[NJARC] How to spot super rare audio tubes

[Billoradio at aol.com]

In a message dated 2/19/2010 10:04:36 A.M. Eastern Standard Time,  
radiomf at comcast.net writes:

Bill  wrote...
I'm 61 now and can still hear the horizontal Osc, sometimes louder  than the
audio from the TV.
Do you have a6DQ6 in that TV. I suspect what  you are hearing is tinnitus:-)
Marty


I hear high frequencies from multiple sources but never ringing that I can  
not identify the source of
 
I have heard big screens scream.
 
In the old days it was traffic light senders, high tension lines, and an  
airport or other place where multiple monitors were was so loud it was very  
uncomfortable.
 
One time i was verified by test equipment following the horiz osc sound to  
3 places it was reflected from till i lost it. The test equipment could 
only  find 3 places it reflected from and verified the order of  reflection.