View Single Post
Old 02-18-2017, 10:16 PM
Hagstar's Avatar
Hagstar Hagstar is offline
VideoKarma Member
Join Date: Jan 2016
Location: Vermont
Posts: 107
Well after months of head scratching and breaks for other projects I finally solved the slow start and AGC issues. I did a full 'lytic recap but I think the starting issue was a cold solder joint or two, fixed a few. After checking everything else replacing the pulse gate transistor brought back AGC voltage even though it seemed to test fine in place (this set is solid state front end, color and sweep all tubes). An NTE123A as OEM however did not last long in circuit- this transistor is where the hybrid part happens- the noise inverter tube provides a static 160 volts across the transistor with 35 volt peak sync pulses so it has a hard life. I swapped it out for a video driver NTE 128 transistor and voila, almost normal picture and proper AGC action.

Last edited by Hagstar; 02-19-2017 at 08:34 AM.
Reply With Quote