[AMRadio] Sound advice

w5jo at brightok.net w5jo at brightok.net
Mon Aug 22 23:17:02 EDT 2016


If you have an RCA Receiving Tube Manual, I believe there is a simple 
diagram in the back of it that will do what you need.    You will want an 
RC-23 or before.



-----Original Message----- 

I have been wanting to experiment with some of my old mics that basically 
sound pretty bad, either too tinny or too bass, (not the fish) and run them 
through a graphic equalizer.  The motivation for this is that I found a 
really nice single channel, 32 filter unit for a song, but it does not have 
enough sensitivity to handle crystal, dynamic, or controlled magnetic mics, 
giving only minimal indication on the output bar graph at high voice input, 
so I need some ooomph on the head end.  A homebrew 12AX7 amp to fit between 
my various basket case mics and the equalizer is required.  Does anybody 
have experience in this area with some pointers?  Ideas on a solid state 
preamp instead of a tube?  I checked several designs online and the ones in 
the 'Encyclopedia of Electronic Circuits', but maybe somebody here has a 
bullet proof schematic. The DBK2031 equalizer performs as it spec sheet 
advertises, handling inputs and outputs to 40K loads.

Charlie, W4MEC in NC

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