• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tube exciter

SY said:
Optical, what you need to do is load a TIFF reader plug-in for your browser. The USPTO sites has links to several freeware readers. Then the image will be accessible, storable, and printable.

I always wondered why the USPTO didn't use Acrobat --

the TIFF reader is fine, however, I most of the time wind up ordering a hard copy -- they usually arrive in about 2 days here in NJ. You have to do this for most of the older patents anyway.
dhaen said:
my exciter has a pretty face and brown eyes:hbeat:
no, that's an osculator !

here's an exciter:


  • exciter.jpg
    27.2 KB · Views: 297
Colt45 said:
i'm rather confused as to what an exciter has to do with audio.

makes it sound nice and full :cool:
well thats the idea anyway, it excites harmonics, result is similar to an eq..

thanks for the info on the TIFF plugin, i didnt know that, i figured it would let you download the file all the same..

jack, do you have a higher res image of the schem? looks interesting...
The expression exciter originates from RF technology where you use nonlinear circuits in order to generate integer multiples of a given frequency. That's what might have caused Colt's confusion.

The AURAL exciter also generates harmonics and lets the operator add those according to taste.

The outcome is quite astounding althogh it is just some sort of psychoacoustic cheating. It is definitely not HIFI if the meaning of this expression is taken seriously.
But it may help to add some warmth. It is best used for single instruments or voices; r the whole mix it should be avoided (depending on what you want to achieve of course).