Another 630TS On the Bench

[Chris K]

Originally Posted by bandersen

Also common for the 270pF coupling mica caps to go bad. You can leave all the tubes in circuit when injecting.

I have video on the CRT injecting at the plate of the 6AL5 pix 2nd detector. When I inject into the cathode of the same there's no video. I've swapped tubes 3 times and all three test OK. Wiggles don't change anything either.

[Yamamaya42]

Originally Posted by Chris K

I have video on the CRT injecting at the plate of the 6AL5 pix 2nd detector. When I inject into the cathode of the same there's no video. I've swapped tubes 3 times and all three test OK. Wiggles don't change anything either.

To input a signal at the cathode of the defector, you have to match the IF frequency and level it's expecting there. The BK Precision 1077 can do this, but it's a lot more touchy injecting an IF signal than inputting straight video.