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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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Old 14th September 2021, 07:21 PM   #1
iqpi is offline iqpi  Australia
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Hi all,

I was wondering if anyone knows the input impedance for the MC phono stage of the preamp?

Not too much info about this vintage preamp.

Many thanks,
Aaron
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Old 15th September 2021, 12:00 AM   #2
johnmath is offline johnmath  Australia
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In this forum is was measured to be 1.4kΩ, if I read correctly.

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Old 15th September 2021, 07:23 AM   #3
iqpi is offline iqpi  Australia
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Thanks John,

Yes, that how I read it as well, 1.4kΩ. Looks like I'll have to work with that number.
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Old 15th September 2021, 02:29 PM   #4
as_audio is offline as_audio
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More than one version of this preamp has been made,
with differences in the phono RIAA stage also.
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Old 15th September 2021, 02:32 PM   #5
iqpi is offline iqpi  Australia
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I have the one with the MM & MC if that helps? Apart from that how do I know which version do I have?
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Old 15th September 2021, 02:35 PM   #6
as_audio is offline as_audio
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If you are not sure a message to audiolabor.de may be helpful.

Last edited by as_audio; 15th September 2021 at 02:42 PM.
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Old 15th September 2021, 02:40 PM   #7
iqpi is offline iqpi  Australia
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Yes, I'll probably have to take the red pill and go straight to the source
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Old 15th September 2021, 03:10 PM   #8
iqpi is offline iqpi  Australia
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Looking at the schematic I think both MM & MC share the same phono input (although there are two pairs of RCAs). I will probably need to use impedance/capacitance plugs to match the cartridge and use the gain control to adjust. So I think the default is 47kΩ.
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Last edited by iqpi; 15th September 2021 at 03:11 PM. Reason: add image
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Old 15th September 2021, 03:26 PM   #9
as_audio is offline as_audio
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See post 4.
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Old 15th September 2021, 09:05 PM   #10
johnmath is offline johnmath  Australia
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The notation on the schematic indicates that for MC either 1kΩ or 1k5Ω is paralleled with the 47kΩ input termination used for MM. That would imply an input impedance ~980Ω or ~1k45Ω.
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