Predicta Tandem restoration

[bandersen]

Thanks! Finally time for the first power up.


First a test with the fusistor pulled so no B+. After a little cable wiggling, they lit up.


Now with B+ and a raster appeared


Next with a signal applied. Horizontal sync is impossible to achieve.


Rotating the coarse hold control to one extreme, tweaking the hor. osc. and twiddling the hor. sync finally resulted in a somewhat stable image.


Swapping out a few IF tubes helped, but it still doesn't feel right. The sound is clean but not loud enough, the contrast is poor and the sync touchy. I suspect there's not enough gain somewhere.