Home » Audio » Thermionic Emissions » Grounded Grid Preamp Breadboarded
Re: Grounded Grid [message #8664 is a reply to message #8661] Sun, 09 January 2005 19:50 Go to previous messageGo to previous message
GarMan is currently offline  GarMan
Messages: 960
Registered: May 2009
Illuminati (2nd Degree)
Hi Poinz,

Sorry, the schematic is not public property, so I can't share it with you. You are correct that a GG circuit has low Zin. In Bruce Rozenblit's design, he uses a cathode follower buffer in front of the grounded grid gain stage to reduce Zin. Not sure if most grounded-grid circuits have high Zout, but this design has a Zout of only 300ohm (have not verify, but going by the book's description). As for gain, this design has a natural gain of 19dB, but total gain is knocked down to 12dB due to the use 7dB of feedback.

Gar.

 
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