01-09-2014, 02:33 PM
Greg
Actually speaking of bias, whether connected to Chassis or to B the centertap will be sufficiently negative towards the cahodes (filaments) as, as you cn see, the filaments connect to the C voltage which is biased towards B using the 1-2 section of the big resistor #26 which is 1.4kOhm. The output tubes being the heaviest drawers will likely self bias enough for the grids to be negative. However you are right to reconnect the centertap to B as this is what is required by the sch.
Which brings up this question: is the mentioned resistor 1.4k as required?
Actually speaking of bias, whether connected to Chassis or to B the centertap will be sufficiently negative towards the cahodes (filaments) as, as you cn see, the filaments connect to the C voltage which is biased towards B using the 1-2 section of the big resistor #26 which is 1.4kOhm. The output tubes being the heaviest drawers will likely self bias enough for the grids to be negative. However you are right to reconnect the centertap to B as this is what is required by the sch.
Which brings up this question: is the mentioned resistor 1.4k as required?
