Ctc-16

[DaveWM]

thought I would start a new thread now that I know the chassis I have.

this is my 1st early color. when I got it I started a slow power up on a variac (metered). when I saw 1 amp at 10v I knew there was a problem so stopped there.

I disconnected the B+ from the bridge rectifier, powered up again, no problem think it was about .7 amp IIRC all filaments (not the crt the chassis is out on the bench at this point). came up.

B+ was about 400v disconnected. The resistance at the 1st 80uf cap was 24 ohms

I started with the easy stuff the filter caps were in pretty good shape (tested with a cap tester for capacity and leakage at rated voltage).

moving a long I started unwrappping various B+ feeds to thinking maybe a shorted bypass (not likely since mostly dipped caps, only a couple of the HV ceramic tube types and the were ok).

last thing I check (prob wishfull thinking it was not the problem) was a transformer behind the HV cage. I assume it is a vert output, but it also drives the convergence board. Being new to color I am just guessing about this.

anyway it has 5 primary and 6 secondary winding. Two of the primary windings are green and green with yellow strip. the GY connects to the 400v B+, I also disconnected the other G on the primary. doing this removed the 24 ohm reading and now I get 8k

At 1st I thought I had a short in the transformer from the primary to the secondary (there is a lead on the secondary that goes to ground).

but I still need to trace the remaing 3 primary leads (blue/red/yellow) to make sure they are not the problem. I hope to pic up a RCA service folder today to aid it the tracing.