Videokarma.org TV - Video - Vintage Television & Radio Forums

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Videokarma.org TV - Video - Vintage Television & Radio Forums (http://www.videokarma.org/index.php)

- Early Color Television (http://www.videokarma.org/forumdisplay.php?f=36)

- - CTC-5 issue (http://www.videokarma.org/showthread.php?t=267917)

bigaudioal

10-19-2016 01:17 PM

Quote:

Originally Posted by benman94 (Post 3172060)

Al, I think you have a typo.
The shunt reg is a type 6BK4/6EL4. 6BK8 is equivalent to type EF86.
My Hoffman had a screwy 6BK4, acting similar to yours. Replaced it with the last revision (6EL4A maybe?) and that fixed my problem.
Good luck.

Ah crap, you are right. TYPO! 6BK4. Fixed it. Thanks.

bigaudioal

10-19-2016 01:26 PM

Anyone know of a good source that might carry plate caps? Want to replace the cracked one on my 6BK4. I don't have any in my current parts stash. Thanks!

Zenith26kc20

10-19-2016 03:09 PM

Very interesting! When my 25MC233 had a 6BK4 failure high voltage went thru the roof! What is the high voltage on your CTC5? If I remember right they are not capable of ridiculous levels like my 25MC33 (close to 32 KV when the tube died). Sounds like yours went gassy.

bigaudioal

10-19-2016 04:23 PM

Quote:

Originally Posted by Zenith26kc20 (Post 3172071)

The CTC-5 HV is around 20kV at best. One of the complaints everyone has about it. Whereas most of the other vintage color sets are around 25kV.

Hagstar

10-21-2016 07:30 PM

My CTC4 topped out at 22 kV before the flyback fried, with the tripler in place though I now get around 24.

John H.

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