1956 RCA CTC-5 is ALIVE!

[Electronic M]

Originally Posted by bigaudioal

CTC-5 was looking great until it blew the horizontal sweep output fuse tonight and I lost HV. Fuse is a .300 amp 250 volt C type. Assuming it is not a slow blow fuse, correct?

Now I am really gonna leave it be until someone more knowledgable than me can run some key diagnostics to make sure the set is running ok. Anything obvious I should look for that may have caused this?

Figures!!! Just got the convergence all set up!

Key with any roundy is to adjust the horizontal linearity/efficiency coil for minimum H output cathode current (it will be a dip) using a 0-250mA or 0-500mA meter in series with the cathode. Should be covered in sam's horizontal adjustment procedure.

It is also wise to look at the H osc. waveform on a scope to make sure it is correct, and check the grid drive of the H output tube before the current dip to ensure the tube is being driven properly.