[Amps] YC-156 Triode

[W6RU@aol.com]

In a message dated 9/8/2005 5:56:31 P.M. Pacific Daylight Time,  
lncarman at swbell.net writes:

My  filament transformer didn't have a center-tap
so I improvised a B- by using  an artificial centertap made of diodes
connected
to each leg of the  filament's secondary.


This tube is NOT a directly heated cathode. It has a indirectly  heated 
cathode ... connection to the cathode is the outside heater  connection. This is 
where you connect the B- through a RF choke to the tube. I  found that any other 
B- connection to this tube will induce hum in the  transmitted signal do to 
the AC heater current ending up in series with the  cathode B-.
 
Terry W6RU