Restoring a RCA 21CT55

[etype2]

Originally Posted by miniman82

I don’t see one in Sams or the white book (service clinic) covering this set, but interestingly Sams list the regulator as a 6BD4 same as the CT-100. White book calls it a 6BK4, wonder if this chassis has the same wiring goof the CT-100 has under the regulator socket?

Can you tell me more about “wonder if this chassis has the same wiring goof the CT-100 has under the regulator socket?[/QUOTE]“ to bring me up to speed.

[benman94]

Originally Posted by etype2

Can you tell me more about “wonder if this chassis has the same wiring goof the CT-100 has under the regulator socket?“ to bring me up to speed.

See this link:

http://www.earlytelevision.org/Deksn..._6BD4-6BK4.htm

In short, pin 8 on the 6BD4 socket in the CT-100 is used as a tie point. It is not used as a tie point in the 21-CT-55, so you can use any 6BD4A, 6BK4, or 6EL4A you choose.