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RE: Dual 5AR4 input capacitance

Posted by Eli Duttman (A) on September 17, 2016 at 17:12:33

In Reply to: RE: Dual 5AR4 input capacitance posted by gkargreen on September 17, 2016 at 15:21:25:

Paraphase splitters do have issues. BFD. If the "iron" is decent, tweaking the signal path topology is easy enough.

Look at the schematic. Way more open loop gain is present than that required by modern digital sources. You degrade S/N performance by attenuating the driving signal at the I/Ps.

I suggest you switch to Mullard style circuitry, with an EF86/6267 voltage amplifier and a 12AY7 as the LTP. Please notice that no additional burden is being placed on the power trafo filament winding. Definitely use a 10M45S CCS in the LTP's tail.


Eli D.

• Knight KB85 Schematic   (Open in New Window)

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