[TMC] GPR-90 Redesign

[Richard Knoppow]

      I discovered from looking at the schematics that the 
RF stages of the GPR-90 were redesigned for the GPR-90RX. 
The original receiver has one stage of grounded-grid 
amplification coupled to a conventional pentode. The 
grounded grid stage is bypassed for the broadcast band.  The 
RX model has two conventional pentode stages on all bands. 
The tube chosen for the first RF is one that has good IMD 
performance and is pretty quiet. I wonder why the GG stage 
was eliminated.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com