Thanks PD and Paul
Using the S boards (Asaka) and now K boards (Troika) in my pre-amp, I have not had any problems with noise, hence my original question.
PD amuse away, I am really looking forward to the alternative low noise front end (will try both options). Thanks for a great design and some wonderful threads full of patient explanations, this is all very interesting indeed - thank you for sharing your knowledge with us!
Kind Regards
Peter
Amazing how the specs and measurements vary from one source to another. I have copied the published specifications from the Linn Arm & Cartridge Service Manual (April 2002) below.
CARTRIDGE SPECIFICATIONS
Moving Coil: Troika, Karma, Asaka
Frequency response: 20 Hz to 20 KHz +/- 1 dB
Separation at 1 kHz: 30dB, 30dB, 27dB
Tracking weight range*: 1.5-1.7g, 1.5-1.7g. 1.5-1.7g
Channel balance @ 1 kHz: within 1 dB
Recommended load: greater than 10 ohms; Nominal 470 ohms
Capacitance loading: not critical
Stylus type: Vital, Vital, Vital
Tracking angle (deg): 20, 20, 20
Weight (grams): 7, 7, 7
Compliance (cu): 10, 10, 10
Output voltage: 100uV, 100uV, 100uV
* Tracking is normally set to 1.6 - 1.7 for moving coil cartridges and
1.7 - 1.8 for moving magnet cartridges. Exact tracking weight should
be set by listening at normal room temperature.