[AMPS] YC-156 Cathode/Filament Circuit

measures 2@vc.net
Tue, 1 May 2001 06:11:15 -0700

>Hello List Members,
>First I would like to thank everyone for helping me. Its alot easier for 
>me to explain what I propose to do and have someone correct my mistakes. 
>Here is what I propose to do. Tube YC156. I plan on using a filament 
>choke(without centertap xformer). On the transformer side of the choke I 
>will bypass each side to grnd. On the filament side of the choke I will 
>place a cap across the choke. On the side of the filament thats tied to 
>the cathode is where my drive power will enter thru a coupling cap. The 
>bias choke will attach at the same point. Someone please correct any 
>mistakes that I have made. I have never worked with a tube where one side 
>of the filament was tied to the cathode internally. ...

 I have seen too many kaput 8877s with heater insulation breakdown.  
Connecting cath.-to-heater is the safest way to fly.   Grounding one side 
of the heater is not good engineering practice.  

cheers, Jeff 

-  Rich..., 805.386.3734, www.vcnet.com/measures.  

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