Abstract
Transformers (Trafos) are a very good substitute for MC cartridge pre-pre-amps (Fig. 1.1). Without big development efforts, they can be connected to a MM phono-amp’s input (Fig. 10.1). Unfortunately, and despite the many claims one can read from time to time in test magazines, transformers substantially add noise to the cartridge-transformer-phono-amp-chain.
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Notes
- 1.
If primary turns have been set as “1” and the secondary turns have been set as “n”, than the turns ratio tr = n.
- 2.
JT-347-AXT data sheet, by kind permission of Jensen Transformers, Inc., CA USA. To keep a clear overall view in this chapter I only refer to data of products from Jensen Transformers (JT).Of course, there are another handful of excellent transformer manufacturers, e.g. Lundahl (Sweden), Pikatron (Germany), Sowter (U.K.), etc.
- 3.
JT-44K-DX data sheet.
- 4.
Denon DL103 nominal values; see also Chap. 3 for more details; v0nom is calculated based on the data sheet value of 0.35 mV at 5 cm/s/1 kHz lateral modulated and transferred to 8 cm/s/1 kHz, flank modulated (=DIN 0 dB VR level).
- 5.
AS040, Jensen Transformers, Inc., Ca. USA.
- 6.
For details see also Sects. 4.2 and 4.5.
- 7.
Without any 1/f-noise effect taken into account.
- 8.
Without any 1/f-noise and excess noise from the lower valve’s anode resistor effect taken into account.
- 9.
Without any 1/f-noise effect taken into account.
- 10.
Jensen Transformers data sheet.
- 11.
stereoplay 04-2007.
- 12.
Jensen Transformers data sheet.
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© 2011 Springer-Verlag Berlin Heidelberg
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Vogel, B. (2011). Noise in Transformers. In: The Sound of Silence. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19774-1_10
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DOI: https://doi.org/10.1007/978-3-642-19774-1_10
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