The Signal Transfer Company

The Signal Transfer Phono Preamplifier.

Unbalanced output version.

RIAA phono preamp; unbalanced output
The Signal Transfer Stereo Phono Preamplifier is a stand-alone version of the phono sysytem 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.
  • PCB 006: 28.00 each
  • Kit 006: 152:00 each
  • Built and tested: 219:50 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
3
330_002
3.75
Phono socket, white
3
330_003
3.75
4-pin XLR male PCB connector
1
304_112
3.25
4-pin XLR female cable connector
1
304_121
7.50

.

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

RIAA EQUALISATION ACCURACY

This graph shows the typical RIAA equalisation accuracy. The error is less than 0.1 dB from 100 Hz to 40 kHz.

The response is affected by the subsonic filter below 100 Hz, but is still accurate to -0.5 dB at 50 Hz.
note that the scale is enormously expanded. Measurement system Audio Precision SYS-2702.