RE: Phono preamp and/or step up device

Posted by flood2 (A) on September 22, 2016 at 17:07:14

In Reply to: RE: Phono preamp and/or step up device posted by jeromelang on September 20, 2016 at 17:58:29:

If the OP is using a SUT, then the 47k will be reduced by the turns ratio of the transformer so the effective load resistance seen by the cartridge will be reduced by a factor of at least 100 (for a 1:10 ratio which would be a typical if not minimum value).

Due to the low coil inductance for an MC, load capacitance is a non-issue as the electrical bandwidth will be well above the tip resonance of the moving assembly. Capacitance of the order of 150pF to 300pF that you quoted is only an issue for MM cartridges due to the higher coil inductance and the need to match the electrical bandwidth with the mechanical resonance to achieve the flattest possible response.

For EMI immunity, the input stage for a MC head amp will often have capacitance added over and above the capacitance of the cables. A couple of designs I am familiar with have 470pF or even higher.
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

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Follow Ups Full Thread

Topic - Phono preamp and/or step up device - semuta 16:27:18 09/20/16 (6)

To start with,... - Lew 07:13:58 09/21/16 (1)

RE: To start with,... - semuta 10:29:09 09/21/16 (0)

RE: Phono preamp and/or step up device - jeromelang 17:58:29 09/20/16 (2)

RE: Phono preamp and/or step up device - flood2 17:07:14 09/22/16 (0)

RE: Phono preamp and/or step up device - Larry I 05:57:15 09/21/16 (0)

step up device is what you want if you like your Cary's phono section - Smelly_Socks 17:22:41 09/20/16 (0)

Follow Ups

RE: Phono preamp and/or step up device - flood2 17:07:14 09/22/16 (0)

RE: Phono preamp and/or step up device

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