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RE: 10K and 100K input switch

Posted by Eli Duttman (A) on March 18, 2014 at 18:54:11

In Reply to: 10K and 100K input switch posted by airtime on March 18, 2014 at 07:29:58:

A look at the NAD C275BEE manual suggests that using the variable input sensitivity feature inserts a buffered trim pot. into the signal path.

When the C275BEE is configured for a 100 KOhm I/P impedance, most tube preamps will not be loaded down. However, that alone does not get you out of the woods. If the preamp is located near the power amp, problems are most unlikely. OTOH, if long interconnect cables are used between the preamp and the power amp, the fact that they must be shielded means lots of capacitance to charge and discharge. The circuitry driving the cables needs to be low impedance and high current. I highly prefer hybrid circuitry under that set of circumstances. The only tubes I would accept for a low O/P impedance - high current line stage are the 5687, ECC99, and 6H30П (6n30p). I don't know if a commercial product with the wireless remote feature using 1 of those "super/duper" twin triodes in the line stage exists.


Eli D.

• NAD C275BEE User Manual   (Open in New Window)

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