01-08-2017, 02:37 PM
Hi Eric,
Is Cumming cover in snow???
Yes Mike is correct the - side of both filters are connect to the center tap of the HV winding of the power transformer(not the chassis). By connecting them to the chassis you have shorted across R-1 this eliminates the negative bias voltage on the control grid ( grid closest the the cathode) of the 6F6. It need to have about -16 to -25v depending on the plate voltage (sez RCA)
If there is no voltage on C-2 Check the resistance between the two + end of the filter. You may have an open FC or an open R-1.
If you change this wiring error and it doesn't change the AC amps much, pull the rectifier tube and see if the current is much lower.
Is Cumming cover in snow???
Yes Mike is correct the - side of both filters are connect to the center tap of the HV winding of the power transformer(not the chassis). By connecting them to the chassis you have shorted across R-1 this eliminates the negative bias voltage on the control grid ( grid closest the the cathode) of the 6F6. It need to have about -16 to -25v depending on the plate voltage (sez RCA)
If there is no voltage on C-2 Check the resistance between the two + end of the filter. You may have an open FC or an open R-1.
If you change this wiring error and it doesn't change the AC amps much, pull the rectifier tube and see if the current is much lower.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
