Audiolabor Rein

[iqpi]

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

 

[johnmath]

In this forum is was measured to be 1.4kΩ, if I read correctly.

Audiolabor "Rein" tönt dumpf im Phono- Eingang, Hifi-Klassiker - HIFI-FORUM

 

[iqpi]

Thanks John,

Yes, that how I read it as well, 1.4kΩ. Looks like I'll have to work with that number.

 

[as_audio]

More than one version of this preamp has been made,
with differences in the phono RIAA stage also.

 

[iqpi]

I have the one with the MM & MC if that helps? Apart from that how do I know which version do I have?

 

[as_audio]

If you are not sure a message to audiolabor.de may be helpful.

 

[iqpi]

Yes, I'll probably have to take the red pill and go straight to the source

 

[iqpi]

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.

 

[as_audio]

See post 4.

 

[johnmath]

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.

 

[as_audio]

The schematic is of the earliest version and may not apply here.