[NJARC] 116X working & smoking!

[Al Klase]

Steve,

The CT of the power xfmr secondary is the most negative end of the power 
supply.  In this case, it's actually "below ground."  So positive end of 
that cap  goes to ground, and negative to the tap.

The other electrolytics, connected to the end of the choke, have their 
negative ends grounded to chassis.

Hummm, my schematic has two #101's.  So I'm not going to use that as a 
reference.

This whole scheme is to provide negative bias to the audio amp grids.  
Don't feel too bad, it's an easy place to mess up.


Al


On 1/17/2013 2:35 PM, sgt88 at atlanticbb.net wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> ...smoking in the REAL sense...
>
> I installed a new 10uf 450v electrolytic on the trans center tap to 
> ground.
>
> Checked it with an ohmmeter...got 1 Meg...seemed good to me.
>
> Was listening on BC band..."warming up" for the contest!
>
> After 1 minute, the top of the cap STREAMED smoke like a 
> volcano!!!...more like the beam radiation from Quasar!!!
>
> The previous one - rated only 160v - didn't pop...just smoked.
>
> The negative lead goes to ground.
>
> What the heck is going on?
>
> Steve T.
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/