[Amps] Negative feedback passive input tetrode

[RCM]

> On Dec 14, 2017, at 13:04, Fuqua, Bill L <wlfuqu00 at uky.edu> wrote:
> 
>  I just had a thought.
> 
> Has anyone see or used negative feedback to better obtain lower IMD in a passive (resistor terminated) input tetrode amplifier?
> 
>  Any thoughts or references or experience?
> 
> TNX es 73
> 
> Bill Fuqua
> 
> 
> Merry Christmas
> _______________________________________________

What was Collins doing in the 30S1? 

I thought they did the same thing in the 30L1, but don’t see any circuit.

I looked at the ‘S1 manual, and see some transformer on the schematic, but have yet to find a description.