/o 2.50 each

Some components used in this design are either difficult to find or not easily obtainable in small quantities; we can supply these. For this PCB, the parts we have identified are:

Part description:
Quantity
Stock code
Price
2SB737 low noise transistor
6
524_502
12.00
4-pole change-over switch
2
210_002
5.00
Phono socket, red
2
330_002
2.50
Phono socket, white
2
330_003
2.50
4-pin XLR male PCB connector
1
304_112
3.25
4-pin XLR female cable connector
1
304_121
7.50
3-pin XLR male PCB connector NC3MAH
2
304_106
4.60

.

4-pole c/o switches

F E A T U R E S.

S P E C I F I C A T I O N S.

This graph shows the typical RIAA equalisation accuracy. The error is less than 0.1 dB from 100 Hz to 40 kHz.
Please note that the scale is enormously expanded and covers only 1.5 dB.
The response rolls off very slowly below 100 Hz due to action of the subsonic filter, but is still accurate to -0.5 dB at 50 Hz.
Measurement system Audio Precision SYS-2702.