RCA 21CT55 #8802897 is Dead

[Kirk]

I have used the Digi Key replacements for the failed white coils- the only difference is that I put them in Series to add up to the desired value using a L-C-R meter. I believe it is the difference in DC resistance that causes the ringing- not the coil itself. By increasing the DC resistance it minimized the undesirable ringing (you can see it on the scope) to be indistinguishable.

Great job winding your own!

Kirk

[Electronic M]

Originally Posted by Kirk

I have used the Digi Key replacements for the failed white coils- the only difference is that I put them in Series to add up to the desired value using a L-C-R meter. I believe it is the difference in DC resistance that causes the ringing- not the coil itself. By increasing the DC resistance it minimized the undesirable ringing (you can see it on the scope) to be indistinguishable.

Great job winding your own!

Kirk

Did you add series resistors or get a large assortment of coils and test them in series with each other until DC resistance and inductance matched target values?