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  #16  
Old 10-19-2016, 01:17 PM
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bigaudioal bigaudioal is offline
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Quote:
Originally Posted by benman94 View Post
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.
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Last edited by bigaudioal; 10-19-2016 at 01:22 PM.
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  #17  
Old 10-19-2016, 01:26 PM
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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!
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  #18  
Old 10-19-2016, 03:09 PM
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Zenith26kc20 Zenith26kc20 is offline
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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.
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  #19  
Old 10-19-2016, 04:23 PM
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Quote:
Originally Posted by Zenith26kc20 View Post
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.
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.
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  #20  
Old 10-21-2016, 07:30 PM
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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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