Quote:
Originally Posted by wa2ise
I have the 1956 Beitman, and the Admiral 20Y4EF, shows the set using a 6BH8 triode as the vert osc, and shows the innards of an integrator 63C9-1 on the circuit board layout, which looks like yours. Diagram says M402.
Looks it should measure about 38K, not 620K. |
Thanks. I thought one of the resistors might be open inside from comparing to other schematics in books of vertical integrators. 620k is way too high.
Can I ask you one more question on this chassis since you have the Beitman's? What voltages and pp are shown on the HO tube grid and screen grid ? I replaced a bad drive trimmer that maxed out at 400 pf (half the stated max value). The new one goes up to over 800pf and it too is maxed out to stop the plate from glowing.Couldn't eliminate it with the other trimmer. Trying to figure out what is amiss that causes me to have to max out the trimmer to just barely get enough drive (if I have enough) instead of getting a drive line like I would expect with a trimmer maxed out.
Sams says -28 on the grid and 80vpp which I get when I got the line voltage set to give me the rated 265v B+ but Sams quotes 145 v for the screen grid. I'm getting more like 185-190v.The screen grid resistors are new. The originals were burnt to a crisp and the 8200 measured way low.