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Transfer function

Posted by Mark Kelly (M) on December 2, 2005 at 20:39:25

In Reply to: Wrong! posted by garth on December 2, 2005 at 18:19:18:

You are right in what you say but it is worth noting that 47 labs have done themselves and others a disservice by talking about the voltage gain of their phonostage. This is a meaningless specification. Because it uses current input and voltage output the correct specification is the transfer function in volts per amp (and therefore numerically equal to a resistance in ohms). In this case we would use volts per milliamp or millivolts per microamp.

I believe the 47 labs units have transfer functions of somewhere about 10 volts per milliamp on the lower setting and about 60 volts per milliamp on the higher setting. All you then need to know is the current output of the cartridge in use (divide the output voltage by the coil resistance, so for the 47 labs Miyabe the output is 150 microamps). This multipled by the transfer function gives the output (around 1.5 volts for the Miyabe).

Mark Kelly

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